[{"publication_identifier":{"issn":["2470-0045"],"eissn":["2470-0053"]},"external_id":{"isi":["000477911800012"],"arxiv":["1907.05860"]},"scopus_import":"1","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","date_updated":"2024-02-28T13:13:00Z","year":"2019","oa_version":"Preprint","article_type":"original","main_file_link":[{"url":"https://arxiv.org/abs/1907.05860","open_access":"1"}],"oa":1,"publication_status":"published","volume":100,"article_processing_charge":"No","issue":"1","arxiv":1,"_id":"6779","date_published":"2019-07-25T00:00:00Z","abstract":[{"lang":"eng","text":"Recent studies suggest that unstable recurrent solutions of the Navier-Stokes equation provide new insights\r\ninto dynamics of turbulent flows. In this study, we compute an extensive network of dynamical connections\r\nbetween such solutions in a weakly turbulent quasi-two-dimensional Kolmogorov flow that lies in the inversion symmetric subspace. In particular, we find numerous isolated heteroclinic connections between different\r\ntypes of solutions—equilibria, periodic, and quasiperiodic orbits—as well as continua of connections forming\r\nhigher-dimensional connecting manifolds. We also compute a homoclinic connection of a periodic orbit and\r\nprovide strong evidence that the associated homoclinic tangle forms the chaotic repeller that underpins transient\r\nturbulence in the symmetric subspace."}],"article_number":"013112","project":[{"name":"International IST Postdoc Fellowship Programme","grant_number":"291734","_id":"25681D80-B435-11E9-9278-68D0E5697425","call_identifier":"FP7"}],"ddc":["532"],"doi":"10.1103/physreve.100.013112","language":[{"iso":"eng"}],"title":"Heteroclinic and homoclinic connections in a Kolmogorov-like flow","citation":{"short":"B. Suri, R.K. Pallantla, M.F. Schatz, R.O. Grigoriev, Physical Review E 100 (2019).","apa":"Suri, B., Pallantla, R. K., Schatz, M. F., &#38; Grigoriev, R. O. (2019). Heteroclinic and homoclinic connections in a Kolmogorov-like flow. <i>Physical Review E</i>. American Physical Society. <a href=\"https://doi.org/10.1103/physreve.100.013112\">https://doi.org/10.1103/physreve.100.013112</a>","ama":"Suri B, Pallantla RK, Schatz MF, Grigoriev RO. Heteroclinic and homoclinic connections in a Kolmogorov-like flow. <i>Physical Review E</i>. 2019;100(1). doi:<a href=\"https://doi.org/10.1103/physreve.100.013112\">10.1103/physreve.100.013112</a>","ista":"Suri B, Pallantla RK, Schatz MF, Grigoriev RO. 2019. Heteroclinic and homoclinic connections in a Kolmogorov-like flow. Physical Review E. 100(1), 013112.","ieee":"B. Suri, R. K. Pallantla, M. F. Schatz, and R. O. Grigoriev, “Heteroclinic and homoclinic connections in a Kolmogorov-like flow,” <i>Physical Review E</i>, vol. 100, no. 1. American Physical Society, 2019.","chicago":"Suri, Balachandra, Ravi Kumar Pallantla, Michael F. Schatz, and Roman O. Grigoriev. “Heteroclinic and Homoclinic Connections in a Kolmogorov-like Flow.” <i>Physical Review E</i>. American Physical Society, 2019. <a href=\"https://doi.org/10.1103/physreve.100.013112\">https://doi.org/10.1103/physreve.100.013112</a>.","mla":"Suri, Balachandra, et al. “Heteroclinic and Homoclinic Connections in a Kolmogorov-like Flow.” <i>Physical Review E</i>, vol. 100, no. 1, 013112, American Physical Society, 2019, doi:<a href=\"https://doi.org/10.1103/physreve.100.013112\">10.1103/physreve.100.013112</a>."},"ec_funded":1,"author":[{"first_name":"Balachandra","full_name":"Suri, Balachandra","last_name":"Suri","id":"47A5E706-F248-11E8-B48F-1D18A9856A87"},{"last_name":"Pallantla","full_name":"Pallantla, Ravi Kumar","first_name":"Ravi Kumar"},{"last_name":"Schatz","full_name":"Schatz, Michael F.","first_name":"Michael F."},{"last_name":"Grigoriev","first_name":"Roman O.","full_name":"Grigoriev, Roman O."}],"type":"journal_article","day":"25","isi":1,"publisher":"American Physical Society","intvolume":"       100","status":"public","publication":"Physical Review E","quality_controlled":"1","department":[{"_id":"BjHo"}],"date_created":"2019-08-09T09:40:41Z","month":"07"},{"page":"138","month":"10","supervisor":[{"last_name":"Hof","first_name":"Björn","full_name":"Hof, Björn","orcid":"0000-0003-2057-2754","id":"3A374330-F248-11E8-B48F-1D18A9856A87"}],"date_created":"2019-10-22T12:08:43Z","publisher":"Institute of Science and Technology Austria","degree_awarded":"PhD","department":[{"_id":"BjHo"}],"status":"public","citation":{"apa":"Paranjape, C. S. (2019). <i>Onset of turbulence in plane Poiseuille flow</i>. Institute of Science and Technology Austria. <a href=\"https://doi.org/10.15479/AT:ISTA:6957\">https://doi.org/10.15479/AT:ISTA:6957</a>","ama":"Paranjape CS. Onset of turbulence in plane Poiseuille flow. 2019. doi:<a href=\"https://doi.org/10.15479/AT:ISTA:6957\">10.15479/AT:ISTA:6957</a>","short":"C.S. Paranjape, Onset of Turbulence in Plane Poiseuille Flow, Institute of Science and Technology Austria, 2019.","mla":"Paranjape, Chaitanya S. <i>Onset of Turbulence in Plane Poiseuille Flow</i>. Institute of Science and Technology Austria, 2019, doi:<a href=\"https://doi.org/10.15479/AT:ISTA:6957\">10.15479/AT:ISTA:6957</a>.","ieee":"C. S. Paranjape, “Onset of turbulence in plane Poiseuille flow,” Institute of Science and Technology Austria, 2019.","ista":"Paranjape CS. 2019. Onset of turbulence in plane Poiseuille flow. Institute of Science and Technology Austria.","chicago":"Paranjape, Chaitanya S. “Onset of Turbulence in Plane Poiseuille Flow.” Institute of Science and Technology Austria, 2019. <a href=\"https://doi.org/10.15479/AT:ISTA:6957\">https://doi.org/10.15479/AT:ISTA:6957</a>."},"title":"Onset of turbulence in plane Poiseuille flow","day":"24","type":"dissertation","author":[{"id":"3D85B7C4-F248-11E8-B48F-1D18A9856A87","first_name":"Chaitanya S","full_name":"Paranjape, Chaitanya S","last_name":"Paranjape"}],"alternative_title":["ISTA Thesis"],"keyword":["Instabilities","Turbulence","Nonlinear dynamics"],"language":[{"iso":"eng"}],"doi":"10.15479/AT:ISTA:6957","ddc":["532"],"article_processing_charge":"No","file":[{"date_created":"2019-10-23T09:54:43Z","file_id":"6962","relation":"source_file","content_type":"application/zip","access_level":"closed","date_updated":"2020-07-14T12:47:46Z","checksum":"7ba298ba0ce7e1d11691af6b8eaf0a0a","file_size":45828099,"creator":"cparanjape","file_name":"Chaitanya_Paranjape_source_files_tex_figures.zip"},{"checksum":"642697618314e31ac31392da7909c2d9","date_updated":"2020-07-14T12:47:46Z","access_level":"open_access","file_name":"Chaitanya_Paranjape_Thesis.pdf","creator":"cparanjape","file_size":19504197,"date_created":"2019-10-23T10:37:09Z","content_type":"application/pdf","file_id":"6963","relation":"main_file"}],"_id":"6957","abstract":[{"text":"In many shear flows like pipe flow, plane Couette flow, plane Poiseuille flow,  etc. turbulence emerges subcritically. Here, when subjected to strong enough perturbations, the flow becomes turbulent in spite of the laminar base flow being linearly stable.  The nature of this instability has puzzled the scientific community for decades. At onset, turbulence appears in localized patches and flows are spatio-temporally intermittent.  In pipe flow the localized turbulent structures are referred to as puffs and in planar flows like plane Couette and channel flow, patches arise in the form of localized oblique bands. In this thesis, we study the onset of turbulence in channel flow in direct numerical simulations from a dynamical system theory perspective, as well as by performing experiments in a large aspect ratio channel.\r\n\r\nThe aim of the experimental work is to determine the critical Reynolds number where turbulence first becomes sustained. Recently, the onset of turbulence has been described in analogy to absorbing state phase transition (i.e. directed percolation). In particular, it has been shown that the critical point can be estimated from the competition between spreading and decay processes. Here, by performing experiments, we identify the mechanisms underlying turbulence proliferation in channel flow and find the critical Reynolds number, above which turbulence becomes sustained. Above the critical point, the continuous growth at the tip of the stripes outweighs the stochastic shedding of turbulent patches at the tail and the stripes expand. For growing stripes, the probability to decay decreases while the probability of stripe splitting increases. Consequently, and unlike for the puffs in pipe flow, neither of these two processes is time-independent i.e. memoryless. Coupling between stripe expansion and creation of new stripes via splitting leads to a significantly lower critical point ($Re_c=670+/-10$) than most earlier studies suggest.  \r\n\r\nWhile the above approach sheds light on how turbulence first becomes sustained, it provides no insight into the origin of the stripes themselves. In the numerical part of the thesis we investigate how turbulent stripes form from invariant solutions of the Navier-Stokes equations. The origin of these turbulent stripes can be identified by applying concepts from the dynamical system theory. In doing so, we identify the exact coherent structures underlying stripes and their bifurcations and how they give rise to the turbulent attractor in phase space. We first report a family of localized nonlinear traveling wave solutions of the Navier-Stokes equations in channel flow. These solutions show structural similarities with turbulent stripes in experiments like obliqueness, quasi-streamwise streaks and vortices, etc. A parametric study of these traveling wave solution is performed, with parameters like Reynolds number, stripe tilt angle and domain size, including the stability of the solutions. These solutions emerge through saddle-node bifurcations and form a phase space skeleton for the turbulent stripes observed in the experiments. The lower branches of these TW solutions at different tilt angles undergo Hopf bifurcation and new solutions branches of relative periodic orbits emerge. These RPO solutions do not belong to the same family and therefore the routes to chaos for different angles are different.  \r\n\r\nIn shear flows, turbulence at onset is transient in nature.  Consequently,turbulence can not be tracked to lower Reynolds numbers, where the dynamics may simplify. Before this happens, turbulence becomes short-lived and laminarizes. In the last part of the thesis, we show that using numerical simulations we can continue turbulent stripes in channel flow past the 'relaminarization barrier' all the way to their origin. Here, turbulent stripe dynamics simplifies and the fluctuations are no longer stochastic and the stripe settles down to a relative periodic orbit. This relative periodic orbit originates from the aforementioned traveling wave solutions. Starting from the relative periodic orbit, a small increase in speed i.e. Reynolds number gives rise to chaos and the attractor dimension sharply increases in contrast to the classical transition scenario where the instabilities affect the flow globally and give rise to much more gradual route to turbulence.","lang":"eng"}],"date_published":"2019-10-24T00:00:00Z","publication_status":"published","oa":1,"file_date_updated":"2020-07-14T12:47:46Z","year":"2019","oa_version":"Published Version","has_accepted_license":"1","user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","date_updated":"2023-09-07T12:53:25Z","publication_identifier":{"eissn":["2663-337X"]}},{"external_id":{"isi":["000493510400001"],"arxiv":["1810.02211"]},"scopus_import":"1","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","date_updated":"2023-08-30T07:20:03Z","acknowledged_ssus":[{"_id":"ScienComp"}],"article_type":"original","year":"2019","oa_version":"Preprint","publication_status":"published","main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/1810.02211"}],"oa":1,"volume":4,"arxiv":1,"article_processing_charge":"No","issue":"10","date_published":"2019-10-01T00:00:00Z","_id":"6978","abstract":[{"text":"In  pipes  and  channels,  the  onset  of  turbulence  is  initially  dominated  by  localizedtransients,  which  lead  to  sustained  turbulence  through  their  collective  dynamics.  In  thepresent work, we study numerically the localized turbulence in pipe flow and elucidate astate space structure that gives rise to transient chaos. Starting from the basin boundaryseparating  laminar  and  turbulent  flow,  we  identify  transverse  homoclinic  orbits,  thepresence of which necessitates a homoclinic tangle and chaos. A direct consequence ofthe homoclinic tangle is the fractal nature of the laminar-turbulent boundary, which wasconjectured in various earlier studies. By mapping the transverse intersections between thestable and unstable manifold of a periodic orbit, we identify the gateways that promote anescape from turbulence.","lang":"eng"}],"language":[{"iso":"eng"}],"doi":"10.1103/PhysRevFluids.4.102401","citation":{"mla":"Budanur, Nazmi B., et al. “Geometry of Transient Chaos in Streamwise-Localized Pipe Flow Turbulence.” <i>Physical Review Fluids</i>, vol. 4, no. 10, American Physical Society, 2019, p. 102401, doi:<a href=\"https://doi.org/10.1103/PhysRevFluids.4.102401\">10.1103/PhysRevFluids.4.102401</a>.","ista":"Budanur NB, Dogra A, Hof B. 2019. Geometry of transient chaos in streamwise-localized pipe flow turbulence. Physical Review Fluids. 4(10), 102401.","ieee":"N. B. Budanur, A. Dogra, and B. Hof, “Geometry of transient chaos in streamwise-localized pipe flow turbulence,” <i>Physical Review Fluids</i>, vol. 4, no. 10. American Physical Society, p. 102401, 2019.","chicago":"Budanur, Nazmi B, Akshunna Dogra, and Björn Hof. “Geometry of Transient Chaos in Streamwise-Localized Pipe Flow Turbulence.” <i>Physical Review Fluids</i>. American Physical Society, 2019. <a href=\"https://doi.org/10.1103/PhysRevFluids.4.102401\">https://doi.org/10.1103/PhysRevFluids.4.102401</a>.","apa":"Budanur, N. B., Dogra, A., &#38; Hof, B. (2019). Geometry of transient chaos in streamwise-localized pipe flow turbulence. <i>Physical Review Fluids</i>. American Physical Society. <a href=\"https://doi.org/10.1103/PhysRevFluids.4.102401\">https://doi.org/10.1103/PhysRevFluids.4.102401</a>","ama":"Budanur NB, Dogra A, Hof B. Geometry of transient chaos in streamwise-localized pipe flow turbulence. <i>Physical Review Fluids</i>. 2019;4(10):102401. doi:<a href=\"https://doi.org/10.1103/PhysRevFluids.4.102401\">10.1103/PhysRevFluids.4.102401</a>","short":"N.B. Budanur, A. Dogra, B. Hof, Physical Review Fluids 4 (2019) 102401."},"title":"Geometry of transient chaos in streamwise-localized pipe flow turbulence","day":"01","author":[{"id":"3EA1010E-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0003-0423-5010","full_name":"Budanur, Nazmi B","first_name":"Nazmi B","last_name":"Budanur"},{"last_name":"Dogra","first_name":"Akshunna","full_name":"Dogra, Akshunna"},{"full_name":"Hof, Björn","first_name":"Björn","last_name":"Hof","id":"3A374330-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0003-2057-2754"}],"type":"journal_article","publisher":"American Physical Society","isi":1,"publication":"Physical Review Fluids","quality_controlled":"1","department":[{"_id":"BjHo"}],"intvolume":"         4","status":"public","page":"102401","month":"10","date_created":"2019-11-04T10:04:01Z"},{"_id":"7001","date_published":"2019-10-31T00:00:00Z","file":[{"success":1,"date_created":"2020-10-21T07:09:45Z","content_type":"application/pdf","file_id":"8684","relation":"main_file","date_updated":"2020-10-21T07:09:45Z","access_level":"open_access","checksum":"33dac4bb77ee630e2666e936b4d57980","file_name":"2019_Cell_Schwayer_accepted.pdf","creator":"dernst","file_size":8805878}],"article_processing_charge":"No","issue":"4","volume":179,"file_date_updated":"2020-10-21T07:09:45Z","oa":1,"publication_status":"published","has_accepted_license":"1","year":"2019","oa_version":"Submitted Version","article_type":"original","publication_identifier":{"issn":["0092-8674"],"eissn":["1097-4172"]},"acknowledged_ssus":[{"_id":"PreCl"},{"_id":"Bio"}],"external_id":{"isi":["000493898000012"],"pmid":["31675500"]},"scopus_import":"1","date_updated":"2024-03-25T23:30:21Z","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","date_created":"2019-11-12T12:51:06Z","month":"10","page":"937-952.e18","intvolume":"       179","status":"public","publication":"Cell","quality_controlled":"1","department":[{"_id":"CaHe"},{"_id":"BjHo"}],"isi":1,"publisher":"Cell Press","author":[{"last_name":"Schwayer","first_name":"Cornelia","full_name":"Schwayer, Cornelia","orcid":"0000-0001-5130-2226","id":"3436488C-F248-11E8-B48F-1D18A9856A87"},{"id":"40B34FE2-F248-11E8-B48F-1D18A9856A87","full_name":"Shamipour, Shayan","first_name":"Shayan","last_name":"Shamipour"},{"id":"4362B3C2-F248-11E8-B48F-1D18A9856A87","full_name":"Pranjic-Ferscha, Kornelija","first_name":"Kornelija","last_name":"Pranjic-Ferscha"},{"id":"30A536BA-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-7659-9142","last_name":"Schauer","first_name":"Alexandra","full_name":"Schauer, Alexandra"},{"last_name":"Balda","full_name":"Balda, M","first_name":"M"},{"full_name":"Tada, M","first_name":"M","last_name":"Tada"},{"first_name":"K","full_name":"Matter, K","last_name":"Matter"},{"last_name":"Heisenberg","full_name":"Heisenberg, Carl-Philipp J","first_name":"Carl-Philipp J","orcid":"0000-0002-0912-4566","id":"39427864-F248-11E8-B48F-1D18A9856A87"}],"type":"journal_article","day":"31","title":"Mechanosensation of tight junctions depends on ZO-1 phase separation and flow","citation":{"ieee":"C. Schwayer <i>et al.</i>, “Mechanosensation of tight junctions depends on ZO-1 phase separation and flow,” <i>Cell</i>, vol. 179, no. 4. Cell Press, p. 937–952.e18, 2019.","ista":"Schwayer C, Shamipour S, Pranjic-Ferscha K, Schauer A, Balda M, Tada M, Matter K, Heisenberg C-PJ. 2019. Mechanosensation of tight junctions depends on ZO-1 phase separation and flow. Cell. 179(4), 937–952.e18.","chicago":"Schwayer, Cornelia, Shayan Shamipour, Kornelija Pranjic-Ferscha, Alexandra Schauer, M Balda, M Tada, K Matter, and Carl-Philipp J Heisenberg. “Mechanosensation of Tight Junctions Depends on ZO-1 Phase Separation and Flow.” <i>Cell</i>. Cell Press, 2019. <a href=\"https://doi.org/10.1016/j.cell.2019.10.006\">https://doi.org/10.1016/j.cell.2019.10.006</a>.","mla":"Schwayer, Cornelia, et al. “Mechanosensation of Tight Junctions Depends on ZO-1 Phase Separation and Flow.” <i>Cell</i>, vol. 179, no. 4, Cell Press, 2019, p. 937–952.e18, doi:<a href=\"https://doi.org/10.1016/j.cell.2019.10.006\">10.1016/j.cell.2019.10.006</a>.","short":"C. Schwayer, S. Shamipour, K. Pranjic-Ferscha, A. Schauer, M. Balda, M. Tada, K. Matter, C.-P.J. Heisenberg, Cell 179 (2019) 937–952.e18.","apa":"Schwayer, C., Shamipour, S., Pranjic-Ferscha, K., Schauer, A., Balda, M., Tada, M., … Heisenberg, C.-P. J. (2019). Mechanosensation of tight junctions depends on ZO-1 phase separation and flow. <i>Cell</i>. Cell Press. <a href=\"https://doi.org/10.1016/j.cell.2019.10.006\">https://doi.org/10.1016/j.cell.2019.10.006</a>","ama":"Schwayer C, Shamipour S, Pranjic-Ferscha K, et al. Mechanosensation of tight junctions depends on ZO-1 phase separation and flow. <i>Cell</i>. 2019;179(4):937-952.e18. doi:<a href=\"https://doi.org/10.1016/j.cell.2019.10.006\">10.1016/j.cell.2019.10.006</a>"},"ec_funded":1,"ddc":["570"],"doi":"10.1016/j.cell.2019.10.006","language":[{"iso":"eng"}],"project":[{"grant_number":"742573","name":"Interaction and feedback between cell mechanics and fate specification in vertebrate gastrulation","_id":"260F1432-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"}],"pmid":1,"related_material":{"link":[{"description":"News auf IST Website","url":"https://ist.ac.at/en/news/biochemistry-meets-mechanics-the-sensitive-nature-of-cell-cell-contact-formation-in-embryo-development/","relation":"press_release"}],"record":[{"id":"7186","relation":"dissertation_contains","status":"public"},{"status":"public","id":"8350","relation":"dissertation_contains"}]}},{"year":"2019","has_accepted_license":"1","oa_version":"Published Version","article_type":"original","acknowledged_ssus":[{"_id":"LifeSc"},{"_id":"Bio"}],"publication_identifier":{"issn":["2041-1723"]},"external_id":{"isi":["000503009300001"]},"scopus_import":"1","user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","date_updated":"2023-09-07T13:18:51Z","article_processing_charge":"No","_id":"7197","abstract":[{"text":"During bacterial cell division, the tubulin-homolog FtsZ forms a ring-like structure at the center of the cell. This Z-ring not only organizes the division machinery, but treadmilling of FtsZ filaments was also found to play a key role in distributing proteins at the division site. What regulates the architecture, dynamics and stability of the Z-ring is currently unknown, but FtsZ-associated proteins are known to play an important role. Here, using an in vitro reconstitution approach, we studied how the well-conserved protein ZapA affects FtsZ treadmilling and filament organization into large-scale patterns. Using high-resolution fluorescence microscopy and quantitative image analysis, we found that ZapA cooperatively increases the spatial order of the filament network, but binds only transiently to FtsZ filaments and has no effect on filament length and treadmilling velocity. Together, our data provides a model for how FtsZ-associated proteins can increase the precision and stability of the bacterial cell division machinery in a switch-like manner.","lang":"eng"}],"date_published":"2019-12-17T00:00:00Z","article_number":"5744","file":[{"content_type":"application/pdf","relation":"main_file","file_id":"7208","date_created":"2019-12-23T07:34:56Z","file_name":"2019_NatureComm_Caldas.pdf","file_size":8488733,"creator":"dernst","date_updated":"2020-07-14T12:47:53Z","access_level":"open_access","checksum":"a1b44b427ba341383197790d0e8789fa"}],"oa":1,"publication_status":"published","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","image":"/images/cc_by.png","short":"CC BY (4.0)"},"volume":10,"file_date_updated":"2020-07-14T12:47:53Z","title":"Cooperative ordering of treadmilling filaments in cytoskeletal networks of FtsZ and its crosslinker ZapA","citation":{"mla":"Dos Santos Caldas, Paulo R., et al. “Cooperative Ordering of Treadmilling Filaments in Cytoskeletal Networks of FtsZ and Its Crosslinker ZapA.” <i>Nature Communications</i>, vol. 10, 5744, Springer Nature, 2019, doi:<a href=\"https://doi.org/10.1038/s41467-019-13702-4\">10.1038/s41467-019-13702-4</a>.","ieee":"P. R. Dos Santos Caldas, M. D. Lopez Pelegrin, D. J. G. Pearce, N. B. Budanur, J. Brugués, and M. Loose, “Cooperative ordering of treadmilling filaments in cytoskeletal networks of FtsZ and its crosslinker ZapA,” <i>Nature Communications</i>, vol. 10. Springer Nature, 2019.","ista":"Dos Santos Caldas PR, Lopez Pelegrin MD, Pearce DJG, Budanur NB, Brugués J, Loose M. 2019. Cooperative ordering of treadmilling filaments in cytoskeletal networks of FtsZ and its crosslinker ZapA. Nature Communications. 10, 5744.","chicago":"Dos Santos Caldas, Paulo R, Maria D Lopez Pelegrin, Daniel J. G. Pearce, Nazmi B Budanur, Jan Brugués, and Martin Loose. “Cooperative Ordering of Treadmilling Filaments in Cytoskeletal Networks of FtsZ and Its Crosslinker ZapA.” <i>Nature Communications</i>. Springer Nature, 2019. <a href=\"https://doi.org/10.1038/s41467-019-13702-4\">https://doi.org/10.1038/s41467-019-13702-4</a>.","apa":"Dos Santos Caldas, P. R., Lopez Pelegrin, M. D., Pearce, D. J. G., Budanur, N. B., Brugués, J., &#38; Loose, M. (2019). Cooperative ordering of treadmilling filaments in cytoskeletal networks of FtsZ and its crosslinker ZapA. <i>Nature Communications</i>. Springer Nature. <a href=\"https://doi.org/10.1038/s41467-019-13702-4\">https://doi.org/10.1038/s41467-019-13702-4</a>","ama":"Dos Santos Caldas PR, Lopez Pelegrin MD, Pearce DJG, Budanur NB, Brugués J, Loose M. Cooperative ordering of treadmilling filaments in cytoskeletal networks of FtsZ and its crosslinker ZapA. <i>Nature Communications</i>. 2019;10. doi:<a href=\"https://doi.org/10.1038/s41467-019-13702-4\">10.1038/s41467-019-13702-4</a>","short":"P.R. Dos Santos Caldas, M.D. Lopez Pelegrin, D.J.G. Pearce, N.B. Budanur, J. Brugués, M. Loose, Nature Communications 10 (2019)."},"ec_funded":1,"type":"journal_article","author":[{"full_name":"Dos Santos Caldas, Paulo R","first_name":"Paulo R","last_name":"Dos Santos Caldas","orcid":"0000-0001-6730-4461","id":"38FCDB4C-F248-11E8-B48F-1D18A9856A87"},{"id":"319AA9CE-F248-11E8-B48F-1D18A9856A87","last_name":"Lopez Pelegrin","first_name":"Maria D","full_name":"Lopez Pelegrin, Maria D"},{"first_name":"Daniel J. G.","full_name":"Pearce, Daniel J. G.","last_name":"Pearce"},{"first_name":"Nazmi B","full_name":"Budanur, Nazmi B","last_name":"Budanur","orcid":"0000-0003-0423-5010","id":"3EA1010E-F248-11E8-B48F-1D18A9856A87"},{"last_name":"Brugués","full_name":"Brugués, Jan","first_name":"Jan"},{"orcid":"0000-0001-7309-9724","id":"462D4284-F248-11E8-B48F-1D18A9856A87","first_name":"Martin","full_name":"Loose, Martin","last_name":"Loose"}],"day":"17","project":[{"grant_number":"679239","name":"Self-Organization of the Bacterial Cell","_id":"2595697A-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"},{"name":"Reconstitution of Bacterial Cell Division Using Purified Components","_id":"260D98C8-B435-11E9-9278-68D0E5697425"}],"related_material":{"record":[{"status":"public","id":"8358","relation":"dissertation_contains"}]},"ddc":["570"],"doi":"10.1038/s41467-019-13702-4","language":[{"iso":"eng"}],"date_created":"2019-12-20T12:22:57Z","month":"12","isi":1,"publisher":"Springer Nature","intvolume":"        10","status":"public","publication":"Nature Communications","quality_controlled":"1","department":[{"_id":"MaLo"},{"_id":"BjHo"}]},{"isi":1,"publisher":"CUP","intvolume":"       874","status":"public","publication":"Journal of Fluid Mechanics","quality_controlled":"1","department":[{"_id":"BjHo"}],"page":"699-719","date_created":"2020-01-29T16:05:19Z","month":"09","doi":"10.1017/jfm.2019.486","language":[{"iso":"eng"}],"title":"Dynamics of viscoelastic pipe flow at low Reynolds numbers in the maximum drag reduction limit","citation":{"ista":"Lopez Alonso JM, Choueiri GH, Hof B. 2019. Dynamics of viscoelastic pipe flow at low Reynolds numbers in the maximum drag reduction limit. Journal of Fluid Mechanics. 874, 699–719.","ieee":"J. M. Lopez Alonso, G. H. Choueiri, and B. Hof, “Dynamics of viscoelastic pipe flow at low Reynolds numbers in the maximum drag reduction limit,” <i>Journal of Fluid Mechanics</i>, vol. 874. CUP, pp. 699–719, 2019.","chicago":"Lopez Alonso, Jose M, George H Choueiri, and Björn Hof. “Dynamics of Viscoelastic Pipe Flow at Low Reynolds Numbers in the Maximum Drag Reduction Limit.” <i>Journal of Fluid Mechanics</i>. CUP, 2019. <a href=\"https://doi.org/10.1017/jfm.2019.486\">https://doi.org/10.1017/jfm.2019.486</a>.","mla":"Lopez Alonso, Jose M., et al. “Dynamics of Viscoelastic Pipe Flow at Low Reynolds Numbers in the Maximum Drag Reduction Limit.” <i>Journal of Fluid Mechanics</i>, vol. 874, CUP, 2019, pp. 699–719, doi:<a href=\"https://doi.org/10.1017/jfm.2019.486\">10.1017/jfm.2019.486</a>.","short":"J.M. Lopez Alonso, G.H. Choueiri, B. Hof, Journal of Fluid Mechanics 874 (2019) 699–719.","apa":"Lopez Alonso, J. M., Choueiri, G. H., &#38; Hof, B. (2019). Dynamics of viscoelastic pipe flow at low Reynolds numbers in the maximum drag reduction limit. <i>Journal of Fluid Mechanics</i>. CUP. <a href=\"https://doi.org/10.1017/jfm.2019.486\">https://doi.org/10.1017/jfm.2019.486</a>","ama":"Lopez Alonso JM, Choueiri GH, Hof B. Dynamics of viscoelastic pipe flow at low Reynolds numbers in the maximum drag reduction limit. <i>Journal of Fluid Mechanics</i>. 2019;874:699-719. doi:<a href=\"https://doi.org/10.1017/jfm.2019.486\">10.1017/jfm.2019.486</a>"},"type":"journal_article","author":[{"id":"40770848-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-0384-2022","last_name":"Lopez Alonso","first_name":"Jose M","full_name":"Lopez Alonso, Jose M"},{"id":"448BD5BC-F248-11E8-B48F-1D18A9856A87","first_name":"George H","full_name":"Choueiri, George H","last_name":"Choueiri"},{"first_name":"Björn","full_name":"Hof, Björn","last_name":"Hof","id":"3A374330-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0003-2057-2754"}],"day":"10","main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/1808.04080"}],"oa":1,"publication_status":"published","volume":874,"article_processing_charge":"No","arxiv":1,"abstract":[{"text":"Polymer additives can substantially reduce the drag of turbulent flows and the upperlimit, the so called “maximum drag reduction” (MDR) asymptote is universal, i.e. inde-pendent of the type of polymer and solvent used. Until recently, the consensus was that,in this limit, flows are in a marginal state where only a minimal level of turbulence activ-ity persists. Observations in direct numerical simulations using minimal sized channelsappeared  to  support  this  view  and  reported  long  “hibernation”  periods  where  turbu-lence is marginalized. In simulations of pipe flow we find that, indeed, with increasingWeissenberg number (Wi), turbulence expresses long periods of hibernation if the domainsize is small. However, with increasing pipe length, the temporal hibernation continuouslyalters to spatio-temporal intermittency and here the flow consists of turbulent puffs sur-rounded by laminar flow. Moreover, upon an increase in Wi, the flow fully relaminarises,in agreement with recent experiments. At even larger Wi, a different instability is en-countered causing a drag increase towards MDR. Our findings hence link earlier minimalflow unit simulations with recent experiments and confirm that the addition of polymersinitially suppresses Newtonian turbulence and leads to a reverse transition. The MDRstate on the other hand results from a separate instability and the underlying dynamicscorresponds to the recently proposed state of elasto-inertial-turbulence (EIT).","lang":"eng"}],"_id":"7397","date_published":"2019-09-10T00:00:00Z","publication_identifier":{"issn":["0022-1120"],"eissn":["1469-7645"]},"external_id":{"isi":["000475349900001"],"arxiv":["1808.04080"]},"scopus_import":"1","date_updated":"2023-09-06T15:36:36Z","user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","oa_version":"Preprint","year":"2019","article_type":"original"},{"article_number":"013122","_id":"5878","abstract":[{"text":"We consider the motion of a droplet bouncing on a vibrating bath of the same fluid in the presence of a central potential. We formulate a rotation symmetry-reduced description of this system, which allows for the straightforward application of dynamical systems theory tools. As an illustration of the utility of the symmetry reduction, we apply it to a model of the pilot-wave system with a central harmonic force. We begin our analysis by identifying local bifurcations and the onset of chaos. We then describe the emergence of chaotic regions and their merging bifurcations, which lead to the formation of a global attractor. In this final regime, the droplet’s angular momentum spontaneously changes its sign as observed in the experiments of Perrard et al.","lang":"eng"}],"date_published":"2019-01-22T00:00:00Z","arxiv":1,"article_processing_charge":"No","issue":"1","volume":29,"publication_status":"published","main_file_link":[{"url":"https://arxiv.org/abs/1812.09011","open_access":"1"}],"oa":1,"article_type":"original","oa_version":"Preprint","year":"2019","external_id":{"isi":["000457409100028"],"arxiv":["1812.09011"]},"scopus_import":"1","date_updated":"2023-08-25T10:16:11Z","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","publication_identifier":{"eissn":["1089-7682"],"issn":["1054-1500"]},"month":"01","date_created":"2019-01-23T08:35:09Z","publication":"Chaos: An Interdisciplinary Journal of Nonlinear Science","department":[{"_id":"BjHo"}],"quality_controlled":"1","intvolume":"        29","status":"public","publisher":"AIP Publishing","isi":1,"day":"22","author":[{"full_name":"Budanur, Nazmi B","first_name":"Nazmi B","last_name":"Budanur","id":"3EA1010E-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0003-0423-5010"},{"first_name":"Marc","full_name":"Fleury, Marc","last_name":"Fleury"}],"type":"journal_article","citation":{"ama":"Budanur NB, Fleury M. State space geometry of the chaotic pilot-wave hydrodynamics. <i>Chaos: An Interdisciplinary Journal of Nonlinear Science</i>. 2019;29(1). doi:<a href=\"https://doi.org/10.1063/1.5058279\">10.1063/1.5058279</a>","apa":"Budanur, N. B., &#38; Fleury, M. (2019). State space geometry of the chaotic pilot-wave hydrodynamics. <i>Chaos: An Interdisciplinary Journal of Nonlinear Science</i>. AIP Publishing. <a href=\"https://doi.org/10.1063/1.5058279\">https://doi.org/10.1063/1.5058279</a>","short":"N.B. Budanur, M. Fleury, Chaos: An Interdisciplinary Journal of Nonlinear Science 29 (2019).","mla":"Budanur, Nazmi B., and Marc Fleury. “State Space Geometry of the Chaotic Pilot-Wave Hydrodynamics.” <i>Chaos: An Interdisciplinary Journal of Nonlinear Science</i>, vol. 29, no. 1, 013122, AIP Publishing, 2019, doi:<a href=\"https://doi.org/10.1063/1.5058279\">10.1063/1.5058279</a>.","chicago":"Budanur, Nazmi B, and Marc Fleury. “State Space Geometry of the Chaotic Pilot-Wave Hydrodynamics.” <i>Chaos: An Interdisciplinary Journal of Nonlinear Science</i>. AIP Publishing, 2019. <a href=\"https://doi.org/10.1063/1.5058279\">https://doi.org/10.1063/1.5058279</a>.","ista":"Budanur NB, Fleury M. 2019. State space geometry of the chaotic pilot-wave hydrodynamics. Chaos: An Interdisciplinary Journal of Nonlinear Science. 29(1), 013122.","ieee":"N. B. Budanur and M. Fleury, “State space geometry of the chaotic pilot-wave hydrodynamics,” <i>Chaos: An Interdisciplinary Journal of Nonlinear Science</i>, vol. 29, no. 1. AIP Publishing, 2019."},"title":"State space geometry of the chaotic pilot-wave hydrodynamics","language":[{"iso":"eng"}],"doi":"10.1063/1.5058279","related_material":{"link":[{"relation":"erratum","url":"https://aip.scitation.org/doi/abs/10.1063/1.5097157"}]}},{"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","date_updated":"2023-08-24T14:43:13Z","scopus_import":"1","external_id":{"isi":["000526029100016"],"arxiv":["1902.07931"]},"oa_version":"Preprint","year":"2019","article_type":"original","volume":863,"oa":1,"main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/1902.07931"}],"publication_status":"published","_id":"5943","abstract":[{"text":"The hairpin instability of a jet in a crossflow (JICF) for a low jet-to-crossflow velocity ratio is investigated experimentally for a velocity ratio range of R ∈ (0.14, 0.75) and crossflow Reynolds numbers ReD ∈ (260, 640). From spectral analysis we characterize the Strouhal number and amplitude of the hairpin instability as a function of R and ReD. We demonstrate that the dynamics of the hairpins is well described by the Landau model, and, hence, that the instability occurs through Hopf bifurcation, similarly to other hydrodynamical oscillators such as wake behind different bluff bodies. Using the Landau model, we determine the precise threshold values of hairpin shedding. We also study the spatial dependence of this hydrodynamical instability, which shows a global behaviour.","lang":"eng"}],"date_published":"2019-03-25T00:00:00Z","article_processing_charge":"No","arxiv":1,"doi":"10.1017/jfm.2018.974","language":[{"iso":"eng"}],"project":[{"name":"ISTplus - Postdoctoral Fellowships","grant_number":"754411","call_identifier":"H2020","_id":"260C2330-B435-11E9-9278-68D0E5697425"}],"author":[{"id":"2C9AF1C2-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0003-1740-7635","full_name":"Klotz, Lukasz","first_name":"Lukasz","last_name":"Klotz"},{"first_name":"Konrad","full_name":"Gumowski, Konrad","last_name":"Gumowski"},{"first_name":"José Eduardo","full_name":"Wesfreid, José Eduardo","last_name":"Wesfreid"}],"type":"journal_article","day":"25","title":"Experiments on a jet in a crossflow in the low-velocity-ratio regime","ec_funded":1,"citation":{"mla":"Klotz, Lukasz, et al. “Experiments on a Jet in a Crossflow in the Low-Velocity-Ratio Regime.” <i>Journal of Fluid Mechanics</i>, vol. 863, Cambridge University Press, 2019, pp. 386–406, doi:<a href=\"https://doi.org/10.1017/jfm.2018.974\">10.1017/jfm.2018.974</a>.","ista":"Klotz L, Gumowski K, Wesfreid JE. 2019. Experiments on a jet in a crossflow in the low-velocity-ratio regime. Journal of Fluid Mechanics. 863, 386–406.","ieee":"L. Klotz, K. Gumowski, and J. E. Wesfreid, “Experiments on a jet in a crossflow in the low-velocity-ratio regime,” <i>Journal of Fluid Mechanics</i>, vol. 863. Cambridge University Press, pp. 386–406, 2019.","chicago":"Klotz, Lukasz, Konrad Gumowski, and José Eduardo Wesfreid. “Experiments on a Jet in a Crossflow in the Low-Velocity-Ratio Regime.” <i>Journal of Fluid Mechanics</i>. Cambridge University Press, 2019. <a href=\"https://doi.org/10.1017/jfm.2018.974\">https://doi.org/10.1017/jfm.2018.974</a>.","apa":"Klotz, L., Gumowski, K., &#38; Wesfreid, J. E. (2019). Experiments on a jet in a crossflow in the low-velocity-ratio regime. <i>Journal of Fluid Mechanics</i>. Cambridge University Press. <a href=\"https://doi.org/10.1017/jfm.2018.974\">https://doi.org/10.1017/jfm.2018.974</a>","ama":"Klotz L, Gumowski K, Wesfreid JE. Experiments on a jet in a crossflow in the low-velocity-ratio regime. <i>Journal of Fluid Mechanics</i>. 2019;863:386-406. doi:<a href=\"https://doi.org/10.1017/jfm.2018.974\">10.1017/jfm.2018.974</a>","short":"L. Klotz, K. Gumowski, J.E. Wesfreid, Journal of Fluid Mechanics 863 (2019) 386–406."},"intvolume":"       863","status":"public","department":[{"_id":"BjHo"}],"quality_controlled":"1","publication":"Journal of Fluid Mechanics","isi":1,"publisher":"Cambridge University Press","date_created":"2019-02-10T22:59:15Z","month":"03","page":"386-406"},{"file_date_updated":"2020-07-14T12:47:17Z","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","image":"/images/cc_by.png","short":"CC BY (4.0)"},"volume":10,"publication_status":"published","oa":1,"file":[{"access_level":"open_access","date_updated":"2020-07-14T12:47:17Z","checksum":"d3acf07eaad95ec040d8e8565fc9ac37","creator":"dernst","file_size":1331490,"file_name":"2019_NatureComm_Varshney.pdf","date_created":"2019-02-15T07:15:00Z","file_id":"6015","relation":"main_file","content_type":"application/pdf"}],"article_number":"652","_id":"6014","abstract":[{"lang":"eng","text":"Speed of sound waves in gases and liquids are governed by the compressibility of the medium. There exists another type of non-dispersive wave where the wave speed depends on stress instead of elasticity of the medium. A well-known example is the Alfven wave, which propagates through plasma permeated by a magnetic field with the speed determined by magnetic tension. An elastic analogue of Alfven waves has been predicted in a flow of dilute polymer solution where the elastic stress of the stretching polymers determines the elastic wave speed. Here we present quantitative evidence of elastic Alfven waves in elastic turbulence of a viscoelastic creeping flow between two obstacles in channel flow. The key finding in the experimental proof is a nonlinear dependence of the elastic wave speed cel on the Weissenberg number Wi, which deviates from predictions based on a model of linear polymer elasticity."}],"date_published":"2019-02-08T00:00:00Z","arxiv":1,"article_processing_charge":"No","scopus_import":"1","external_id":{"isi":["000458175300001"],"arxiv":["1902.03763"]},"date_updated":"2023-09-08T11:39:54Z","user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","publication_identifier":{"issn":["2041-1723"]},"article_type":"original","oa_version":"Published Version","has_accepted_license":"1","year":"2019","publication":"Nature Communications","quality_controlled":"1","department":[{"_id":"BjHo"}],"intvolume":"        10","status":"public","publisher":"Springer Nature","isi":1,"month":"02","date_created":"2019-02-15T07:10:46Z","language":[{"iso":"eng"}],"ddc":["530"],"doi":"10.1038/s41467-019-08551-0","project":[{"name":"ISTplus - Postdoctoral Fellowships","grant_number":"754411","_id":"260C2330-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"}],"day":"08","author":[{"last_name":"Varshney","full_name":"Varshney, Atul","first_name":"Atul","orcid":"0000-0002-3072-5999","id":"2A2006B2-F248-11E8-B48F-1D18A9856A87"},{"full_name":"Steinberg, Victor","first_name":"Victor","last_name":"Steinberg"}],"type":"journal_article","citation":{"apa":"Varshney, A., &#38; Steinberg, V. (2019). Elastic alfven waves in elastic turbulence. <i>Nature Communications</i>. Springer Nature. <a href=\"https://doi.org/10.1038/s41467-019-08551-0\">https://doi.org/10.1038/s41467-019-08551-0</a>","ama":"Varshney A, Steinberg V. Elastic alfven waves in elastic turbulence. <i>Nature Communications</i>. 2019;10. doi:<a href=\"https://doi.org/10.1038/s41467-019-08551-0\">10.1038/s41467-019-08551-0</a>","short":"A. Varshney, V. Steinberg, Nature Communications 10 (2019).","mla":"Varshney, Atul, and Victor Steinberg. “Elastic Alfven Waves in Elastic Turbulence.” <i>Nature Communications</i>, vol. 10, 652, Springer Nature, 2019, doi:<a href=\"https://doi.org/10.1038/s41467-019-08551-0\">10.1038/s41467-019-08551-0</a>.","ieee":"A. Varshney and V. Steinberg, “Elastic alfven waves in elastic turbulence,” <i>Nature Communications</i>, vol. 10. Springer Nature, 2019.","ista":"Varshney A, Steinberg V. 2019. Elastic alfven waves in elastic turbulence. Nature Communications. 10, 652.","chicago":"Varshney, Atul, and Victor Steinberg. “Elastic Alfven Waves in Elastic Turbulence.” <i>Nature Communications</i>. Springer Nature, 2019. <a href=\"https://doi.org/10.1038/s41467-019-08551-0\">https://doi.org/10.1038/s41467-019-08551-0</a>."},"ec_funded":1,"title":"Elastic alfven waves in elastic turbulence"},{"month":"02","date_created":"2019-03-05T13:18:30Z","publisher":"Springer Nature","isi":1,"department":[{"_id":"BjHo"}],"quality_controlled":"1","publication":"Nature Communications","status":"public","intvolume":"        10","ec_funded":1,"citation":{"ama":"Mayzel J, Steinberg V, Varshney A. Stokes flow analogous to viscous electron current in graphene. <i>Nature Communications</i>. 2019;10. doi:<a href=\"https://doi.org/10.1038/s41467-019-08916-5\">10.1038/s41467-019-08916-5</a>","apa":"Mayzel, J., Steinberg, V., &#38; Varshney, A. (2019). Stokes flow analogous to viscous electron current in graphene. <i>Nature Communications</i>. Springer Nature. <a href=\"https://doi.org/10.1038/s41467-019-08916-5\">https://doi.org/10.1038/s41467-019-08916-5</a>","short":"J. Mayzel, V. Steinberg, A. Varshney, Nature Communications 10 (2019).","mla":"Mayzel, Jonathan, et al. “Stokes Flow Analogous to Viscous Electron Current in Graphene.” <i>Nature Communications</i>, vol. 10, 937, Springer Nature, 2019, doi:<a href=\"https://doi.org/10.1038/s41467-019-08916-5\">10.1038/s41467-019-08916-5</a>.","chicago":"Mayzel, Jonathan, Victor Steinberg, and Atul Varshney. “Stokes Flow Analogous to Viscous Electron Current in Graphene.” <i>Nature Communications</i>. Springer Nature, 2019. <a href=\"https://doi.org/10.1038/s41467-019-08916-5\">https://doi.org/10.1038/s41467-019-08916-5</a>.","ista":"Mayzel J, Steinberg V, Varshney A. 2019. Stokes flow analogous to viscous electron current in graphene. Nature Communications. 10, 937.","ieee":"J. Mayzel, V. Steinberg, and A. Varshney, “Stokes flow analogous to viscous electron current in graphene,” <i>Nature Communications</i>, vol. 10. Springer Nature, 2019."},"title":"Stokes flow analogous to viscous electron current in graphene","day":"26","type":"journal_article","author":[{"full_name":"Mayzel, Jonathan","first_name":"Jonathan","last_name":"Mayzel"},{"full_name":"Steinberg, Victor","first_name":"Victor","last_name":"Steinberg"},{"full_name":"Varshney, Atul","first_name":"Atul","last_name":"Varshney","orcid":"0000-0002-3072-5999","id":"2A2006B2-F248-11E8-B48F-1D18A9856A87"}],"project":[{"_id":"260C2330-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","grant_number":"754411","name":"ISTplus - Postdoctoral Fellowships"}],"language":[{"iso":"eng"}],"ddc":["530","532"],"doi":"10.1038/s41467-019-08916-5","article_processing_charge":"No","file":[{"file_id":"6070","relation":"main_file","content_type":"application/pdf","date_created":"2019-03-05T13:33:04Z","file_size":2646391,"creator":"dernst","file_name":"2019_NatureComm_Mayzel.pdf","checksum":"61192fc49e0d44907c2a4fe384e4b97f","access_level":"open_access","date_updated":"2020-07-14T12:47:18Z"}],"article_number":"937","_id":"6069","abstract":[{"lang":"eng","text":"Electron transport in two-dimensional conducting materials such as graphene, with dominant electron–electron interaction, exhibits unusual vortex flow that leads to a nonlocal current-field relation (negative resistance), distinct from the classical Ohm’s law. The transport behavior of these materials is best described by low Reynolds number hydrodynamics, where the constitutive pressure–speed relation is Stoke’s law. Here we report evidence of such vortices observed in a viscous flow of Newtonian fluid in a microfluidic device consisting of a rectangular cavity—analogous to the electronic system. We extend our experimental observations to elliptic cavities of different eccentricities, and validate them by numerically solving bi-harmonic equation obtained for the viscous flow with no-slip boundary conditions. We verify the existence of a  predicted threshold at which vortices appear. Strikingly, we find that a two-dimensional theoretical model captures the essential features of three-dimensional Stokes flow in experiments."}],"date_published":"2019-02-26T00:00:00Z","publication_status":"published","oa":1,"file_date_updated":"2020-07-14T12:47:18Z","volume":10,"tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","image":"/images/cc_by.png","short":"CC BY (4.0)"},"has_accepted_license":"1","oa_version":"Published Version","year":"2019","date_updated":"2023-09-08T11:39:02Z","user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","scopus_import":"1","external_id":{"isi":["000459704600001"]},"publication_identifier":{"issn":["2041-1723"]}},{"oa_version":"Preprint","year":"2019","scopus_import":"1","external_id":{"isi":["000461922000006"],"arxiv":["1809.06358"]},"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","date_updated":"2024-03-25T23:30:27Z","publication_identifier":{"eissn":["10797114"],"issn":["00319007"]},"article_number":"114502","abstract":[{"lang":"eng","text":"Suspended particles can alter the properties of fluids and in particular also affect the transition fromlaminar to turbulent flow. An earlier study [Mataset al.,Phys. Rev. Lett.90, 014501 (2003)] reported howthe subcritical (i.e., hysteretic) transition to turbulent puffs is affected by the addition of particles. Here weshow that in addition to this known transition, with increasing concentration a supercritical (i.e.,continuous) transition to a globally fluctuating state is found. At the same time the Newtonian-typetransition to puffs is delayed to larger Reynolds numbers. At even higher concentration only the globallyfluctuating state is found. The dynamics of particle laden flows are hence determined by two competinginstabilities that give rise to three flow regimes: Newtonian-type turbulence at low, a particle inducedglobally fluctuating state at high, and a coexistence state at intermediate concentrations."}],"_id":"6189","date_published":"2019-03-22T00:00:00Z","arxiv":1,"article_processing_charge":"No","issue":"11","volume":122,"publication_status":"published","oa":1,"main_file_link":[{"url":"https://arxiv.org/abs/1809.06358","open_access":"1"}],"day":"22","type":"journal_article","author":[{"last_name":"Agrawal","full_name":"Agrawal, Nishchal","first_name":"Nishchal","id":"469E6004-F248-11E8-B48F-1D18A9856A87"},{"id":"448BD5BC-F248-11E8-B48F-1D18A9856A87","last_name":"Choueiri","full_name":"Choueiri, George H","first_name":"George H"},{"last_name":"Hof","first_name":"Björn","full_name":"Hof, Björn","orcid":"0000-0003-2057-2754","id":"3A374330-F248-11E8-B48F-1D18A9856A87"}],"citation":{"ama":"Agrawal N, Choueiri GH, Hof B. Transition to turbulence in particle laden flows. <i>Physical Review Letters</i>. 2019;122(11). doi:<a href=\"https://doi.org/10.1103/PhysRevLett.122.114502\">10.1103/PhysRevLett.122.114502</a>","apa":"Agrawal, N., Choueiri, G. H., &#38; Hof, B. (2019). Transition to turbulence in particle laden flows. <i>Physical Review Letters</i>. American Physical Society. <a href=\"https://doi.org/10.1103/PhysRevLett.122.114502\">https://doi.org/10.1103/PhysRevLett.122.114502</a>","short":"N. Agrawal, G.H. Choueiri, B. Hof, Physical Review Letters 122 (2019).","mla":"Agrawal, Nishchal, et al. “Transition to Turbulence in Particle Laden Flows.” <i>Physical Review Letters</i>, vol. 122, no. 11, 114502, American Physical Society, 2019, doi:<a href=\"https://doi.org/10.1103/PhysRevLett.122.114502\">10.1103/PhysRevLett.122.114502</a>.","chicago":"Agrawal, Nishchal, George H Choueiri, and Björn Hof. “Transition to Turbulence in Particle Laden Flows.” <i>Physical Review Letters</i>. American Physical Society, 2019. <a href=\"https://doi.org/10.1103/PhysRevLett.122.114502\">https://doi.org/10.1103/PhysRevLett.122.114502</a>.","ista":"Agrawal N, Choueiri GH, Hof B. 2019. Transition to turbulence in particle laden flows. Physical Review Letters. 122(11), 114502.","ieee":"N. Agrawal, G. H. Choueiri, and B. Hof, “Transition to turbulence in particle laden flows,” <i>Physical Review Letters</i>, vol. 122, no. 11. American Physical Society, 2019."},"title":"Transition to turbulence in particle laden flows","language":[{"iso":"eng"}],"doi":"10.1103/PhysRevLett.122.114502","related_material":{"record":[{"status":"public","relation":"dissertation_contains","id":"9728"}]},"month":"03","date_created":"2019-03-31T21:59:12Z","publication":"Physical Review Letters","department":[{"_id":"BjHo"}],"quality_controlled":"1","intvolume":"       122","status":"public","publisher":"American Physical Society","isi":1},{"language":[{"iso":"eng"}],"doi":"10.1017/jfm.2019.191","project":[{"name":"Decoding the complexity of turbulence at its origin","grant_number":"306589","_id":"25152F3A-B435-11E9-9278-68D0E5697425","call_identifier":"FP7"},{"grant_number":"737549","name":"Eliminating turbulence in oil pipelines","call_identifier":"H2020","_id":"25104D44-B435-11E9-9278-68D0E5697425"}],"related_material":{"link":[{"relation":"supplementary_material","url":"https://doi.org/10.1017/jfm.2019.191"}],"record":[{"status":"public","relation":"dissertation_contains","id":"7258"}]},"day":"25","type":"journal_article","author":[{"orcid":"0000-0001-5227-4271","id":"40315C30-F248-11E8-B48F-1D18A9856A87","last_name":"Scarselli","first_name":"Davide","full_name":"Scarselli, Davide"},{"last_name":"Kühnen","full_name":"Kühnen, Jakob","first_name":"Jakob","id":"3A47AE32-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0003-4312-0179"},{"first_name":"Björn","full_name":"Hof, Björn","last_name":"Hof","orcid":"0000-0003-2057-2754","id":"3A374330-F248-11E8-B48F-1D18A9856A87"}],"citation":{"apa":"Scarselli, D., Kühnen, J., &#38; Hof, B. (2019). Relaminarising pipe flow by wall movement. <i>Journal of Fluid Mechanics</i>. Cambridge University Press. <a href=\"https://doi.org/10.1017/jfm.2019.191\">https://doi.org/10.1017/jfm.2019.191</a>","ama":"Scarselli D, Kühnen J, Hof B. Relaminarising pipe flow by wall movement. <i>Journal of Fluid Mechanics</i>. 2019;867:934-948. doi:<a href=\"https://doi.org/10.1017/jfm.2019.191\">10.1017/jfm.2019.191</a>","short":"D. Scarselli, J. Kühnen, B. Hof, Journal of Fluid Mechanics 867 (2019) 934–948.","mla":"Scarselli, Davide, et al. “Relaminarising Pipe Flow by Wall Movement.” <i>Journal of Fluid Mechanics</i>, vol. 867, Cambridge University Press, 2019, pp. 934–48, doi:<a href=\"https://doi.org/10.1017/jfm.2019.191\">10.1017/jfm.2019.191</a>.","ista":"Scarselli D, Kühnen J, Hof B. 2019. Relaminarising pipe flow by wall movement. Journal of Fluid Mechanics. 867, 934–948.","ieee":"D. Scarselli, J. Kühnen, and B. Hof, “Relaminarising pipe flow by wall movement,” <i>Journal of Fluid Mechanics</i>, vol. 867. Cambridge University Press, pp. 934–948, 2019.","chicago":"Scarselli, Davide, Jakob Kühnen, and Björn Hof. “Relaminarising Pipe Flow by Wall Movement.” <i>Journal of Fluid Mechanics</i>. Cambridge University Press, 2019. <a href=\"https://doi.org/10.1017/jfm.2019.191\">https://doi.org/10.1017/jfm.2019.191</a>."},"ec_funded":1,"title":"Relaminarising pipe flow by wall movement","publication":"Journal of Fluid Mechanics","department":[{"_id":"BjHo"}],"quality_controlled":"1","status":"public","intvolume":"       867","publisher":"Cambridge University Press","isi":1,"month":"05","date_created":"2019-04-07T21:59:14Z","page":"934-948","scopus_import":"1","external_id":{"arxiv":["1807.05357"],"isi":["000462606100001"]},"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","date_updated":"2024-03-25T23:30:20Z","publication_identifier":{"eissn":["14697645"],"issn":["00221120"]},"year":"2019","oa_version":"Preprint","volume":867,"publication_status":"published","main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/1807.05357"}],"oa":1,"_id":"6228","date_published":"2019-05-25T00:00:00Z","abstract":[{"lang":"eng","text":"Following  the  recent  observation  that  turbulent  pipe  flow  can  be  relaminarised  bya  relatively  simple  modification  of  the  mean  velocity  profile,  we  here  carry  out  aquantitative  experimental  investigation  of  this  phenomenon.  Our  study  confirms  thata  flat  velocity  profile  leads  to  a  collapse  of  turbulence  and  in  order  to  achieve  theblunted  profile  shape,  we  employ  a  moving  pipe  segment  that  is  briefly  and  rapidlyshifted  in  the  streamwise  direction.  The  relaminarisation  threshold  and  the  minimumshift  length  and  speeds  are  determined  as  a  function  of  Reynolds  number.  Althoughturbulence  is  still  active  after  the  acceleration  phase,  the  modulated  profile  possessesa  severely  decreased  lift-up  potential  as  measured  by  transient  growth.  As  shown,this  results  in  an  exponential  decay  of  fluctuations  and  the  flow  relaminarises.  Whilethis  method  can  be  easily  applied  at  low  to  moderate  flow  speeds,  the  minimumstreamwise  length  over  which  the  acceleration  needs  to  act  increases  linearly  with  theReynolds  number."}],"arxiv":1,"article_processing_charge":"No"},{"doi":"10.1016/j.ijmultiphaseflow.2019.04.027","language":[{"iso":"eng"}],"type":"journal_article","author":[{"full_name":"Song, Baofang","first_name":"Baofang","last_name":"Song"},{"last_name":"Plana","full_name":"Plana, Carlos","first_name":"Carlos"},{"id":"40770848-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-0384-2022","first_name":"Jose M","full_name":"Lopez Alonso, Jose M","last_name":"Lopez Alonso"},{"last_name":"Avila","full_name":"Avila, Marc","first_name":"Marc"}],"day":"01","title":"Phase-field simulation of core-annular pipe flow","citation":{"apa":"Song, B., Plana, C., Lopez Alonso, J. M., &#38; Avila, M. (2019). Phase-field simulation of core-annular pipe flow. <i>International Journal of Multiphase Flow</i>. Elsevier. <a href=\"https://doi.org/10.1016/j.ijmultiphaseflow.2019.04.027\">https://doi.org/10.1016/j.ijmultiphaseflow.2019.04.027</a>","ama":"Song B, Plana C, Lopez Alonso JM, Avila M. Phase-field simulation of core-annular pipe flow. <i>International Journal of Multiphase Flow</i>. 2019;117:14-24. doi:<a href=\"https://doi.org/10.1016/j.ijmultiphaseflow.2019.04.027\">10.1016/j.ijmultiphaseflow.2019.04.027</a>","short":"B. Song, C. Plana, J.M. Lopez Alonso, M. Avila, International Journal of Multiphase Flow 117 (2019) 14–24.","mla":"Song, Baofang, et al. “Phase-Field Simulation of Core-Annular Pipe Flow.” <i>International Journal of Multiphase Flow</i>, vol. 117, Elsevier, 2019, pp. 14–24, doi:<a href=\"https://doi.org/10.1016/j.ijmultiphaseflow.2019.04.027\">10.1016/j.ijmultiphaseflow.2019.04.027</a>.","ista":"Song B, Plana C, Lopez Alonso JM, Avila M. 2019. Phase-field simulation of core-annular pipe flow. International Journal of Multiphase Flow. 117, 14–24.","ieee":"B. Song, C. Plana, J. M. Lopez Alonso, and M. Avila, “Phase-field simulation of core-annular pipe flow,” <i>International Journal of Multiphase Flow</i>, vol. 117. Elsevier, pp. 14–24, 2019.","chicago":"Song, Baofang, Carlos Plana, Jose M Lopez Alonso, and Marc Avila. “Phase-Field Simulation of Core-Annular Pipe Flow.” <i>International Journal of Multiphase Flow</i>. Elsevier, 2019. <a href=\"https://doi.org/10.1016/j.ijmultiphaseflow.2019.04.027\">https://doi.org/10.1016/j.ijmultiphaseflow.2019.04.027</a>."},"status":"public","intvolume":"       117","publication":"International Journal of Multiphase Flow","department":[{"_id":"BjHo"}],"quality_controlled":"1","isi":1,"publisher":"Elsevier","date_created":"2019-05-13T07:58:35Z","month":"08","page":"14-24","publication_identifier":{"issn":["03019322"]},"scopus_import":"1","external_id":{"arxiv":["1902.07351"],"isi":["000474496000002"]},"date_updated":"2023-08-25T10:19:55Z","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","year":"2019","oa_version":"Preprint","article_type":"original","volume":117,"oa":1,"main_file_link":[{"url":"https://arxiv.org/abs/1902.07351","open_access":"1"}],"publication_status":"published","abstract":[{"lang":"eng","text":"Phase-field methods have long been used to model the flow of immiscible fluids. Their ability to naturally capture interface topological changes is widely recognized, but their accuracy in simulating flows of real fluids in practical geometries is not established. We here quantitatively investigate the convergence of the phase-field method to the sharp-interface limit with simulations of two-phase pipe flow. We focus on core-annular flows, in which a highly viscous fluid is lubricated by a less viscous fluid, and validate our simulations with an analytic laminar solution, a formal linear stability analysis and also in the fully nonlinear regime. We demonstrate the ability of the phase-field method to accurately deal with non-rectangular geometry, strong advection, unsteady fluctuations and large viscosity contrast. We argue that phase-field methods are very promising for quantitatively studying moderately turbulent flows, especially at high concentrations of the disperse phase."}],"_id":"6413","date_published":"2019-08-01T00:00:00Z","article_processing_charge":"No","arxiv":1},{"citation":{"mla":"Kühnen, Jakob, et al. “Relaminarization of Pipe Flow by Means of 3D-Printed Shaped Honeycombs.” <i>Journal of Fluids Engineering</i>, vol. 141, no. 11, 111105, ASME, 2019, doi:<a href=\"https://doi.org/10.1115/1.4043494\">10.1115/1.4043494</a>.","ieee":"J. Kühnen, D. Scarselli, and B. Hof, “Relaminarization of pipe flow by means of 3D-printed shaped honeycombs,” <i>Journal of Fluids Engineering</i>, vol. 141, no. 11. ASME, 2019.","ista":"Kühnen J, Scarselli D, Hof B. 2019. Relaminarization of pipe flow by means of 3D-printed shaped honeycombs. Journal of Fluids Engineering. 141(11), 111105.","chicago":"Kühnen, Jakob, Davide Scarselli, and Björn Hof. “Relaminarization of Pipe Flow by Means of 3D-Printed Shaped Honeycombs.” <i>Journal of Fluids Engineering</i>. ASME, 2019. <a href=\"https://doi.org/10.1115/1.4043494\">https://doi.org/10.1115/1.4043494</a>.","apa":"Kühnen, J., Scarselli, D., &#38; Hof, B. (2019). Relaminarization of pipe flow by means of 3D-printed shaped honeycombs. <i>Journal of Fluids Engineering</i>. ASME. <a href=\"https://doi.org/10.1115/1.4043494\">https://doi.org/10.1115/1.4043494</a>","ama":"Kühnen J, Scarselli D, Hof B. Relaminarization of pipe flow by means of 3D-printed shaped honeycombs. <i>Journal of Fluids Engineering</i>. 2019;141(11). doi:<a href=\"https://doi.org/10.1115/1.4043494\">10.1115/1.4043494</a>","short":"J. Kühnen, D. Scarselli, B. Hof, Journal of Fluids Engineering 141 (2019)."},"ec_funded":1,"title":"Relaminarization of pipe flow by means of 3D-printed shaped honeycombs","day":"01","author":[{"last_name":"Kühnen","full_name":"Kühnen, Jakob","first_name":"Jakob","id":"3A47AE32-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0003-4312-0179"},{"id":"40315C30-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-5227-4271","first_name":"Davide","full_name":"Scarselli, Davide","last_name":"Scarselli"},{"id":"3A374330-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0003-2057-2754","first_name":"Björn","full_name":"Hof, Björn","last_name":"Hof"}],"type":"journal_article","project":[{"grant_number":"306589","name":"Decoding the complexity of turbulence at its origin","_id":"25152F3A-B435-11E9-9278-68D0E5697425","call_identifier":"FP7"}],"related_material":{"record":[{"status":"public","relation":"dissertation_contains","id":"7258"}]},"language":[{"iso":"eng"}],"doi":"10.1115/1.4043494","month":"11","date_created":"2019-05-26T21:59:13Z","publisher":"ASME","isi":1,"publication":"Journal of Fluids Engineering","quality_controlled":"1","department":[{"_id":"BjHo"}],"status":"public","intvolume":"       141","article_type":"original","oa_version":"Preprint","year":"2019","scopus_import":"1","external_id":{"isi":["000487748600005"],"arxiv":["1809.07625"]},"date_updated":"2024-03-25T23:30:20Z","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","acknowledged_ssus":[{"_id":"M-Shop"}],"publication_identifier":{"issn":["00982202"],"eissn":["1528901X"]},"arxiv":1,"article_processing_charge":"No","issue":"11","article_number":"111105","_id":"6486","abstract":[{"lang":"eng","text":"Based on a novel control scheme, where a steady modification of the streamwise velocity profile leads to complete relaminarization of initially fully turbulent pipe flow, we investigate the applicability and usefulness of custom-shaped honeycombs for such control. The custom-shaped honeycombs are used as stationary flow management devices which generate specific modifications of the streamwise velocity profile. Stereoscopic particle image velocimetry and pressure drop measurements are used to investigate and capture the development of the relaminarizing flow downstream these devices. We compare the performance of straight (constant length across the radius of the pipe) honeycombs with custom-shaped ones (variable length across the radius) and try to determine the optimal shape for maximal relaminarization at minimal pressure loss. The optimally modified streamwise velocity profile is found to be M-shaped, and the maximum attainable Reynolds number for total relaminarization is found to be of the order of 10,000. Consequently, the respective reduction in skin friction downstream of the device is almost by a factor of 5. The break-even point, where the additional pressure drop caused by the device is balanced by the savings due to relaminarization and a net gain is obtained, corresponds to a downstream stretch of distances as low as approximately 100 pipe diameters of laminar flow."}],"date_published":"2019-11-01T00:00:00Z","publication_status":"published","oa":1,"main_file_link":[{"url":"https://arxiv.org/abs/1809.07625","open_access":"1"}],"volume":141},{"file":[{"creator":"dernst","file_size":3356292,"file_name":"2019_Cell_Shamipour_accepted.pdf","access_level":"open_access","date_updated":"2020-10-21T07:22:34Z","checksum":"aea43726d80e35ce3885073a5f05c3e3","relation":"main_file","file_id":"8686","content_type":"application/pdf","success":1,"date_created":"2020-10-21T07:22:34Z"}],"_id":"6508","date_published":"2019-05-30T00:00:00Z","abstract":[{"text":"Segregation of maternal determinants within the oocyte constitutes the first step in embryo patterning. In zebrafish oocytes, extensive ooplasmic streaming leads to the segregation of ooplasm from yolk granules along the animal-vegetal axis of the oocyte. Here, we show that this process does not rely on cortical actin reorganization, as previously thought, but instead on a cell-cycle-dependent bulk actin polymerization wave traveling from the animal to the vegetal pole of the oocyte. This wave functions in segregation by both pulling ooplasm animally and pushing yolk granules vegetally. Using biophysical experimentation and theory, we show that ooplasm pulling is mediated by bulk actin network flows exerting friction forces on the ooplasm, while yolk granule pushing is achieved by a mechanism closely resembling actin comet formation on yolk granules. Our study defines a novel role of cell-cycle-controlled bulk actin polymerization waves in oocyte polarization via ooplasmic segregation.","lang":"eng"}],"issue":"6","article_processing_charge":"No","file_date_updated":"2020-10-21T07:22:34Z","volume":177,"publication_status":"published","main_file_link":[{"url":"https://doi.org/10.1016/j.cell.2019.04.030","open_access":"1"}],"oa":1,"article_type":"original","has_accepted_license":"1","year":"2019","oa_version":"Published Version","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","date_updated":"2024-03-25T23:30:21Z","external_id":{"pmid":["31080065"],"isi":["000469415100013"]},"scopus_import":"1","acknowledged_ssus":[{"_id":"Bio"},{"_id":"PreCl"}],"publication_identifier":{"eissn":["10974172"],"issn":["00928674"]},"month":"05","date_created":"2019-06-02T21:59:12Z","page":"1463-1479.e18","quality_controlled":"1","department":[{"_id":"CaHe"},{"_id":"EdHa"},{"_id":"BjHo"}],"publication":"Cell","intvolume":"       177","status":"public","publisher":"Elsevier","isi":1,"day":"30","author":[{"id":"40B34FE2-F248-11E8-B48F-1D18A9856A87","last_name":"Shamipour","full_name":"Shamipour, Shayan","first_name":"Shayan"},{"last_name":"Kardos","first_name":"Roland","full_name":"Kardos, Roland","id":"4039350E-F248-11E8-B48F-1D18A9856A87"},{"full_name":"Xue, Shi-lei","first_name":"Shi-lei","last_name":"Xue","id":"31D2C804-F248-11E8-B48F-1D18A9856A87"},{"full_name":"Hof, Björn","first_name":"Björn","last_name":"Hof","id":"3A374330-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0003-2057-2754"},{"last_name":"Hannezo","first_name":"Edouard B","full_name":"Hannezo, Edouard B","id":"3A9DB764-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-6005-1561"},{"first_name":"Carl-Philipp J","full_name":"Heisenberg, Carl-Philipp J","last_name":"Heisenberg","orcid":"0000-0002-0912-4566","id":"39427864-F248-11E8-B48F-1D18A9856A87"}],"type":"journal_article","ec_funded":1,"citation":{"ama":"Shamipour S, Kardos R, Xue S, Hof B, Hannezo EB, Heisenberg C-PJ. Bulk actin dynamics drive phase segregation in zebrafish oocytes. <i>Cell</i>. 2019;177(6):1463-1479.e18. doi:<a href=\"https://doi.org/10.1016/j.cell.2019.04.030\">10.1016/j.cell.2019.04.030</a>","apa":"Shamipour, S., Kardos, R., Xue, S., Hof, B., Hannezo, E. B., &#38; Heisenberg, C.-P. J. (2019). Bulk actin dynamics drive phase segregation in zebrafish oocytes. <i>Cell</i>. Elsevier. <a href=\"https://doi.org/10.1016/j.cell.2019.04.030\">https://doi.org/10.1016/j.cell.2019.04.030</a>","short":"S. Shamipour, R. Kardos, S. Xue, B. Hof, E.B. Hannezo, C.-P.J. Heisenberg, Cell 177 (2019) 1463–1479.e18.","mla":"Shamipour, Shayan, et al. “Bulk Actin Dynamics Drive Phase Segregation in Zebrafish Oocytes.” <i>Cell</i>, vol. 177, no. 6, Elsevier, 2019, p. 1463–1479.e18, doi:<a href=\"https://doi.org/10.1016/j.cell.2019.04.030\">10.1016/j.cell.2019.04.030</a>.","chicago":"Shamipour, Shayan, Roland Kardos, Shi-lei Xue, Björn Hof, Edouard B Hannezo, and Carl-Philipp J Heisenberg. “Bulk Actin Dynamics Drive Phase Segregation in Zebrafish Oocytes.” <i>Cell</i>. Elsevier, 2019. <a href=\"https://doi.org/10.1016/j.cell.2019.04.030\">https://doi.org/10.1016/j.cell.2019.04.030</a>.","ista":"Shamipour S, Kardos R, Xue S, Hof B, Hannezo EB, Heisenberg C-PJ. 2019. Bulk actin dynamics drive phase segregation in zebrafish oocytes. Cell. 177(6), 1463–1479.e18.","ieee":"S. Shamipour, R. Kardos, S. Xue, B. Hof, E. B. Hannezo, and C.-P. J. Heisenberg, “Bulk actin dynamics drive phase segregation in zebrafish oocytes,” <i>Cell</i>, vol. 177, no. 6. Elsevier, p. 1463–1479.e18, 2019."},"title":"Bulk actin dynamics drive phase segregation in zebrafish oocytes","language":[{"iso":"eng"}],"ddc":["570"],"doi":"10.1016/j.cell.2019.04.030","acknowledgement":"We would like to thank Pierre Recho, Guillaume Salbreux, and Silvia Grigolon for advice on the theory, Lila Solnica-Krezel for kindly providing us with zebrafish dachsous mutants, members of the Heisenberg and Hannezo groups for fruitful discussions, and the Bioimaging and zebrafish facilities at IST Austria for their continuous support. This project has received funding from the European Union (European Research Council Advanced Grant 742573 to C.P.H.) and from the Austrian Science Fund (FWF) (P 31639 to E.H.).","pmid":1,"project":[{"name":"Interaction and feedback between cell mechanics and fate specification in vertebrate gastrulation","grant_number":"742573","call_identifier":"H2020","_id":"260F1432-B435-11E9-9278-68D0E5697425"},{"name":"Active mechano-chemical description of the cell cytoskeleton","grant_number":"P31639","_id":"268294B6-B435-11E9-9278-68D0E5697425","call_identifier":"FWF"}],"related_material":{"link":[{"description":"News on IST Homepage","url":"https://ist.ac.at/en/news/how-the-cytoplasm-separates-from-the-yolk/","relation":"press_release"}],"record":[{"relation":"dissertation_contains","id":"8350","status":"public"}]}},{"arxiv":1,"article_processing_charge":"No","issue":"5","article_number":"054401","_id":"291","date_published":"2018-05-30T00:00:00Z","abstract":[{"lang":"eng","text":"Over the past decade, the edge of chaos has proven to be a fruitful starting point for investigations of shear flows when the laminar base flow is linearly stable. Numerous computational studies of shear flows demonstrated the existence of states that separate laminar and turbulent regions of the state space. In addition, some studies determined invariant solutions that reside on this edge. In this paper, we study the unstable manifold of one such solution with the aid of continuous symmetry reduction, which we formulate here for the simultaneous quotiening of axial and azimuthal symmetries. Upon our investigation of the unstable manifold, we discover a previously unknown traveling-wave solution on the laminar-turbulent boundary with a relatively complex structure. By means of low-dimensional projections, we visualize different dynamical paths that connect these solutions to the turbulence. Our numerical experiments demonstrate that the laminar-turbulent boundary exhibits qualitatively different regions whose properties are influenced by the nearby invariant solutions."}],"publication_status":"published","oa":1,"main_file_link":[{"url":"https://arxiv.org/abs/1802.01918","open_access":"1"}],"volume":3,"publist_id":"7590","year":"2018","oa_version":"Preprint","scopus_import":"1","external_id":{"isi":["000433426200001"],"arxiv":["1802.01918"]},"user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","date_updated":"2023-09-11T12:45:44Z","month":"05","date_created":"2018-12-11T11:45:39Z","publisher":"American Physical Society","isi":1,"publication":"Physical Review Fluids","department":[{"_id":"BjHo"}],"quality_controlled":"1","status":"public","intvolume":"         3","citation":{"ista":"Budanur NB, Hof B. 2018. Complexity of the laminar-turbulent boundary in pipe flow. Physical Review Fluids. 3(5), 054401.","ieee":"N. B. Budanur and B. Hof, “Complexity of the laminar-turbulent boundary in pipe flow,” <i>Physical Review Fluids</i>, vol. 3, no. 5. American Physical Society, 2018.","chicago":"Budanur, Nazmi B, and Björn Hof. “Complexity of the Laminar-Turbulent Boundary in Pipe Flow.” <i>Physical Review Fluids</i>. American Physical Society, 2018. <a href=\"https://doi.org/10.1103/PhysRevFluids.3.054401\">https://doi.org/10.1103/PhysRevFluids.3.054401</a>.","mla":"Budanur, Nazmi B., and Björn Hof. “Complexity of the Laminar-Turbulent Boundary in Pipe Flow.” <i>Physical Review Fluids</i>, vol. 3, no. 5, 054401, American Physical Society, 2018, doi:<a href=\"https://doi.org/10.1103/PhysRevFluids.3.054401\">10.1103/PhysRevFluids.3.054401</a>.","short":"N.B. Budanur, B. Hof, Physical Review Fluids 3 (2018).","apa":"Budanur, N. B., &#38; Hof, B. (2018). Complexity of the laminar-turbulent boundary in pipe flow. <i>Physical Review Fluids</i>. American Physical Society. <a href=\"https://doi.org/10.1103/PhysRevFluids.3.054401\">https://doi.org/10.1103/PhysRevFluids.3.054401</a>","ama":"Budanur NB, Hof B. Complexity of the laminar-turbulent boundary in pipe flow. <i>Physical Review Fluids</i>. 2018;3(5). doi:<a href=\"https://doi.org/10.1103/PhysRevFluids.3.054401\">10.1103/PhysRevFluids.3.054401</a>"},"title":"Complexity of the laminar-turbulent boundary in pipe flow","day":"30","type":"journal_article","author":[{"full_name":"Budanur, Nazmi B","first_name":"Nazmi B","last_name":"Budanur","orcid":"0000-0003-0423-5010","id":"3EA1010E-F248-11E8-B48F-1D18A9856A87"},{"full_name":"Hof, Björn","first_name":"Björn","last_name":"Hof","orcid":"0000-0003-2057-2754","id":"3A374330-F248-11E8-B48F-1D18A9856A87"}],"language":[{"iso":"eng"}],"doi":"10.1103/PhysRevFluids.3.054401"},{"year":"2018","oa_version":"Preprint","publist_id":"7537","acknowledged_ssus":[{"_id":"SSU"}],"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","date_updated":"2023-10-10T13:27:44Z","external_id":{"isi":["000427804000005"]},"scopus_import":"1","_id":"328","date_published":"2018-03-19T00:00:00Z","abstract":[{"lang":"eng","text":"The drag of turbulent flows can be drastically decreased by adding small amounts of high molecular weight polymers. While drag reduction initially increases with polymer concentration, it eventually saturates to what is known as the maximum drag reduction (MDR) asymptote; this asymptote is generally attributed to the dynamics being reduced to a marginal yet persistent state of subdued turbulent motion. Contrary to this accepted view, we show that, for an appropriate choice of parameters, polymers can reduce the drag beyond the suggested asymptotic limit, eliminating turbulence and giving way to laminar flow. At higher polymer concentrations, however, the laminar state becomes unstable, resulting in a fluctuating flow with the characteristic drag of the MDR asymptote. Our findings indicate that the asymptotic state is hence dynamically disconnected from ordinary turbulence. © 2018 American Physical Society."}],"article_number":"124501","issue":"12","article_processing_charge":"No","volume":120,"main_file_link":[{"url":"https://arxiv.org/abs/1703.06271","open_access":"1"}],"oa":1,"publication_status":"published","type":"journal_article","author":[{"id":"448BD5BC-F248-11E8-B48F-1D18A9856A87","last_name":"Choueiri","first_name":"George H","full_name":"Choueiri, George H"},{"id":"40770848-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-0384-2022","last_name":"Lopez Alonso","full_name":"Lopez Alonso, Jose M","first_name":"Jose M"},{"full_name":"Hof, Björn","first_name":"Björn","last_name":"Hof","orcid":"0000-0003-2057-2754","id":"3A374330-F248-11E8-B48F-1D18A9856A87"}],"day":"19","title":"Exceeding the asymptotic limit of polymer drag reduction","ec_funded":1,"citation":{"chicago":"Choueiri, George H, Jose M Lopez Alonso, and Björn Hof. “Exceeding the Asymptotic Limit of Polymer Drag Reduction.” <i>Physical Review Letters</i>. American Physical Society, 2018. <a href=\"https://doi.org/10.1103/PhysRevLett.120.124501\">https://doi.org/10.1103/PhysRevLett.120.124501</a>.","ieee":"G. H. Choueiri, J. M. Lopez Alonso, and B. Hof, “Exceeding the asymptotic limit of polymer drag reduction,” <i>Physical Review Letters</i>, vol. 120, no. 12. American Physical Society, 2018.","ista":"Choueiri GH, Lopez Alonso JM, Hof B. 2018. Exceeding the asymptotic limit of polymer drag reduction. Physical Review Letters. 120(12), 124501.","mla":"Choueiri, George H., et al. “Exceeding the Asymptotic Limit of Polymer Drag Reduction.” <i>Physical Review Letters</i>, vol. 120, no. 12, 124501, American Physical Society, 2018, doi:<a href=\"https://doi.org/10.1103/PhysRevLett.120.124501\">10.1103/PhysRevLett.120.124501</a>.","short":"G.H. Choueiri, J.M. Lopez Alonso, B. Hof, Physical Review Letters 120 (2018).","ama":"Choueiri GH, Lopez Alonso JM, Hof B. Exceeding the asymptotic limit of polymer drag reduction. <i>Physical Review Letters</i>. 2018;120(12). doi:<a href=\"https://doi.org/10.1103/PhysRevLett.120.124501\">10.1103/PhysRevLett.120.124501</a>","apa":"Choueiri, G. H., Lopez Alonso, J. M., &#38; Hof, B. (2018). Exceeding the asymptotic limit of polymer drag reduction. <i>Physical Review Letters</i>. American Physical Society. <a href=\"https://doi.org/10.1103/PhysRevLett.120.124501\">https://doi.org/10.1103/PhysRevLett.120.124501</a>"},"doi":"10.1103/PhysRevLett.120.124501","language":[{"iso":"eng"}],"acknowledgement":"The authors thank Philipp Maier and the IST Austria workshop for their dedicated technical support.","project":[{"call_identifier":"FP7","_id":"25681D80-B435-11E9-9278-68D0E5697425","name":"International IST Postdoc Fellowship Programme","grant_number":"291734"},{"name":"Decoding the complexity of turbulence at its origin","grant_number":"306589","call_identifier":"FP7","_id":"25152F3A-B435-11E9-9278-68D0E5697425"}],"date_created":"2018-12-11T11:45:51Z","month":"03","status":"public","intvolume":"       120","department":[{"_id":"BjHo"}],"quality_controlled":"1","publication":"Physical Review Letters","isi":1,"publisher":"American Physical Society"},{"ec_funded":1,"citation":{"ista":"Varshney A, Steinberg V. 2018. Drag enhancement and drag reduction in viscoelastic flow. Physical Review Fluids. 3(10), 103302.","ieee":"A. Varshney and V. Steinberg, “Drag enhancement and drag reduction in viscoelastic flow,” <i>Physical Review Fluids</i>, vol. 3, no. 10. American Physical Society, 2018.","chicago":"Varshney, Atul, and Victor Steinberg. “Drag Enhancement and Drag Reduction in Viscoelastic Flow.” <i>Physical Review Fluids</i>. American Physical Society, 2018. <a href=\"https://doi.org/10.1103/PhysRevFluids.3.103302\">https://doi.org/10.1103/PhysRevFluids.3.103302</a>.","mla":"Varshney, Atul, and Victor Steinberg. “Drag Enhancement and Drag Reduction in Viscoelastic Flow.” <i>Physical Review Fluids</i>, vol. 3, no. 10, 103302, American Physical Society, 2018, doi:<a href=\"https://doi.org/10.1103/PhysRevFluids.3.103302\">10.1103/PhysRevFluids.3.103302</a>.","short":"A. Varshney, V. Steinberg, Physical Review Fluids 3 (2018).","apa":"Varshney, A., &#38; Steinberg, V. (2018). Drag enhancement and drag reduction in viscoelastic flow. <i>Physical Review Fluids</i>. American Physical Society. <a href=\"https://doi.org/10.1103/PhysRevFluids.3.103302\">https://doi.org/10.1103/PhysRevFluids.3.103302</a>","ama":"Varshney A, Steinberg V. Drag enhancement and drag reduction in viscoelastic flow. <i>Physical Review Fluids</i>. 2018;3(10). doi:<a href=\"https://doi.org/10.1103/PhysRevFluids.3.103302\">10.1103/PhysRevFluids.3.103302</a>"},"title":"Drag enhancement and drag reduction in viscoelastic flow","day":"15","type":"journal_article","author":[{"full_name":"Varshney, Atul","first_name":"Atul","last_name":"Varshney","id":"2A2006B2-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-3072-5999"},{"first_name":"Victor","full_name":"Steinberg, Victor","last_name":"Steinberg"}],"project":[{"name":"ISTplus - Postdoctoral Fellowships","grant_number":"754411","_id":"260C2330-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"}],"language":[{"iso":"eng"}],"doi":"10.1103/PhysRevFluids.3.103302","ddc":["532"],"month":"10","date_created":"2018-12-11T11:44:11Z","publisher":"American Physical Society","isi":1,"department":[{"_id":"BjHo"}],"quality_controlled":"1","publication":"Physical Review Fluids","intvolume":"         3","status":"public","publist_id":"8038","oa_version":"Published Version","year":"2018","has_accepted_license":"1","user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","date_updated":"2023-09-11T12:59:28Z","scopus_import":"1","external_id":{"isi":["000447311500001"]},"issue":"10","article_processing_charge":"No","file":[{"relation":"main_file","file_id":"4800","content_type":"application/pdf","date_created":"2018-12-12T10:10:14Z","creator":"system","file_size":1409040,"file_name":"IST-2018-1061-v1+1_PhysRevFluids.3.103302.pdf","access_level":"open_access","date_updated":"2020-07-14T12:45:12Z","checksum":"e1445be33e8165114e96246275600750"}],"article_number":"103302 ","_id":"17","date_published":"2018-10-15T00:00:00Z","abstract":[{"lang":"eng","text":"Creeping flow of polymeric fluid without inertia exhibits elastic instabilities and elastic turbulence accompanied by drag enhancement due to elastic stress produced by flow-stretched polymers. However, in inertia-dominated flow at high Re and low fluid elasticity El, a reduction in turbulent frictional drag is caused by an intricate competition between inertial and elastic stresses. Here we explore the effect of inertia on the stability of viscoelastic flow in a broad range of control parameters El and (Re,Wi). We present the stability diagram of observed flow regimes in Wi-Re coordinates and find that the instabilities' onsets show an unexpectedly nonmonotonic dependence on El. Further, three distinct regions in the diagram are identified based on El. Strikingly, for high-elasticity fluids we discover a complete relaminarization of flow at Reynolds number in the range of 1 to 10, different from a well-known turbulent drag reduction. These counterintuitive effects may be explained by a finite polymer extensibility and a suppression of vorticity at high Wi. Our results call for further theoretical and numerical development to uncover the role of inertial effect on elastic turbulence in a viscoelastic flow."}],"publication_status":"published","oa":1,"file_date_updated":"2020-07-14T12:45:12Z","volume":3,"pubrep_id":"1061"},{"doi":"10.1038/s41567-017-0018-3","language":[{"iso":"eng"}],"acknowledgement":"We acknowledge the European Research Council under the European Union’s Seventh Framework Programme (FP/2007-2013)/ERC Grant Agreement 306589, the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement no. 737549) and the Deutsche Forschungsgemeinschaft (Project No. FOR 1182) for financial support. We thank our technician P. Maier for providing highly valuable ideas and greatly supporting us in all technical aspects. We thank M. Schaner for technical drawings, construction and design. We thank M. Schwegel for a Matlab code to post-process experimental data.","related_material":{"record":[{"status":"public","id":"12726","relation":"dissertation_contains"},{"status":"public","id":"14530","relation":"dissertation_contains"},{"status":"public","id":"7258","relation":"dissertation_contains"}]},"project":[{"call_identifier":"FP7","_id":"25152F3A-B435-11E9-9278-68D0E5697425","grant_number":"306589","name":"Decoding the complexity of turbulence at its origin"},{"name":"Eliminating turbulence in oil pipelines","grant_number":"737549","_id":"25104D44-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"}],"type":"journal_article","author":[{"id":"3A47AE32-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0003-4312-0179","full_name":"Kühnen, Jakob","first_name":"Jakob","last_name":"Kühnen"},{"full_name":"Song, Baofang","first_name":"Baofang","last_name":"Song"},{"orcid":"0000-0001-5227-4271","id":"40315C30-F248-11E8-B48F-1D18A9856A87","full_name":"Scarselli, Davide","first_name":"Davide","last_name":"Scarselli"},{"id":"3EA1010E-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0003-0423-5010","last_name":"Budanur","full_name":"Budanur, Nazmi B","first_name":"Nazmi B"},{"last_name":"Riedl","full_name":"Riedl, Michael","first_name":"Michael","id":"3BE60946-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0003-4844-6311"},{"last_name":"Willis","first_name":"Ashley","full_name":"Willis, Ashley"},{"last_name":"Avila","first_name":"Marc","full_name":"Avila, Marc"},{"id":"3A374330-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0003-2057-2754","last_name":"Hof","first_name":"Björn","full_name":"Hof, Björn"}],"day":"08","title":"Destabilizing turbulence in pipe flow","ec_funded":1,"citation":{"short":"J. Kühnen, B. Song, D. Scarselli, N.B. Budanur, M. Riedl, A. Willis, M. Avila, B. Hof, Nature Physics 14 (2018) 386–390.","apa":"Kühnen, J., Song, B., Scarselli, D., Budanur, N. B., Riedl, M., Willis, A., … Hof, B. (2018). Destabilizing turbulence in pipe flow. <i>Nature Physics</i>. Nature Publishing Group. <a href=\"https://doi.org/10.1038/s41567-017-0018-3\">https://doi.org/10.1038/s41567-017-0018-3</a>","ama":"Kühnen J, Song B, Scarselli D, et al. Destabilizing turbulence in pipe flow. <i>Nature Physics</i>. 2018;14:386-390. doi:<a href=\"https://doi.org/10.1038/s41567-017-0018-3\">10.1038/s41567-017-0018-3</a>","ieee":"J. Kühnen <i>et al.</i>, “Destabilizing turbulence in pipe flow,” <i>Nature Physics</i>, vol. 14. Nature Publishing Group, pp. 386–390, 2018.","ista":"Kühnen J, Song B, Scarselli D, Budanur NB, Riedl M, Willis A, Avila M, Hof B. 2018. Destabilizing turbulence in pipe flow. Nature Physics. 14, 386–390.","chicago":"Kühnen, Jakob, Baofang Song, Davide Scarselli, Nazmi B Budanur, Michael Riedl, Ashley Willis, Marc Avila, and Björn Hof. “Destabilizing Turbulence in Pipe Flow.” <i>Nature Physics</i>. Nature Publishing Group, 2018. <a href=\"https://doi.org/10.1038/s41567-017-0018-3\">https://doi.org/10.1038/s41567-017-0018-3</a>.","mla":"Kühnen, Jakob, et al. “Destabilizing Turbulence in Pipe Flow.” <i>Nature Physics</i>, vol. 14, Nature Publishing Group, 2018, pp. 386–90, doi:<a href=\"https://doi.org/10.1038/s41567-017-0018-3\">10.1038/s41567-017-0018-3</a>."},"intvolume":"        14","status":"public","department":[{"_id":"BjHo"}],"quality_controlled":"1","publication":"Nature Physics","isi":1,"publisher":"Nature Publishing Group","date_created":"2018-12-11T11:46:36Z","month":"01","page":"386-390","date_updated":"2024-03-25T23:30:20Z","user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","external_id":{"isi":["000429434100020"]},"scopus_import":"1","year":"2018","oa_version":"Preprint","publist_id":"7360","volume":14,"oa":1,"main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/1711.06543"}],"publication_status":"published","_id":"461","date_published":"2018-01-08T00:00:00Z","abstract":[{"text":"Turbulence is the major cause of friction losses in transport processes and it is responsible for a drastic drag increase in flows over bounding surfaces. While much effort is invested into developing ways to control and reduce turbulence intensities, so far no methods exist to altogether eliminate turbulence if velocities are sufficiently large. We demonstrate for pipe flow that appropriate distortions to the velocity profile lead to a complete collapse of turbulence and subsequently friction losses are reduced by as much as 90%. Counterintuitively, the return to laminar motion is accomplished by initially increasing turbulence intensities or by transiently amplifying wall shear. Since neither the Reynolds number nor the shear stresses decrease (the latter often increase), these measures are not indicative of turbulence collapse. Instead, an amplification mechanism                      measuring the interaction between eddies and the mean shear is found to set a threshold below which turbulence is suppressed beyond recovery.","lang":"eng"}],"article_processing_charge":"No"},{"language":[{"iso":"eng"}],"doi":"10.1016/j.jmmm.2017.12.073","ddc":["530"],"acknowledgement":"S.Altmeyer is a Serra Húnter Fellow","day":"15","type":"journal_article","author":[{"orcid":"0000-0001-5964-0203","id":"2EE67FDC-F248-11E8-B48F-1D18A9856A87","last_name":"Altmeyer","first_name":"Sebastian","full_name":"Altmeyer, Sebastian"}],"citation":{"chicago":"Altmeyer, Sebastian. “Non-Linear Dynamics and Alternating ‘Flip’ Solutions in Ferrofluidic Taylor-Couette Flow.” <i>Journal of Magnetism and Magnetic Materials</i>. Elsevier, 2018. <a href=\"https://doi.org/10.1016/j.jmmm.2017.12.073\">https://doi.org/10.1016/j.jmmm.2017.12.073</a>.","ieee":"S. Altmeyer, “Non-linear dynamics and alternating ‘flip’ solutions in ferrofluidic Taylor-Couette flow,” <i>Journal of Magnetism and Magnetic Materials</i>, vol. 452. Elsevier, pp. 427–441, 2018.","ista":"Altmeyer S. 2018. Non-linear dynamics and alternating ‘flip’ solutions in ferrofluidic Taylor-Couette flow. Journal of Magnetism and Magnetic Materials. 452, 427–441.","mla":"Altmeyer, Sebastian. “Non-Linear Dynamics and Alternating ‘Flip’ Solutions in Ferrofluidic Taylor-Couette Flow.” <i>Journal of Magnetism and Magnetic Materials</i>, vol. 452, Elsevier, 2018, pp. 427–41, doi:<a href=\"https://doi.org/10.1016/j.jmmm.2017.12.073\">10.1016/j.jmmm.2017.12.073</a>.","short":"S. Altmeyer, Journal of Magnetism and Magnetic Materials 452 (2018) 427–441.","ama":"Altmeyer S. Non-linear dynamics and alternating ‘flip’ solutions in ferrofluidic Taylor-Couette flow. <i>Journal of Magnetism and Magnetic Materials</i>. 2018;452:427-441. doi:<a href=\"https://doi.org/10.1016/j.jmmm.2017.12.073\">10.1016/j.jmmm.2017.12.073</a>","apa":"Altmeyer, S. (2018). Non-linear dynamics and alternating ‘flip’ solutions in ferrofluidic Taylor-Couette flow. <i>Journal of Magnetism and Magnetic Materials</i>. Elsevier. <a href=\"https://doi.org/10.1016/j.jmmm.2017.12.073\">https://doi.org/10.1016/j.jmmm.2017.12.073</a>"},"title":"Non-linear dynamics and alternating ‘flip’ solutions in ferrofluidic Taylor-Couette flow","quality_controlled":"1","department":[{"_id":"BjHo"}],"publication":"Journal of Magnetism and Magnetic Materials","intvolume":"       452","status":"public","publisher":"Elsevier","isi":1,"month":"04","date_created":"2018-12-11T11:46:56Z","page":"427 - 441","user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","date_updated":"2023-09-13T09:03:44Z","external_id":{"isi":["000425547700061"]},"scopus_import":"1","publist_id":"7297","article_type":"original","has_accepted_license":"1","year":"2018","oa_version":"Submitted Version","file_date_updated":"2020-07-14T12:46:37Z","volume":452,"publication_status":"published","oa":1,"file":[{"file_size":17309535,"creator":"dernst","file_name":"2018_Magnetism_Altmeyer.pdf","access_level":"open_access","date_updated":"2020-07-14T12:46:37Z","checksum":"431f5cd4a628d7ca21161f82b14ccb4f","relation":"main_file","file_id":"7838","content_type":"application/pdf","date_created":"2020-05-14T14:41:17Z"}],"date_published":"2018-04-15T00:00:00Z","_id":"519","abstract":[{"lang":"eng","text":"This study treats with the influence of a symmetry-breaking transversal magnetic field on the nonlinear dynamics of ferrofluidic Taylor-Couette flow – flow confined between two concentric independently rotating cylinders. We detected alternating ‘flip’ solutions which are flow states featuring typical characteristics of slow-fast-dynamics in dynamical systems. The flip corresponds to a temporal change in the axial wavenumber and we find them to appear either as pure 2-fold axisymmetric (due to the symmetry-breaking nature of the applied transversal magnetic field) or involving non-axisymmetric, helical modes in its interim solution. The latter ones show features of typical ribbon solutions. In any case the flip solutions have a preferential first axial wavenumber which corresponds to the more stable state (slow dynamics) and second axial wavenumber, corresponding to the short appearing more unstable state (fast dynamics). However, in both cases the flip time grows exponential with increasing the magnetic field strength before the flip solutions, living on 2-tori invariant manifolds, cease to exist, with lifetime going to infinity. Further we show that ferrofluidic flow turbulence differ from the classical, ordinary (usually at high Reynolds number) turbulence. The applied magnetic field hinders the free motion of ferrofluid partials and therefore smoothen typical turbulent quantities and features so that speaking of mildly chaotic dynamics seems to be a more appropriate expression for the observed motion. "}],"article_processing_charge":"No"}]