[{"oa":1,"language":[{"iso":"eng"}],"citation":{"short":"G.H. Choueiri, B. Suri, J. Merrin, M. Serbyn, B. Hof, N.B. Budanur, Chaos: An Interdisciplinary Journal of Nonlinear Science 32 (2022).","ieee":"G. H. Choueiri, B. Suri, J. Merrin, M. Serbyn, B. Hof, and N. B. Budanur, “Crises and chaotic scattering in hydrodynamic pilot-wave experiments,” <i>Chaos: An Interdisciplinary Journal of Nonlinear Science</i>, vol. 32, no. 9. AIP Publishing, 2022.","ama":"Choueiri GH, Suri B, Merrin J, Serbyn M, Hof B, Budanur NB. Crises and chaotic scattering in hydrodynamic pilot-wave experiments. <i>Chaos: An Interdisciplinary Journal of Nonlinear Science</i>. 2022;32(9). doi:<a href=\"https://doi.org/10.1063/5.0102904\">10.1063/5.0102904</a>","mla":"Choueiri, George H., et al. “Crises and Chaotic Scattering in Hydrodynamic Pilot-Wave Experiments.” <i>Chaos: An Interdisciplinary Journal of Nonlinear Science</i>, vol. 32, no. 9, 093138, AIP Publishing, 2022, doi:<a href=\"https://doi.org/10.1063/5.0102904\">10.1063/5.0102904</a>.","apa":"Choueiri, G. H., Suri, B., Merrin, J., Serbyn, M., Hof, B., &#38; Budanur, N. B. (2022). Crises and chaotic scattering in hydrodynamic pilot-wave experiments. <i>Chaos: An Interdisciplinary Journal of Nonlinear Science</i>. AIP Publishing. <a href=\"https://doi.org/10.1063/5.0102904\">https://doi.org/10.1063/5.0102904</a>","ista":"Choueiri GH, Suri B, Merrin J, Serbyn M, Hof B, Budanur NB. 2022. Crises and chaotic scattering in hydrodynamic pilot-wave experiments. Chaos: An Interdisciplinary Journal of Nonlinear Science. 32(9), 093138.","chicago":"Choueiri, George H, Balachandra Suri, Jack Merrin, Maksym Serbyn, Björn Hof, and Nazmi B Budanur. “Crises and Chaotic Scattering in Hydrodynamic Pilot-Wave Experiments.” <i>Chaos: An Interdisciplinary Journal of Nonlinear Science</i>. AIP Publishing, 2022. <a href=\"https://doi.org/10.1063/5.0102904\">https://doi.org/10.1063/5.0102904</a>."},"issue":"9","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","arxiv":1,"month":"09","department":[{"_id":"MaSe"},{"_id":"BjHo"},{"_id":"NanoFab"}],"article_number":"093138","file":[{"relation":"main_file","checksum":"17881eff8b21969359a2dd64620120ba","file_name":"2022_Chaos_Choueiri.pdf","success":1,"content_type":"application/pdf","access_level":"open_access","file_id":"12445","file_size":3209644,"date_created":"2023-01-30T09:41:12Z","date_updated":"2023-01-30T09:41:12Z","creator":"dernst"}],"has_accepted_license":"1","tmp":{"name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","short":"CC BY (4.0)"},"abstract":[{"text":"Theoretical foundations of chaos have been predominantly laid out for finite-dimensional dynamical systems, such as the three-body problem in classical mechanics and the Lorenz model in dissipative systems. In contrast, many real-world chaotic phenomena, e.g., weather, arise in systems with many (formally infinite) degrees of freedom, which limits direct quantitative analysis of such systems using chaos theory. In the present work, we demonstrate that the hydrodynamic pilot-wave systems offer a bridge between low- and high-dimensional chaotic phenomena by allowing for a systematic study of how the former connects to the latter. Specifically, we present experimental results, which show the formation of low-dimensional chaotic attractors upon destabilization of regular dynamics and a final transition to high-dimensional chaos via the merging of distinct chaotic regions through a crisis bifurcation. Moreover, we show that the post-crisis dynamics of the system can be rationalized as consecutive scatterings from the nonattracting chaotic sets with lifetimes following exponential distributions. ","lang":"eng"}],"intvolume":"        32","file_date_updated":"2023-01-30T09:41:12Z","publication_identifier":{"issn":["1054-1500"],"eissn":["1089-7682"]},"publication_status":"published","scopus_import":"1","day":"26","author":[{"first_name":"George H","id":"448BD5BC-F248-11E8-B48F-1D18A9856A87","full_name":"Choueiri, George H","last_name":"Choueiri"},{"first_name":"Balachandra","id":"47A5E706-F248-11E8-B48F-1D18A9856A87","full_name":"Suri, Balachandra","last_name":"Suri"},{"id":"4515C308-F248-11E8-B48F-1D18A9856A87","full_name":"Merrin, Jack","last_name":"Merrin","orcid":"0000-0001-5145-4609","first_name":"Jack"},{"last_name":"Serbyn","full_name":"Serbyn, Maksym","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","first_name":"Maksym","orcid":"0000-0002-2399-5827"},{"last_name":"Hof","id":"3A374330-F248-11E8-B48F-1D18A9856A87","full_name":"Hof, Björn","first_name":"Björn","orcid":"0000-0003-2057-2754"},{"last_name":"Budanur","id":"3EA1010E-F248-11E8-B48F-1D18A9856A87","full_name":"Budanur, Nazmi B","orcid":"0000-0003-0423-5010","first_name":"Nazmi B"}],"title":"Crises and chaotic scattering in hydrodynamic pilot-wave experiments","oa_version":"Published Version","volume":32,"date_created":"2023-01-16T09:58:16Z","article_type":"original","publication":"Chaos: An Interdisciplinary Journal of Nonlinear Science","status":"public","acknowledgement":"This work was partially funded by the Institute of Science and Technology Austria Interdisciplinary Project Committee Grant “Pilot-Wave Hydrodynamics: Chaos and Quantum Analogies.”","date_published":"2022-09-26T00:00:00Z","year":"2022","isi":1,"external_id":{"arxiv":["2206.01531"],"isi":["000861009600005"]},"keyword":["Applied Mathematics","General Physics and Astronomy","Mathematical Physics","Statistical and Nonlinear Physics"],"ddc":["530"],"quality_controlled":"1","article_processing_charge":"No","doi":"10.1063/5.0102904","publisher":"AIP Publishing","_id":"12259","date_updated":"2023-08-04T09:51:17Z","type":"journal_article"},{"author":[{"first_name":"George H","id":"448BD5BC-F248-11E8-B48F-1D18A9856A87","full_name":"Choueiri, George H","last_name":"Choueiri"},{"id":"40770848-F248-11E8-B48F-1D18A9856A87","full_name":"Lopez Alonso, Jose M","last_name":"Lopez Alonso","first_name":"Jose M","orcid":"0000-0002-0384-2022"},{"last_name":"Varshney","full_name":"Varshney, Atul","id":"2A2006B2-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-3072-5999","first_name":"Atul"},{"full_name":"Sankar, Sarath","last_name":"Sankar","first_name":"Sarath"},{"last_name":"Hof","id":"3A374330-F248-11E8-B48F-1D18A9856A87","full_name":"Hof, Björn","orcid":"0000-0003-2057-2754","first_name":"Björn"}],"day":"03","scopus_import":"1","title":"Experimental observation of the origin and structure of elastoinertial turbulence","oa_version":"Preprint","volume":118,"article_type":"original","date_created":"2021-11-17T13:24:24Z","intvolume":"       118","abstract":[{"lang":"eng","text":"Turbulence generally arises in shear flows if velocities and hence, inertial forces are sufficiently large. In striking contrast, viscoelastic fluids can exhibit disordered motion even at vanishing inertia. Intermediate between these cases, a state of chaotic motion, “elastoinertial turbulence” (EIT), has been observed in a narrow Reynolds number interval. We here determine the origin of EIT in experiments and show that characteristic EIT structures can be detected across an unexpectedly wide range of parameters. Close to onset, a pattern of chevron-shaped streaks emerges in qualitative agreement with linear and weakly nonlinear theory. However, in experiments, the dynamics remain weakly chaotic, and the instability can be traced to far lower Reynolds numbers than permitted by theory. For increasing inertia, the flow undergoes a transformation to a wall mode composed of inclined near-wall streaks and shear layers. This mode persists to what is known as the “maximum drag reduction limit,” and overall EIT is found to dominate viscoelastic flows across more than three orders of magnitude in Reynolds number."}],"publication_status":"published","publication_identifier":{"eissn":["1091-6490"],"issn":["0027-8424"]},"month":"11","arxiv":1,"department":[{"_id":"BjHo"}],"article_number":"e2102350118","oa":1,"language":[{"iso":"eng"}],"issue":"45","citation":{"short":"G.H. Choueiri, J.M. Lopez Alonso, A. Varshney, S. Sankar, B. Hof, Proceedings of the National Academy of Sciences 118 (2021).","ieee":"G. H. Choueiri, J. M. Lopez Alonso, A. Varshney, S. Sankar, and B. Hof, “Experimental observation of the origin and structure of elastoinertial turbulence,” <i>Proceedings of the National Academy of Sciences</i>, vol. 118, no. 45. National Academy of Sciences, 2021.","ama":"Choueiri GH, Lopez Alonso JM, Varshney A, Sankar S, Hof B. Experimental observation of the origin and structure of elastoinertial turbulence. <i>Proceedings of the National Academy of Sciences</i>. 2021;118(45). doi:<a href=\"https://doi.org/10.1073/pnas.2102350118\">10.1073/pnas.2102350118</a>","mla":"Choueiri, George H., et al. “Experimental Observation of the Origin and Structure of Elastoinertial Turbulence.” <i>Proceedings of the National Academy of Sciences</i>, vol. 118, no. 45, e2102350118, National Academy of Sciences, 2021, doi:<a href=\"https://doi.org/10.1073/pnas.2102350118\">10.1073/pnas.2102350118</a>.","apa":"Choueiri, G. H., Lopez Alonso, J. M., Varshney, A., Sankar, S., &#38; Hof, B. (2021). Experimental observation of the origin and structure of elastoinertial turbulence. <i>Proceedings of the National Academy of Sciences</i>. National Academy of Sciences. <a href=\"https://doi.org/10.1073/pnas.2102350118\">https://doi.org/10.1073/pnas.2102350118</a>","chicago":"Choueiri, George H, Jose M Lopez Alonso, Atul Varshney, Sarath Sankar, and Björn Hof. “Experimental Observation of the Origin and Structure of Elastoinertial Turbulence.” <i>Proceedings of the National Academy of Sciences</i>. National Academy of Sciences, 2021. <a href=\"https://doi.org/10.1073/pnas.2102350118\">https://doi.org/10.1073/pnas.2102350118</a>.","ista":"Choueiri GH, Lopez Alonso JM, Varshney A, Sankar S, Hof B. 2021. Experimental observation of the origin and structure of elastoinertial turbulence. Proceedings of the National Academy of Sciences. 118(45), e2102350118."},"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","doi":"10.1073/pnas.2102350118","article_processing_charge":"No","publisher":"National Academy of Sciences","date_updated":"2023-08-14T11:50:10Z","_id":"10299","type":"journal_article","main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/2103.00023"}],"quality_controlled":"1","isi":1,"year":"2021","external_id":{"arxiv":["2103.00023"],"isi":["000720926900019"],"pmid":[" 34732570"]},"keyword":["multidisciplinary","elastoinertial turbulence","viscoelastic flows","elastic instability","drag reduction"],"project":[{"name":"Instabilities in pulsating pipe flow of Newtonian and complex fluids","grant_number":"I04188","call_identifier":"FWF","_id":"238B8092-32DE-11EA-91FC-C7463DDC885E"}],"publication":"Proceedings of the National Academy of Sciences","status":"public","pmid":1,"acknowledgement":"We thank Y. Dubief, R. Kerswell, E. Marensi, V. Shankar, V. Steinberg, and V. Terrapon for discussions and helpful comments. A.V. and B.H. acknowledge funding from the Austrian Science Fund, grant I4188-N30, within the Deutsche Forschungsgemeinschaft research unit FOR 2688.","date_published":"2021-11-03T00:00:00Z"},{"external_id":{"arxiv":["1808.04080"],"isi":["000475349900001"]},"year":"2019","isi":1,"status":"public","publication":"Journal of Fluid Mechanics","date_published":"2019-09-10T00:00:00Z","publisher":"CUP","doi":"10.1017/jfm.2019.486","article_processing_charge":"No","type":"journal_article","date_updated":"2023-09-06T15:36:36Z","_id":"7397","page":"699-719","quality_controlled":"1","main_file_link":[{"url":"https://arxiv.org/abs/1808.04080","open_access":"1"}],"month":"09","arxiv":1,"department":[{"_id":"BjHo"}],"language":[{"iso":"eng"}],"oa":1,"user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","citation":{"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>","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>.","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>.","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.","short":"J.M. Lopez Alonso, G.H. Choueiri, B. Hof, Journal of Fluid Mechanics 874 (2019) 699–719.","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>"},"title":"Dynamics of viscoelastic pipe flow at low Reynolds numbers in the maximum drag reduction limit","oa_version":"Preprint","author":[{"full_name":"Lopez Alonso, Jose M","id":"40770848-F248-11E8-B48F-1D18A9856A87","last_name":"Lopez Alonso","first_name":"Jose M","orcid":"0000-0002-0384-2022"},{"last_name":"Choueiri","id":"448BD5BC-F248-11E8-B48F-1D18A9856A87","full_name":"Choueiri, George H","first_name":"George H"},{"orcid":"0000-0003-2057-2754","first_name":"Björn","id":"3A374330-F248-11E8-B48F-1D18A9856A87","full_name":"Hof, Björn","last_name":"Hof"}],"day":"10","scopus_import":"1","article_type":"original","date_created":"2020-01-29T16:05:19Z","volume":874,"intvolume":"       874","abstract":[{"lang":"eng","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)."}],"publication_identifier":{"eissn":["1469-7645"],"issn":["0022-1120"]},"publication_status":"published"},{"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","issue":"11","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>","short":"N. Agrawal, G.H. Choueiri, B. Hof, Physical Review Letters 122 (2019).","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.","ista":"Agrawal N, Choueiri GH, Hof B. 2019. Transition to turbulence in particle laden flows. Physical Review Letters. 122(11), 114502.","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>.","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>.","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>"},"language":[{"iso":"eng"}],"oa":1,"article_number":"114502","department":[{"_id":"BjHo"}],"arxiv":1,"month":"03","publication_status":"published","publication_identifier":{"eissn":["10797114"],"issn":["00319007"]},"intvolume":"       122","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."}],"date_created":"2019-03-31T21:59:12Z","volume":122,"title":"Transition to turbulence in particle laden flows","oa_version":"Preprint","author":[{"id":"469E6004-F248-11E8-B48F-1D18A9856A87","full_name":"Agrawal, Nishchal","last_name":"Agrawal","first_name":"Nishchal"},{"first_name":"George H","last_name":"Choueiri","id":"448BD5BC-F248-11E8-B48F-1D18A9856A87","full_name":"Choueiri, George H"},{"first_name":"Björn","orcid":"0000-0003-2057-2754","last_name":"Hof","id":"3A374330-F248-11E8-B48F-1D18A9856A87","full_name":"Hof, Björn"}],"day":"22","scopus_import":"1","date_published":"2019-03-22T00:00:00Z","status":"public","publication":"Physical Review Letters","external_id":{"isi":["000461922000006"],"arxiv":["1809.06358"]},"related_material":{"record":[{"status":"public","relation":"dissertation_contains","id":"9728"}]},"year":"2019","isi":1,"quality_controlled":"1","main_file_link":[{"url":"https://arxiv.org/abs/1809.06358","open_access":"1"}],"type":"journal_article","date_updated":"2024-03-25T23:30:27Z","_id":"6189","publisher":"American Physical Society","doi":"10.1103/PhysRevLett.122.114502","article_processing_charge":"No"},{"department":[{"_id":"BjHo"}],"article_number":"124501","month":"03","citation":{"short":"G.H. Choueiri, J.M. Lopez Alonso, B. Hof, Physical Review Letters 120 (2018).","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.","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>","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>.","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>","ista":"Choueiri GH, Lopez Alonso JM, Hof B. 2018. Exceeding the asymptotic limit of polymer drag reduction. Physical Review Letters. 120(12), 124501.","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>."},"issue":"12","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","oa":1,"language":[{"iso":"eng"}],"volume":120,"date_created":"2018-12-11T11:45:51Z","day":"19","scopus_import":"1","author":[{"first_name":"George H","id":"448BD5BC-F248-11E8-B48F-1D18A9856A87","full_name":"Choueiri, George H","last_name":"Choueiri"},{"first_name":"Jose M","orcid":"0000-0002-0384-2022","last_name":"Lopez Alonso","full_name":"Lopez Alonso, Jose M","id":"40770848-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Björn","orcid":"0000-0003-2057-2754","id":"3A374330-F248-11E8-B48F-1D18A9856A87","full_name":"Hof, Björn","last_name":"Hof"}],"title":"Exceeding the asymptotic limit of polymer drag reduction","oa_version":"Preprint","publication_status":"published","acknowledged_ssus":[{"_id":"SSU"}],"intvolume":"       120","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."}],"publist_id":"7537","isi":1,"year":"2018","external_id":{"isi":["000427804000005"]},"ec_funded":1,"acknowledgement":"The authors thank Philipp Maier and the IST Austria workshop for their dedicated technical support.","date_published":"2018-03-19T00:00:00Z","status":"public","publication":"Physical Review Letters","project":[{"grant_number":"291734","name":"International IST Postdoc Fellowship Programme","call_identifier":"FP7","_id":"25681D80-B435-11E9-9278-68D0E5697425"},{"_id":"25152F3A-B435-11E9-9278-68D0E5697425","call_identifier":"FP7","grant_number":"306589","name":"Decoding the complexity of turbulence at its origin"}],"_id":"328","date_updated":"2023-10-10T13:27:44Z","type":"journal_article","article_processing_charge":"No","doi":"10.1103/PhysRevLett.120.124501","publisher":"American Physical Society","main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/1703.06271"}],"quality_controlled":"1"}]