[{"quality_controlled":"1","file_date_updated":"2021-08-03T09:53:28Z","publisher":"Cambridge University Press","article_type":"original","_id":"9467","license":"https://creativecommons.org/licenses/by/4.0/","scopus_import":"1","author":[{"full_name":"Marensi, Elena","first_name":"Elena","last_name":"Marensi","id":"0BE7553A-1004-11EA-B805-18983DDC885E"},{"first_name":"Shuisheng","last_name":"He","full_name":"He, Shuisheng"},{"full_name":"Willis, Ashley P.","last_name":"Willis","first_name":"Ashley P."}],"publication_status":"published","date_created":"2021-06-06T22:01:30Z","department":[{"_id":"BjHo"}],"article_processing_charge":"Yes (via OA deal)","title":"Suppression of turbulence and travelling waves in a vertical heated pipe","intvolume":"       919","acknowledgement":"The anonymous referees are kindly acknowledged for their useful suggestions andcomments.","volume":919,"ddc":["530"],"date_updated":"2023-08-08T13:58:41Z","year":"2021","citation":{"apa":"Marensi, E., He, S., &#38; Willis, A. P. (2021). Suppression of turbulence and travelling waves in a vertical heated pipe. <i>Journal of Fluid Mechanics</i>. Cambridge University Press. <a href=\"https://doi.org/10.1017/jfm.2021.371\">https://doi.org/10.1017/jfm.2021.371</a>","ama":"Marensi E, He S, Willis AP. Suppression of turbulence and travelling waves in a vertical heated pipe. <i>Journal of Fluid Mechanics</i>. 2021;919. doi:<a href=\"https://doi.org/10.1017/jfm.2021.371\">10.1017/jfm.2021.371</a>","chicago":"Marensi, Elena, Shuisheng He, and Ashley P. Willis. “Suppression of Turbulence and Travelling Waves in a Vertical Heated Pipe.” <i>Journal of Fluid Mechanics</i>. Cambridge University Press, 2021. <a href=\"https://doi.org/10.1017/jfm.2021.371\">https://doi.org/10.1017/jfm.2021.371</a>.","ieee":"E. Marensi, S. He, and A. P. Willis, “Suppression of turbulence and travelling waves in a vertical heated pipe,” <i>Journal of Fluid Mechanics</i>, vol. 919. Cambridge University Press, 2021.","mla":"Marensi, Elena, et al. “Suppression of Turbulence and Travelling Waves in a Vertical Heated Pipe.” <i>Journal of Fluid Mechanics</i>, vol. 919, A17, Cambridge University Press, 2021, doi:<a href=\"https://doi.org/10.1017/jfm.2021.371\">10.1017/jfm.2021.371</a>.","short":"E. Marensi, S. He, A.P. Willis, Journal of Fluid Mechanics 919 (2021).","ista":"Marensi E, He S, Willis AP. 2021. Suppression of turbulence and travelling waves in a vertical heated pipe. Journal of Fluid Mechanics. 919, A17."},"isi":1,"external_id":{"arxiv":["2008.13486"],"isi":["000653785000001"]},"arxiv":1,"doi":"10.1017/jfm.2021.371","day":"25","abstract":[{"lang":"eng","text":"Turbulence in the flow of fluid through a pipe can be suppressed by buoyancy forces. As the suppression of turbulence leads to severe heat transfer deterioration, this is an important and undesirable phenomenon in both heating and cooling applications. Vertical flow is often considered, as the axial buoyancy force can help drive the flow. With heating measured by the buoyancy parameter 𝐶, our direct numerical simulations show that shear-driven turbulence may either be completely laminarised or it transitions to a relatively quiescent convection-driven state. Buoyancy forces cause a flattening of the base flow profile, which in isothermal pipe flow has recently been linked to complete suppression of turbulence (Kühnen et al., Nat. Phys., vol. 14, 2018, pp. 386–390), and the flattened laminar base profile has enhanced nonlinear stability (Marensi et al., J. Fluid Mech., vol. 863, 2019, pp. 50–875). In agreement with these findings, the nonlinear lower-branch travelling-wave solution analysed here, which is believed to mediate transition to turbulence in isothermal pipe flow, is shown to be suppressed by buoyancy. A linear instability of the laminar base flow is responsible for the appearance of the relatively quiescent convection driven state for 𝐶≳4 across the range of Reynolds numbers considered. In the suppression of turbulence, however, i.e. in the transition from turbulence, we find clearer association with the analysis of He et al. (J. Fluid Mech., vol. 809, 2016, pp. 31–71) than with the above dynamical systems approach, which describes better the transition to turbulence. The laminarisation criterion He et al. propose, based on an apparent Reynolds number of the flow as measured by its driving pressure gradient, is found to capture the critical 𝐶=𝐶𝑐𝑟(𝑅𝑒) above which the flow will be laminarised or switch to the convection-driven type. Our analysis suggests that it is the weakened rolls, rather than the streaks, which appear to be critical for laminarisation."}],"language":[{"iso":"eng"}],"publication":"Journal of Fluid Mechanics","has_accepted_license":"1","oa_version":"Published Version","month":"07","article_number":"A17","file":[{"file_size":4087358,"checksum":"867ad077e45c181c2c5ec1311ba27c41","date_created":"2021-08-03T09:53:28Z","content_type":"application/pdf","file_name":"2021_JournalFluidMechanics_Marensi.pdf","date_updated":"2021-08-03T09:53:28Z","relation":"main_file","success":1,"access_level":"open_access","creator":"kschuh","file_id":"9766"}],"status":"public","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","short":"CC BY (4.0)","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)"},"date_published":"2021-07-25T00:00:00Z","type":"journal_article","publication_identifier":{"eissn":["14697645"],"issn":["00221120"]},"oa":1},{"file_date_updated":"2020-07-14T12:48:08Z","quality_controlled":"1","article_type":"original","publisher":"Cambridge University Press","author":[{"full_name":"Paranjape, Chaitanya S","last_name":"Paranjape","first_name":"Chaitanya S","id":"3D85B7C4-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Yohann","last_name":"Duguet","full_name":"Duguet, Yohann"},{"id":"3A374330-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0003-2057-2754","full_name":"Hof, Björn","first_name":"Björn","last_name":"Hof"}],"scopus_import":"1","license":"https://creativecommons.org/licenses/by-nc-sa/4.0/","_id":"8043","intvolume":"       897","title":"Oblique stripe solutions of channel flow","date_created":"2020-06-29T07:59:35Z","department":[{"_id":"BjHo"}],"article_processing_charge":"Yes (via OA deal)","publication_status":"published","ddc":["530"],"volume":897,"acknowledgement":"The authors thank S. Zammert and B. Budanur for useful discussions. J. F. Gibson is gratefully acknowledged for the development and the maintenance of the code Channelflow. Y.D. would like to thank P. Schlatter and D. S. Henningson for an early collaboration on a similar topic in the case of plane Couette flow during the years 2008–2013.","external_id":{"isi":["000539132300001"]},"isi":1,"year":"2020","citation":{"mla":"Paranjape, Chaitanya S., et al. “Oblique Stripe Solutions of Channel Flow.” <i>Journal of Fluid Mechanics</i>, vol. 897, A7, Cambridge University Press, 2020, doi:<a href=\"https://doi.org/10.1017/jfm.2020.322\">10.1017/jfm.2020.322</a>.","short":"C.S. Paranjape, Y. Duguet, B. Hof, Journal of Fluid Mechanics 897 (2020).","ista":"Paranjape CS, Duguet Y, Hof B. 2020. Oblique stripe solutions of channel flow. Journal of Fluid Mechanics. 897, A7.","ama":"Paranjape CS, Duguet Y, Hof B. Oblique stripe solutions of channel flow. <i>Journal of Fluid Mechanics</i>. 2020;897. doi:<a href=\"https://doi.org/10.1017/jfm.2020.322\">10.1017/jfm.2020.322</a>","apa":"Paranjape, C. S., Duguet, Y., &#38; Hof, B. (2020). Oblique stripe solutions of channel flow. <i>Journal of Fluid Mechanics</i>. Cambridge University Press. <a href=\"https://doi.org/10.1017/jfm.2020.322\">https://doi.org/10.1017/jfm.2020.322</a>","chicago":"Paranjape, Chaitanya S, Yohann Duguet, and Björn Hof. “Oblique Stripe Solutions of Channel Flow.” <i>Journal of Fluid Mechanics</i>. Cambridge University Press, 2020. <a href=\"https://doi.org/10.1017/jfm.2020.322\">https://doi.org/10.1017/jfm.2020.322</a>.","ieee":"C. S. Paranjape, Y. Duguet, and B. Hof, “Oblique stripe solutions of channel flow,” <i>Journal of Fluid Mechanics</i>, vol. 897. Cambridge University Press, 2020."},"date_updated":"2023-08-22T07:48:02Z","abstract":[{"text":"With decreasing Reynolds number, Re, turbulence in channel flow becomes spatio-temporally intermittent and self-organises into solitary stripes oblique to the mean flow direction. We report here the existence of localised nonlinear travelling wave solutions of the Navier–Stokes equations possessing this obliqueness property. Such solutions are identified numerically using edge tracking coupled with arclength continuation. All solutions emerge in saddle-node bifurcations at values of Re lower than the non-localised solutions. Relative periodic orbit solutions bifurcating from branches of travelling waves have also been computed. A complete parametric study is performed, including their stability, the investigation of their large-scale flow, and the robustness to changes of the numerical domain.","lang":"eng"}],"day":"25","doi":"10.1017/jfm.2020.322","language":[{"iso":"eng"}],"has_accepted_license":"1","publication":"Journal of Fluid Mechanics","article_number":"A7","month":"08","oa_version":"Published Version","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","status":"public","file":[{"relation":"main_file","access_level":"open_access","creator":"cziletti","file_id":"8070","checksum":"3f487bf6d9286787096306eaa18702e8","file_size":767873,"date_created":"2020-06-30T08:37:37Z","content_type":"application/pdf","file_name":"2020_JournalOfFluidMech_Paranjape.pdf","date_updated":"2020-07-14T12:48:08Z"}],"type":"journal_article","date_published":"2020-08-25T00:00:00Z","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode","name":"Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)","image":"/images/cc_by_nc_sa.png","short":"CC BY-NC-SA (4.0)"},"oa":1,"publication_identifier":{"eissn":["14697645"],"issn":["00221120"]}},{"author":[{"id":"40315C30-F248-11E8-B48F-1D18A9856A87","first_name":"Davide","last_name":"Scarselli","orcid":"0000-0001-5227-4271","full_name":"Scarselli, Davide"},{"id":"3A47AE32-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0003-4312-0179","full_name":"Kühnen, Jakob","first_name":"Jakob","last_name":"Kühnen"},{"first_name":"Björn","last_name":"Hof","orcid":"0000-0003-2057-2754","full_name":"Hof, Björn","id":"3A374330-F248-11E8-B48F-1D18A9856A87"}],"scopus_import":"1","_id":"6228","intvolume":"       867","title":"Relaminarising pipe flow by wall movement","department":[{"_id":"BjHo"}],"date_created":"2019-04-07T21:59:14Z","article_processing_charge":"No","publication_status":"published","ec_funded":1,"quality_controlled":"1","page":"934-948","publisher":"Cambridge University Press","external_id":{"arxiv":["1807.05357"],"isi":["000462606100001"]},"isi":1,"year":"2019","citation":{"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>.","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>","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>","ista":"Scarselli D, Kühnen J, Hof B. 2019. Relaminarising pipe flow by wall movement. Journal of Fluid Mechanics. 867, 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>.","short":"D. Scarselli, J. Kühnen, B. Hof, Journal of Fluid Mechanics 867 (2019) 934–948."},"date_updated":"2024-03-25T23:30:20Z","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."}],"day":"25","doi":"10.1017/jfm.2019.191","arxiv":1,"volume":867,"publication":"Journal of Fluid Mechanics","month":"05","project":[{"name":"Decoding the complexity of turbulence at its origin","grant_number":"306589","call_identifier":"FP7","_id":"25152F3A-B435-11E9-9278-68D0E5697425"},{"call_identifier":"H2020","_id":"25104D44-B435-11E9-9278-68D0E5697425","name":"Eliminating turbulence in oil pipelines","grant_number":"737549"}],"oa_version":"Preprint","language":[{"iso":"eng"}],"type":"journal_article","date_published":"2019-05-25T00:00:00Z","oa":1,"publication_identifier":{"issn":["00221120"],"eissn":["14697645"]},"related_material":{"record":[{"status":"public","id":"7258","relation":"dissertation_contains"}],"link":[{"url":"https://doi.org/10.1017/jfm.2019.191","relation":"supplementary_material"}]},"status":"public","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","main_file_link":[{"url":"https://arxiv.org/abs/1807.05357","open_access":"1"}]}]