{"department":[{"_id":"BjHo"}],"abstract":[{"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.","lang":"eng"}],"main_file_link":[{"url":"https://arxiv.org/abs/1807.05357","open_access":"1"}],"publication_status":"published","date_published":"2019-05-25T00:00:00Z","month":"05","article_processing_charge":"No","date_updated":"2024-03-25T23:30:20Z","type":"journal_article","day":"25","title":"Relaminarising pipe flow by wall movement","quality_controlled":"1","related_material":{"link":[{"url":"https://doi.org/10.1017/jfm.2019.191","relation":"supplementary_material"}],"record":[{"status":"public","id":"7258","relation":"dissertation_contains"}]},"status":"public","publisher":"Cambridge University Press","scopus_import":"1","oa":1,"oa_version":"Preprint","date_created":"2019-04-07T21:59:14Z","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","language":[{"iso":"eng"}],"_id":"6228","ec_funded":1,"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.","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.","ista":"Scarselli D, Kühnen J, Hof B. 2019. Relaminarising pipe flow by wall movement. Journal of Fluid Mechanics. 867, 934–948.","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>.","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>"},"external_id":{"isi":["000462606100001"],"arxiv":["1807.05357"]},"publication_identifier":{"issn":["00221120"],"eissn":["14697645"]},"doi":"10.1017/jfm.2019.191","page":"934-948","author":[{"orcid":"0000-0001-5227-4271","first_name":"Davide","last_name":"Scarselli","id":"40315C30-F248-11E8-B48F-1D18A9856A87","full_name":"Scarselli, Davide"},{"orcid":"0000-0003-4312-0179","full_name":"Kühnen, Jakob","id":"3A47AE32-F248-11E8-B48F-1D18A9856A87","last_name":"Kühnen","first_name":"Jakob"},{"first_name":"Björn","last_name":"Hof","full_name":"Hof, Björn","id":"3A374330-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0003-2057-2754"}],"publication":"Journal of Fluid Mechanics","project":[{"call_identifier":"FP7","_id":"25152F3A-B435-11E9-9278-68D0E5697425","name":"Decoding the complexity of turbulence at its origin","grant_number":"306589"},{"call_identifier":"H2020","_id":"25104D44-B435-11E9-9278-68D0E5697425","name":"Eliminating turbulence in oil pipelines","grant_number":"737549"}],"isi":1,"year":"2019","intvolume":"       867","volume":867}