Square cylinder in the interface of two different velocity streams

We investigate the incompressible flow past a square cylinder immersed in the wake of an upstream nearby splitter plate separating two streams of different velocity. The bottom stream Reynolds number, based on the square side, ReB=56 is kept constant while the top-to-bottom Reynolds numbers ratio R=...

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Autores: Elmansy, Reda Mohamed Yousyf Abdallah|||0000-0002-7484-317X, Sarwar, Wasim, Bergadà Granyó, Josep Maria|||0000-0003-1787-7960, Mellibovsky Elstein, Fernando|||0000-0003-0497-9052
Tipo de recurso: artículo
Fecha de publicación:2022
País:España
Institución:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/375844
Acceso en línea:https://hdl.handle.net/2117/375844
https://dx.doi.org/10.1017/jfm.2022.821
Access Level:acceso abierto
Palabra clave:Fluid mechanics
Mecànica de fluids
Àrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids
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spelling Square cylinder in the interface of two different velocity streamsElmansy, Reda Mohamed Yousyf Abdallah|||0000-0002-7484-317XSarwar, WasimBergadà Granyó, Josep Maria|||0000-0003-1787-7960Mellibovsky Elstein, Fernando|||0000-0003-0497-9052Fluid mechanicsMecànica de fluidsÀrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluidsWe investigate the incompressible flow past a square cylinder immersed in the wake of an upstream nearby splitter plate separating two streams of different velocity. The bottom stream Reynolds number, based on the square side, ReB=56 is kept constant while the top-to-bottom Reynolds numbers ratio R=ReT/ReB is increased in the range R¿[1,6.5] , corresponding to a coupled variation of the bulk Reynolds number Re=(ReT+ReB)/2¿[56,210] and an equivalent non-dimensional shear parameter K=2(R-1)/(R+1)¿[0,1.4667] . The onset of vortex shedding is pushed to higher Re as compared with the square cylinder in the classic configuration. The advent of three dimensionality is triggered by a mode-C-type instability, much as reported for open circular rings and square cylinders placed at an incidence. The domain of minimal spanwise-periodic extension that is capable of sustaining spatiotemporally chaotic dynamics, namely one accommodating about twice the wavelength of the dominant eigenmode, has been chosen for the analysis of the wake transition regime. The path towards spatiotemporal chaos is, in this minimal domain, initiated with a modulational period-doubling tertiary bifurcation that also doubles the spanwise periodicity. At slightly higher values of R , the flow has become spatiotemporally chaotic, but the main features of mode C are still clearly distinguishable. Although some of the nonlinear solutions found along the wake transition regime employing the minimal domain might indeed be unstable to long wavelength disturbances, they still are solutions of the infinite cylinder problem and are apt to play a relevant role in the inception of spatiotemporally chaotic dynamicsPeer Reviewed20222022-10-2420222022-11-08journal articlehttp://purl.org/coar/resource_type/c_6501AMhttp://purl.org/coar/version/c_ab4af688f83e57aainfo:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/375844https://dx.doi.org/10.1017/jfm.2022.821reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/3758442026-05-27T15:37:01Z
dc.title.none.fl_str_mv Square cylinder in the interface of two different velocity streams
title Square cylinder in the interface of two different velocity streams
spellingShingle Square cylinder in the interface of two different velocity streams
Elmansy, Reda Mohamed Yousyf Abdallah|||0000-0002-7484-317X
Fluid mechanics
Mecànica de fluids
Àrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids
title_short Square cylinder in the interface of two different velocity streams
title_full Square cylinder in the interface of two different velocity streams
title_fullStr Square cylinder in the interface of two different velocity streams
title_full_unstemmed Square cylinder in the interface of two different velocity streams
title_sort Square cylinder in the interface of two different velocity streams
dc.creator.none.fl_str_mv Elmansy, Reda Mohamed Yousyf Abdallah|||0000-0002-7484-317X
Sarwar, Wasim
Bergadà Granyó, Josep Maria|||0000-0003-1787-7960
Mellibovsky Elstein, Fernando|||0000-0003-0497-9052
author Elmansy, Reda Mohamed Yousyf Abdallah|||0000-0002-7484-317X
author_facet Elmansy, Reda Mohamed Yousyf Abdallah|||0000-0002-7484-317X
Sarwar, Wasim
Bergadà Granyó, Josep Maria|||0000-0003-1787-7960
Mellibovsky Elstein, Fernando|||0000-0003-0497-9052
author_role author
author2 Sarwar, Wasim
Bergadà Granyó, Josep Maria|||0000-0003-1787-7960
Mellibovsky Elstein, Fernando|||0000-0003-0497-9052
author2_role author
author
author
dc.subject.none.fl_str_mv Fluid mechanics
Mecànica de fluids
Àrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids
topic Fluid mechanics
Mecànica de fluids
Àrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids
description We investigate the incompressible flow past a square cylinder immersed in the wake of an upstream nearby splitter plate separating two streams of different velocity. The bottom stream Reynolds number, based on the square side, ReB=56 is kept constant while the top-to-bottom Reynolds numbers ratio R=ReT/ReB is increased in the range R¿[1,6.5] , corresponding to a coupled variation of the bulk Reynolds number Re=(ReT+ReB)/2¿[56,210] and an equivalent non-dimensional shear parameter K=2(R-1)/(R+1)¿[0,1.4667] . The onset of vortex shedding is pushed to higher Re as compared with the square cylinder in the classic configuration. The advent of three dimensionality is triggered by a mode-C-type instability, much as reported for open circular rings and square cylinders placed at an incidence. The domain of minimal spanwise-periodic extension that is capable of sustaining spatiotemporally chaotic dynamics, namely one accommodating about twice the wavelength of the dominant eigenmode, has been chosen for the analysis of the wake transition regime. The path towards spatiotemporal chaos is, in this minimal domain, initiated with a modulational period-doubling tertiary bifurcation that also doubles the spanwise periodicity. At slightly higher values of R , the flow has become spatiotemporally chaotic, but the main features of mode C are still clearly distinguishable. Although some of the nonlinear solutions found along the wake transition regime employing the minimal domain might indeed be unstable to long wavelength disturbances, they still are solutions of the infinite cylinder problem and are apt to play a relevant role in the inception of spatiotemporally chaotic dynamics
publishDate 2022
dc.date.none.fl_str_mv 2022
2022-10-24
2022
2022-11-08
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
AM
http://purl.org/coar/version/c_ab4af688f83e57aa
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/375844
https://dx.doi.org/10.1017/jfm.2022.821
url https://hdl.handle.net/2117/375844
https://dx.doi.org/10.1017/jfm.2022.821
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivatives 4.0 International
http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivatives 4.0 International
http://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:UPCommons. Portal del coneixement obert de la UPC
instname:Universitat Politècnica de Catalunya (UPC)
instname_str Universitat Politècnica de Catalunya (UPC)
reponame_str UPCommons. Portal del coneixement obert de la UPC
collection UPCommons. Portal del coneixement obert de la UPC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,301629

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