LES-based Study of the Roughness Effects on the Wake of a Circular Cylinder from Subcritical to Transcritical Reynolds Numbers

This paper investigates the effects of surface roughness on the flow past a circular cylinder at subcritical to transcritical Reynolds numbers. Large eddy simulations of the flow for sand grain roughness of size k/D = 0.02 are performed (D is the cylinder diameter). Results show that surface roughne...

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Autores: Rodriguez, Ivette, Lehmkuhl Barba, Oriol|||0000-0002-2670-1871, Piomelli, Ugo, Chiva, Jorge, Borrell, Ricard, Oliva, Assensi
Tipo de recurso: artículo
Fecha de publicación:2017
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:2117/114903
Acceso en línea:https://hdl.handle.net/2117/114903
https://dx.doi.org/10.1007/s10494-017-9866-2
Access Level:acceso abierto
Palabra clave:Wakes (Fluid dynamics)
LES
Vortex shedding
Wakes
Roughness
Dinàmica de fluids
Àrees temàtiques de la UPC::Enginyeria elèctrica
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spelling LES-based Study of the Roughness Effects on the Wake of a Circular Cylinder from Subcritical to Transcritical Reynolds NumbersRodriguez, IvetteLehmkuhl Barba, Oriol|||0000-0002-2670-1871Piomelli, UgoChiva, JorgeBorrell, RicardOliva, AssensiWakes (Fluid dynamics)LESVortex sheddingWakesRoughnessDinàmica de fluidsÀrees temàtiques de la UPC::Enginyeria elèctricaThis paper investigates the effects of surface roughness on the flow past a circular cylinder at subcritical to transcritical Reynolds numbers. Large eddy simulations of the flow for sand grain roughness of size k/D = 0.02 are performed (D is the cylinder diameter). Results show that surface roughness triggers the transition to turbulence in the boundary layer at all Reynolds numbers, thus leading to an early separation caused by the increased momentum deficit, especially at transcritical Reynolds numbers. Even at subcritical Reynolds numbers, boundary layer instabilities are triggered in the roughness sublayer and eventually lead to the transition to turbulence. The early separation at transcritical Reynolds numbers leads to a wake topology similar to that of the subcritical regime, resulting in an increased drag coefficient and lower Strouhal number. Turbulent statistics in the wake are also affected by roughness; the Reynolds stresses are larger due to the increased turbulent kinetic energy production in the boundary layer and separated shear layers close to the cylinder shoulders.We acknowledge “Red Española de Surpercomputación” (RES) for awarding us access to the MareNostrum III machine based in Barcelona, Spain (Ref. FI-2015-2-0026 and FI-2015-3-0011). We also acknowledge PRACE for awarding us access to Fermi and Marconi Supercomputers at Cineca, Italy (Ref. 2015133120). Oriol Lehmkuhl acknowledges a PDJ 2014 Grant by AGAUR (Generalitat de Catalunya). Ugo Piomelli acknowledges the support of the Natural Sciences and Engineering Research Council (NSERC) of Canada under the Discovery Grant Programme (Grant No. RGPIN-2016-04391). Ricard Borrell acknowledges a Juan de la Cierva postdoctoral grant (IJCI-2014-21034). Ivette Rodriguez, Oriol Lehmkuhl, Ricard Borrell and Assensi Oliva acknowledge Ministerio de Economía y Competitividad, Secretaría de Estado de Investigación, Desarrollo e Innovación, Spain (ref. ENE2014-60577-R).Peer ReviewedSpringer Verlag20172017-12-0120182018-03-07journal articlehttp://purl.org/coar/resource_type/c_6501AMhttp://purl.org/coar/version/c_ab4af688f83e57aainfo:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/114903https://dx.doi.org/10.1007/s10494-017-9866-2reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)InglésengMinisterio de Economía y Competitividad http://doi.org/10.13039/501100003329 IJCI-2014-21034 IJCI-2014-21034open accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/1149032026-05-27T15:37:01Z
dc.title.none.fl_str_mv LES-based Study of the Roughness Effects on the Wake of a Circular Cylinder from Subcritical to Transcritical Reynolds Numbers
title LES-based Study of the Roughness Effects on the Wake of a Circular Cylinder from Subcritical to Transcritical Reynolds Numbers
spellingShingle LES-based Study of the Roughness Effects on the Wake of a Circular Cylinder from Subcritical to Transcritical Reynolds Numbers
Rodriguez, Ivette
Wakes (Fluid dynamics)
LES
Vortex shedding
Wakes
Roughness
Dinàmica de fluids
Àrees temàtiques de la UPC::Enginyeria elèctrica
title_short LES-based Study of the Roughness Effects on the Wake of a Circular Cylinder from Subcritical to Transcritical Reynolds Numbers
title_full LES-based Study of the Roughness Effects on the Wake of a Circular Cylinder from Subcritical to Transcritical Reynolds Numbers
title_fullStr LES-based Study of the Roughness Effects on the Wake of a Circular Cylinder from Subcritical to Transcritical Reynolds Numbers
title_full_unstemmed LES-based Study of the Roughness Effects on the Wake of a Circular Cylinder from Subcritical to Transcritical Reynolds Numbers
title_sort LES-based Study of the Roughness Effects on the Wake of a Circular Cylinder from Subcritical to Transcritical Reynolds Numbers
dc.creator.none.fl_str_mv Rodriguez, Ivette
Lehmkuhl Barba, Oriol|||0000-0002-2670-1871
Piomelli, Ugo
Chiva, Jorge
Borrell, Ricard
Oliva, Assensi
author Rodriguez, Ivette
author_facet Rodriguez, Ivette
Lehmkuhl Barba, Oriol|||0000-0002-2670-1871
Piomelli, Ugo
Chiva, Jorge
Borrell, Ricard
Oliva, Assensi
author_role author
author2 Lehmkuhl Barba, Oriol|||0000-0002-2670-1871
Piomelli, Ugo
Chiva, Jorge
Borrell, Ricard
Oliva, Assensi
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Wakes (Fluid dynamics)
LES
Vortex shedding
Wakes
Roughness
Dinàmica de fluids
Àrees temàtiques de la UPC::Enginyeria elèctrica
topic Wakes (Fluid dynamics)
LES
Vortex shedding
Wakes
Roughness
Dinàmica de fluids
Àrees temàtiques de la UPC::Enginyeria elèctrica
description This paper investigates the effects of surface roughness on the flow past a circular cylinder at subcritical to transcritical Reynolds numbers. Large eddy simulations of the flow for sand grain roughness of size k/D = 0.02 are performed (D is the cylinder diameter). Results show that surface roughness triggers the transition to turbulence in the boundary layer at all Reynolds numbers, thus leading to an early separation caused by the increased momentum deficit, especially at transcritical Reynolds numbers. Even at subcritical Reynolds numbers, boundary layer instabilities are triggered in the roughness sublayer and eventually lead to the transition to turbulence. The early separation at transcritical Reynolds numbers leads to a wake topology similar to that of the subcritical regime, resulting in an increased drag coefficient and lower Strouhal number. Turbulent statistics in the wake are also affected by roughness; the Reynolds stresses are larger due to the increased turbulent kinetic energy production in the boundary layer and separated shear layers close to the cylinder shoulders.
publishDate 2017
dc.date.none.fl_str_mv 2017
2017-12-01
2018
2018-03-07
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/2117/114903
https://dx.doi.org/10.1007/s10494-017-9866-2
url https://hdl.handle.net/2117/114903
https://dx.doi.org/10.1007/s10494-017-9866-2
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.relation.none.fl_str_mv Ministerio de Economía y Competitividad http://doi.org/10.13039/501100003329 IJCI-2014-21034 IJCI-2014-21034
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
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
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Springer Verlag
publisher.none.fl_str_mv Springer Verlag
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
_version_ 1869419616843857920
score 15,300719

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