Simulations of turbulent channels with prescribed velocity profiles

Autores
Türke, Florian Alexander; Jiménez, Javier
Año de publicación
2013
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Direct numerical simulations of turbulent channels with artificially prescribed velocity profiles are discussed, using both natural and purposely incorrect profiles. It is found that turbulence develops correctly when natural profiles are prescribed, but that even slightly incorrect ones modify the Reynolds stresses substantially. That is used to study the dynamics of the energy-containing velocity fluctuations. The stronger (weaker) structures generated by locally stronger (weaker) mean shears have essentially correct isotropy coefficients but they are out of energy equilibrium, with the energy imbalance compensated by turbulent diffusion. The velocity scale in smooth profiles changes with the distance to the wall, and is best described by a friction velocity derived from the local total tangential stress. The behaviour across sharper shear jumps is more consistent with non-equilibrium eddies that relax over wall-normal distances of the order of the distance to the wall, suggesting that the energy equilibrium in the logarithmic layer is not local to a given height, but applies to extended layers homogenized by wall-normal fluxes. Examples of that non-local character are the large-scale inactive fluctuations near the wall, whose velocities do not scale with the local shear stress, but with that of their active 'cores' farther away from the wall. © Cambridge University Press 2013.
Fil: Türke, Florian Alexander. Consejo Nacional de Investigaciones Científicas y Técnicas. Universidad de Buenos Aires; Argentina. Technishe Universitat Berlin; Alemania. Universidad Politécnica de Madrid; España
Fil: Jiménez, Javier. Universidad Politécnica de Madrid; España. Stanford University; Estados Unidos
Materia
Turbulent Boundary Layers
Turbulent Flows
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/77795

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spelling Simulations of turbulent channels with prescribed velocity profilesTürke, Florian AlexanderJiménez, JavierTurbulent Boundary LayersTurbulent Flowshttps://purl.org/becyt/ford/2.3https://purl.org/becyt/ford/2Direct numerical simulations of turbulent channels with artificially prescribed velocity profiles are discussed, using both natural and purposely incorrect profiles. It is found that turbulence develops correctly when natural profiles are prescribed, but that even slightly incorrect ones modify the Reynolds stresses substantially. That is used to study the dynamics of the energy-containing velocity fluctuations. The stronger (weaker) structures generated by locally stronger (weaker) mean shears have essentially correct isotropy coefficients but they are out of energy equilibrium, with the energy imbalance compensated by turbulent diffusion. The velocity scale in smooth profiles changes with the distance to the wall, and is best described by a friction velocity derived from the local total tangential stress. The behaviour across sharper shear jumps is more consistent with non-equilibrium eddies that relax over wall-normal distances of the order of the distance to the wall, suggesting that the energy equilibrium in the logarithmic layer is not local to a given height, but applies to extended layers homogenized by wall-normal fluxes. Examples of that non-local character are the large-scale inactive fluctuations near the wall, whose velocities do not scale with the local shear stress, but with that of their active 'cores' farther away from the wall. © Cambridge University Press 2013.Fil: Türke, Florian Alexander. Consejo Nacional de Investigaciones Científicas y Técnicas. Universidad de Buenos Aires; Argentina. Technishe Universitat Berlin; Alemania. Universidad Politécnica de Madrid; EspañaFil: Jiménez, Javier. Universidad Politécnica de Madrid; España. Stanford University; Estados UnidosCambridge University Press2013-05info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/77795Türke, Florian Alexander; Jiménez, Javier; Simulations of turbulent channels with prescribed velocity profiles; Cambridge University Press; Journal of Fluid Mechanics; 723; 5-2013; 587-6030022-1120CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.cambridge.org/core/journals/journal-of-fluid-mechanics/article/simulations-of-turbulent-channels-with-prescribed-velocity-profiles/7F922989F278F85452EB384D95812B6Finfo:eu-repo/semantics/altIdentifier/doi/10.1017/jfm.2013.143info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:38:36Zoai:ri.conicet.gov.ar:11336/77795instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 09:38:37.274CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Simulations of turbulent channels with prescribed velocity profiles
title Simulations of turbulent channels with prescribed velocity profiles
spellingShingle Simulations of turbulent channels with prescribed velocity profiles
Türke, Florian Alexander
Turbulent Boundary Layers
Turbulent Flows
title_short Simulations of turbulent channels with prescribed velocity profiles
title_full Simulations of turbulent channels with prescribed velocity profiles
title_fullStr Simulations of turbulent channels with prescribed velocity profiles
title_full_unstemmed Simulations of turbulent channels with prescribed velocity profiles
title_sort Simulations of turbulent channels with prescribed velocity profiles
dc.creator.none.fl_str_mv Türke, Florian Alexander
Jiménez, Javier
author Türke, Florian Alexander
author_facet Türke, Florian Alexander
Jiménez, Javier
author_role author
author2 Jiménez, Javier
author2_role author
dc.subject.none.fl_str_mv Turbulent Boundary Layers
Turbulent Flows
topic Turbulent Boundary Layers
Turbulent Flows
purl_subject.fl_str_mv https://purl.org/becyt/ford/2.3
https://purl.org/becyt/ford/2
dc.description.none.fl_txt_mv Direct numerical simulations of turbulent channels with artificially prescribed velocity profiles are discussed, using both natural and purposely incorrect profiles. It is found that turbulence develops correctly when natural profiles are prescribed, but that even slightly incorrect ones modify the Reynolds stresses substantially. That is used to study the dynamics of the energy-containing velocity fluctuations. The stronger (weaker) structures generated by locally stronger (weaker) mean shears have essentially correct isotropy coefficients but they are out of energy equilibrium, with the energy imbalance compensated by turbulent diffusion. The velocity scale in smooth profiles changes with the distance to the wall, and is best described by a friction velocity derived from the local total tangential stress. The behaviour across sharper shear jumps is more consistent with non-equilibrium eddies that relax over wall-normal distances of the order of the distance to the wall, suggesting that the energy equilibrium in the logarithmic layer is not local to a given height, but applies to extended layers homogenized by wall-normal fluxes. Examples of that non-local character are the large-scale inactive fluctuations near the wall, whose velocities do not scale with the local shear stress, but with that of their active 'cores' farther away from the wall. © Cambridge University Press 2013.
Fil: Türke, Florian Alexander. Consejo Nacional de Investigaciones Científicas y Técnicas. Universidad de Buenos Aires; Argentina. Technishe Universitat Berlin; Alemania. Universidad Politécnica de Madrid; España
Fil: Jiménez, Javier. Universidad Politécnica de Madrid; España. Stanford University; Estados Unidos
description Direct numerical simulations of turbulent channels with artificially prescribed velocity profiles are discussed, using both natural and purposely incorrect profiles. It is found that turbulence develops correctly when natural profiles are prescribed, but that even slightly incorrect ones modify the Reynolds stresses substantially. That is used to study the dynamics of the energy-containing velocity fluctuations. The stronger (weaker) structures generated by locally stronger (weaker) mean shears have essentially correct isotropy coefficients but they are out of energy equilibrium, with the energy imbalance compensated by turbulent diffusion. The velocity scale in smooth profiles changes with the distance to the wall, and is best described by a friction velocity derived from the local total tangential stress. The behaviour across sharper shear jumps is more consistent with non-equilibrium eddies that relax over wall-normal distances of the order of the distance to the wall, suggesting that the energy equilibrium in the logarithmic layer is not local to a given height, but applies to extended layers homogenized by wall-normal fluxes. Examples of that non-local character are the large-scale inactive fluctuations near the wall, whose velocities do not scale with the local shear stress, but with that of their active 'cores' farther away from the wall. © Cambridge University Press 2013.
publishDate 2013
dc.date.none.fl_str_mv 2013-05
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/77795
Türke, Florian Alexander; Jiménez, Javier; Simulations of turbulent channels with prescribed velocity profiles; Cambridge University Press; Journal of Fluid Mechanics; 723; 5-2013; 587-603
0022-1120
CONICET Digital
CONICET
url http://hdl.handle.net/11336/77795
identifier_str_mv Türke, Florian Alexander; Jiménez, Javier; Simulations of turbulent channels with prescribed velocity profiles; Cambridge University Press; Journal of Fluid Mechanics; 723; 5-2013; 587-603
0022-1120
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://www.cambridge.org/core/journals/journal-of-fluid-mechanics/article/simulations-of-turbulent-channels-with-prescribed-velocity-profiles/7F922989F278F85452EB384D95812B6F
info:eu-repo/semantics/altIdentifier/doi/10.1017/jfm.2013.143
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Cambridge University Press
publisher.none.fl_str_mv Cambridge University Press
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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