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
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/77795
Ver los metadatos del registro completo
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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) |
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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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13.070432 |