Effective diffusivity of passive scalars in rotating turbulence

Autores
Rodriguez Imazio, Paola Carolina; Mininni, Pablo Daniel
Año de publicación
2013
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We use direct numerical simulations to compute turbulent transport coefficients for passive scalars in turbulent rotating flows. Effective diffusion coefficients in the directions parallel and perpendicular to the rotation axis are obtained by studying the diffusion of an imposed initial profile for the passive scalar, and calculated by measuring the scalar average concentration and average spatial flux as a function of time. The Rossby and Schmidt numbers are varied to quantify their effect on the effective diffusion. It is found that rotation reduces scalar diffusivity in the perpendicular direction. The perpendicular diffusion can be estimated from mixing length arguments using the characteristic velocities and lengths perpendicular to the rotation axis. Deviations are observed for small Schmidt numbers, for which turbulent transport decreases and molecular diffusion becomes more significant.
Fil: Rodriguez Imazio, Paola Carolina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Física de Buenos Aires; Argentina; National Center for Atmospheric Research; Estados Unidos de América;
Fil: Mininni, Pablo Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Física de Buenos Aires; Argentina; National Center for Atmospheric Research; Estados Unidos de América;
Materia
ROTATING FLOWS
SWIRLING FLOWS
PASSIVE SCALAR
TURBULENT DIFFUSION
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:11336/652
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/652
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Effective diffusivity of passive scalars in rotating turbulenceRodriguez Imazio, Paola CarolinaMininni, Pablo DanielROTATING FLOWSSWIRLING FLOWSPASSIVE SCALARTURBULENT DIFFUSIONhttps://purl.org/becyt/ford/1https://purl.org/becyt/ford/1.3We use direct numerical simulations to compute turbulent transport coefficients for passive scalars in turbulent rotating flows. Effective diffusion coefficients in the directions parallel and perpendicular to the rotation axis are obtained by studying the diffusion of an imposed initial profile for the passive scalar, and calculated by measuring the scalar average concentration and average spatial flux as a function of time. The Rossby and Schmidt numbers are varied to quantify their effect on the effective diffusion. It is found that rotation reduces scalar diffusivity in the perpendicular direction. The perpendicular diffusion can be estimated from mixing length arguments using the characteristic velocities and lengths perpendicular to the rotation axis. Deviations are observed for small Schmidt numbers, for which turbulent transport decreases and molecular diffusion becomes more significant.Fil: Rodriguez Imazio, Paola Carolina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Física de Buenos Aires; Argentina; National Center for Atmospheric Research; Estados Unidos de América;Fil: Mininni, Pablo Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Física de Buenos Aires; Argentina; National Center for Atmospheric Research; Estados Unidos de América;Amer Physical Soc2013-02-25info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/652Rodriguez Imazio, Paola Carolina; Mininni, Pablo Daniel; Effective diffusivity of passive scalars in rotating turbulence; Amer Physical Soc; Physical Review E; 87; 2; 25-2-2013; 023018(9);1539-3755enginfo:eu-repo/semantics/altIdentifier/doi/10.1103/PhysRevE.87.023018info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-15T15:20:14Zoai:ri.conicet.gov.ar:11336/652instacron: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:34982025-10-15 15:20:14.348CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Effective diffusivity of passive scalars in rotating turbulence
title Effective diffusivity of passive scalars in rotating turbulence
spellingShingle Effective diffusivity of passive scalars in rotating turbulence
Rodriguez Imazio, Paola Carolina
ROTATING FLOWS
SWIRLING FLOWS
PASSIVE SCALAR
TURBULENT DIFFUSION
title_short Effective diffusivity of passive scalars in rotating turbulence
title_full Effective diffusivity of passive scalars in rotating turbulence
title_fullStr Effective diffusivity of passive scalars in rotating turbulence
title_full_unstemmed Effective diffusivity of passive scalars in rotating turbulence
title_sort Effective diffusivity of passive scalars in rotating turbulence
dc.creator.none.fl_str_mv Rodriguez Imazio, Paola Carolina
Mininni, Pablo Daniel
author Rodriguez Imazio, Paola Carolina
author_facet Rodriguez Imazio, Paola Carolina
Mininni, Pablo Daniel
author_role author
author2 Mininni, Pablo Daniel
author2_role author
dc.subject.none.fl_str_mv ROTATING FLOWS
SWIRLING FLOWS
PASSIVE SCALAR
TURBULENT DIFFUSION
topic ROTATING FLOWS
SWIRLING FLOWS
PASSIVE SCALAR
TURBULENT DIFFUSION
purl_subject.fl_str_mv https://purl.org/becyt/ford/1
https://purl.org/becyt/ford/1.3
dc.description.none.fl_txt_mv We use direct numerical simulations to compute turbulent transport coefficients for passive scalars in turbulent rotating flows. Effective diffusion coefficients in the directions parallel and perpendicular to the rotation axis are obtained by studying the diffusion of an imposed initial profile for the passive scalar, and calculated by measuring the scalar average concentration and average spatial flux as a function of time. The Rossby and Schmidt numbers are varied to quantify their effect on the effective diffusion. It is found that rotation reduces scalar diffusivity in the perpendicular direction. The perpendicular diffusion can be estimated from mixing length arguments using the characteristic velocities and lengths perpendicular to the rotation axis. Deviations are observed for small Schmidt numbers, for which turbulent transport decreases and molecular diffusion becomes more significant.
Fil: Rodriguez Imazio, Paola Carolina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Física de Buenos Aires; Argentina; National Center for Atmospheric Research; Estados Unidos de América;
Fil: Mininni, Pablo Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Física de Buenos Aires; Argentina; National Center for Atmospheric Research; Estados Unidos de América;
description We use direct numerical simulations to compute turbulent transport coefficients for passive scalars in turbulent rotating flows. Effective diffusion coefficients in the directions parallel and perpendicular to the rotation axis are obtained by studying the diffusion of an imposed initial profile for the passive scalar, and calculated by measuring the scalar average concentration and average spatial flux as a function of time. The Rossby and Schmidt numbers are varied to quantify their effect on the effective diffusion. It is found that rotation reduces scalar diffusivity in the perpendicular direction. The perpendicular diffusion can be estimated from mixing length arguments using the characteristic velocities and lengths perpendicular to the rotation axis. Deviations are observed for small Schmidt numbers, for which turbulent transport decreases and molecular diffusion becomes more significant.
publishDate 2013
dc.date.none.fl_str_mv 2013-02-25
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/11336/652
Rodriguez Imazio, Paola Carolina; Mininni, Pablo Daniel; Effective diffusivity of passive scalars in rotating turbulence; Amer Physical Soc; Physical Review E; 87; 2; 25-2-2013; 023018(9);
1539-3755
url http://hdl.handle.net/11336/652
identifier_str_mv Rodriguez Imazio, Paola Carolina; Mininni, Pablo Daniel; Effective diffusivity of passive scalars in rotating turbulence; Amer Physical Soc; Physical Review E; 87; 2; 25-2-2013; 023018(9);
1539-3755
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1103/PhysRevE.87.023018
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 Amer Physical Soc
publisher.none.fl_str_mv Amer Physical Soc
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
_version_ 1846083350751608832
score 13.22299

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