Note on a Parametric Relation for Separating Flow over a Rough Hill

Detalhes bibliográficos
Autor(a) principal: Loureiro, Juliana Braga Rodrigues
Data de Publicação: 2009
Outros Autores: Freire, Atila Pantaleão Silva
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFRJ
Texto Completo: http://hdl.handle.net/11422/8783
Resumo: A parametrization method used to account for the effects of flow separation and wall roughness on the lower boundary condition for turbulent boundary layers is investigated against direct numerical simulation and laser Doppler anemometry data. The numerical simulation represents flow over a smooth, flat surface with a prescribed external adverse pressure gradient. The water-channel experiments cover flow over smooth and rough hills for two specified Reynolds numbers. Global optimization algorithms based on four different direct search methods are used to assess the parametrization function, C, in terms of local mean velocity profiles and the parametrization parameters u * (friction velocity), ∂ x p (local pressure gradient), z 0 (effective roughness) and d (zero-plane displacement). The study investigates regions of attached and reversed flows, and forty-two velocity profiles are compared with the proposed expression for the function C, including two profiles that satisfy the solution of Stratford.
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spelling Note on a Parametric Relation for Separating Flow over a Rough HillHill flowLower boundary conditionRoughnessSeparationCNPQ::CIENCIAS EXATAS E DA TERRA::FISICA::AREAS CLASSICAS DE FENOMENOLOGIA E SUAS APLICACOES::DINAMICA DOS FLUIDOSA parametrization method used to account for the effects of flow separation and wall roughness on the lower boundary condition for turbulent boundary layers is investigated against direct numerical simulation and laser Doppler anemometry data. The numerical simulation represents flow over a smooth, flat surface with a prescribed external adverse pressure gradient. The water-channel experiments cover flow over smooth and rough hills for two specified Reynolds numbers. Global optimization algorithms based on four different direct search methods are used to assess the parametrization function, C, in terms of local mean velocity profiles and the parametrization parameters u * (friction velocity), ∂ x p (local pressure gradient), z 0 (effective roughness) and d (zero-plane displacement). The study investigates regions of attached and reversed flows, and forty-two velocity profiles are compared with the proposed expression for the function C, including two profiles that satisfy the solution of Stratford.Indisponível.SpringerBrasilNúcleo Interdisciplinar de Dinâmica dos Fluidos2019-07-12T16:59:10Z2023-12-21T03:06:13Z2009-02-09info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article1573-1472http://hdl.handle.net/11422/878310.1007/s10546-009-9362-xengBoundary-Layer MeteorologyLoureiro, Juliana Braga RodriguesFreire, Atila Pantaleão Silvainfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRJinstname:Universidade Federal do Rio de Janeiro (UFRJ)instacron:UFRJ2023-12-21T03:06:13Zoai:pantheon.ufrj.br:11422/8783Repositório InstitucionalPUBhttp://www.pantheon.ufrj.br/oai/requestpantheon@sibi.ufrj.bropendoar:2023-12-21T03:06:13Repositório Institucional da UFRJ - Universidade Federal do Rio de Janeiro (UFRJ)false
dc.title.none.fl_str_mv Note on a Parametric Relation for Separating Flow over a Rough Hill
title Note on a Parametric Relation for Separating Flow over a Rough Hill
spellingShingle Note on a Parametric Relation for Separating Flow over a Rough Hill
Loureiro, Juliana Braga Rodrigues
Hill flow
Lower boundary condition
Roughness
Separation
CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA::AREAS CLASSICAS DE FENOMENOLOGIA E SUAS APLICACOES::DINAMICA DOS FLUIDOS
title_short Note on a Parametric Relation for Separating Flow over a Rough Hill
title_full Note on a Parametric Relation for Separating Flow over a Rough Hill
title_fullStr Note on a Parametric Relation for Separating Flow over a Rough Hill
title_full_unstemmed Note on a Parametric Relation for Separating Flow over a Rough Hill
title_sort Note on a Parametric Relation for Separating Flow over a Rough Hill
author Loureiro, Juliana Braga Rodrigues
author_facet Loureiro, Juliana Braga Rodrigues
Freire, Atila Pantaleão Silva
author_role author
author2 Freire, Atila Pantaleão Silva
author2_role author
dc.contributor.author.fl_str_mv Loureiro, Juliana Braga Rodrigues
Freire, Atila Pantaleão Silva
dc.subject.por.fl_str_mv Hill flow
Lower boundary condition
Roughness
Separation
CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA::AREAS CLASSICAS DE FENOMENOLOGIA E SUAS APLICACOES::DINAMICA DOS FLUIDOS
topic Hill flow
Lower boundary condition
Roughness
Separation
CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA::AREAS CLASSICAS DE FENOMENOLOGIA E SUAS APLICACOES::DINAMICA DOS FLUIDOS
description A parametrization method used to account for the effects of flow separation and wall roughness on the lower boundary condition for turbulent boundary layers is investigated against direct numerical simulation and laser Doppler anemometry data. The numerical simulation represents flow over a smooth, flat surface with a prescribed external adverse pressure gradient. The water-channel experiments cover flow over smooth and rough hills for two specified Reynolds numbers. Global optimization algorithms based on four different direct search methods are used to assess the parametrization function, C, in terms of local mean velocity profiles and the parametrization parameters u * (friction velocity), ∂ x p (local pressure gradient), z 0 (effective roughness) and d (zero-plane displacement). The study investigates regions of attached and reversed flows, and forty-two velocity profiles are compared with the proposed expression for the function C, including two profiles that satisfy the solution of Stratford.
publishDate 2009
dc.date.none.fl_str_mv 2009-02-09
2019-07-12T16:59:10Z
2023-12-21T03:06:13Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv 1573-1472
http://hdl.handle.net/11422/8783
10.1007/s10546-009-9362-x
identifier_str_mv 1573-1472
10.1007/s10546-009-9362-x
url http://hdl.handle.net/11422/8783
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Boundary-Layer Meteorology
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Springer
Brasil
Núcleo Interdisciplinar de Dinâmica dos Fluidos
publisher.none.fl_str_mv Springer
Brasil
Núcleo Interdisciplinar de Dinâmica dos Fluidos
dc.source.none.fl_str_mv reponame:Repositório Institucional da UFRJ
instname:Universidade Federal do Rio de Janeiro (UFRJ)
instacron:UFRJ
instname_str Universidade Federal do Rio de Janeiro (UFRJ)
instacron_str UFRJ
institution UFRJ
reponame_str Repositório Institucional da UFRJ
collection Repositório Institucional da UFRJ
repository.name.fl_str_mv Repositório Institucional da UFRJ - Universidade Federal do Rio de Janeiro (UFRJ)
repository.mail.fl_str_mv pantheon@sibi.ufrj.br
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