Similarity laws for transpired turbulent flows subjected to pressure gradients, separation and wall heat transfer

Detalhes bibliográficos
Autor(a) principal: Guimaraes, Mateus Carvalho
Data de Publicação: 2018
Tipo de documento: Dissertação
Idioma: eng
Título da fonte: Repositório Institucional da UFRJ
Texto Completo: http://hdl.handle.net/11422/12151
Resumo: New scaling laws for transpired turbulent flows with non-zero pressure gradients and wall heat transfer are derived. The new wall laws are the first presented in literature that consider flow transpiration and separation. It emerges from the proposed scaling that mean velocity and temperature profiles are self-similar with respect to the transpiration rate in the whole near wall region of the flow. The domains of validity of the wall laws are extended, to include the outer region of the boundary layer, using the intermittent character of the flow in that region. It is found that the intermittency factor used in the model is a universal function of the wall normal direction scaled by the boundary layer thickness. The new theory is compared to over 200 experimental and DNS mean velocity and temperature profiles from several turbulence databases and with other turbulence models as well showing that, for most of the profiles analyzed, the new formulation gives a better fit to the data.
id UFRJ_2babf37791f0f01886c95aa1acb77ab1
oai_identifier_str oai:pantheon.ufrj.br:11422/12151
network_acronym_str UFRJ
network_name_str Repositório Institucional da UFRJ
repository_id_str
spelling Similarity laws for transpired turbulent flows subjected to pressure gradients, separation and wall heat transferTurbulênciaSeparação de fluxoCNPQ::ENGENHARIAS::ENGENHARIA MECANICANew scaling laws for transpired turbulent flows with non-zero pressure gradients and wall heat transfer are derived. The new wall laws are the first presented in literature that consider flow transpiration and separation. It emerges from the proposed scaling that mean velocity and temperature profiles are self-similar with respect to the transpiration rate in the whole near wall region of the flow. The domains of validity of the wall laws are extended, to include the outer region of the boundary layer, using the intermittent character of the flow in that region. It is found that the intermittency factor used in the model is a universal function of the wall normal direction scaled by the boundary layer thickness. The new theory is compared to over 200 experimental and DNS mean velocity and temperature profiles from several turbulence databases and with other turbulence models as well showing that, for most of the profiles analyzed, the new formulation gives a better fit to the data.Novas leis de escala para escoamentos turbulentos transpirados com gradientes de pressão não nulos e transferência de calor na parede são propostas. A nova lei de parede é a primeira na literatura a considerar os efeitos combinados da transpiração e gradiente de pressão, incluindo o fenômeno da separação do escoamento. A questão da similaridade dos perfis de velocidade e temperatura média na região próxima a parede é estudada e encontra-se que perfis provenientes de escoamentos com diferentes taxas de transpiração são similares quando escalados por novas expressões para a velocidade e temperatura características do escoamento, respectivamente, deduzidas neste trabalho a partir de uma análise de ordens de grandeza da equação aproximada do movimento. O domínio de validade das leis de parede é estendido, para incluir a região externa da camada limite, utilizando o caráter intermitente do escoamento nesta região. A nova formulação é comparada com mais de 200 perfis de velocidade e temperatura média provenientes de diversas bases de dados de escoamentos turbulentos e também com diferentes modelos de turbulência disponíveis na literatura mostrando que, para a maioria dos perfis analisados, a teoria proposta se ajusta melhor aos dados.Universidade Federal do Rio de JaneiroBrasilInstituto Alberto Luiz Coimbra de Pós-Graduação e Pesquisa de EngenhariaPrograma de Pós-Graduação em Engenharia MecânicaUFRJCruz, Daniel Onofre Almeidahttp://lattes.cnpq.br/0536286226914691http://lattes.cnpq.br/9950209911306969Freire, Atila Pantaleão SilvaRamos, Fabio Antonio TavaresMoriconi, Luca Roberto AugustoGuimaraes, Mateus Carvalho2020-05-07T12:04:12Z2023-12-21T03:00:48Z2018-02info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesishttp://hdl.handle.net/11422/12151enginfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRJinstname:Universidade Federal do Rio de Janeiro (UFRJ)instacron:UFRJ2023-12-21T03:00:48Zoai:pantheon.ufrj.br:11422/12151Repositório InstitucionalPUBhttp://www.pantheon.ufrj.br/oai/requestpantheon@sibi.ufrj.bropendoar:2023-12-21T03:00:48Repositório Institucional da UFRJ - Universidade Federal do Rio de Janeiro (UFRJ)false
dc.title.none.fl_str_mv Similarity laws for transpired turbulent flows subjected to pressure gradients, separation and wall heat transfer
title Similarity laws for transpired turbulent flows subjected to pressure gradients, separation and wall heat transfer
spellingShingle Similarity laws for transpired turbulent flows subjected to pressure gradients, separation and wall heat transfer
Guimaraes, Mateus Carvalho
Turbulência
Separação de fluxo
CNPQ::ENGENHARIAS::ENGENHARIA MECANICA
title_short Similarity laws for transpired turbulent flows subjected to pressure gradients, separation and wall heat transfer
title_full Similarity laws for transpired turbulent flows subjected to pressure gradients, separation and wall heat transfer
title_fullStr Similarity laws for transpired turbulent flows subjected to pressure gradients, separation and wall heat transfer
title_full_unstemmed Similarity laws for transpired turbulent flows subjected to pressure gradients, separation and wall heat transfer
title_sort Similarity laws for transpired turbulent flows subjected to pressure gradients, separation and wall heat transfer
author Guimaraes, Mateus Carvalho
author_facet Guimaraes, Mateus Carvalho
author_role author
dc.contributor.none.fl_str_mv Cruz, Daniel Onofre Almeida
http://lattes.cnpq.br/0536286226914691
http://lattes.cnpq.br/9950209911306969
Freire, Atila Pantaleão Silva
Ramos, Fabio Antonio Tavares
Moriconi, Luca Roberto Augusto
dc.contributor.author.fl_str_mv Guimaraes, Mateus Carvalho
dc.subject.por.fl_str_mv Turbulência
Separação de fluxo
CNPQ::ENGENHARIAS::ENGENHARIA MECANICA
topic Turbulência
Separação de fluxo
CNPQ::ENGENHARIAS::ENGENHARIA MECANICA
description New scaling laws for transpired turbulent flows with non-zero pressure gradients and wall heat transfer are derived. The new wall laws are the first presented in literature that consider flow transpiration and separation. It emerges from the proposed scaling that mean velocity and temperature profiles are self-similar with respect to the transpiration rate in the whole near wall region of the flow. The domains of validity of the wall laws are extended, to include the outer region of the boundary layer, using the intermittent character of the flow in that region. It is found that the intermittency factor used in the model is a universal function of the wall normal direction scaled by the boundary layer thickness. The new theory is compared to over 200 experimental and DNS mean velocity and temperature profiles from several turbulence databases and with other turbulence models as well showing that, for most of the profiles analyzed, the new formulation gives a better fit to the data.
publishDate 2018
dc.date.none.fl_str_mv 2018-02
2020-05-07T12:04:12Z
2023-12-21T03:00:48Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/11422/12151
url http://hdl.handle.net/11422/12151
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Universidade Federal do Rio de Janeiro
Brasil
Instituto Alberto Luiz Coimbra de Pós-Graduação e Pesquisa de Engenharia
Programa de Pós-Graduação em Engenharia Mecânica
UFRJ
publisher.none.fl_str_mv Universidade Federal do Rio de Janeiro
Brasil
Instituto Alberto Luiz Coimbra de Pós-Graduação e Pesquisa de Engenharia
Programa de Pós-Graduação em Engenharia Mecânica
UFRJ
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
_version_ 1815456006792019968

Registros relacionados