Porous media approach for RANS simulation of compound open-channel flows with submerged vegetated floodplains
Autor(a) principal: | |
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Data de Publicação: | 2016 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://dspace2.lnec.pt:8080/jspui/handle/123456789/1009453 http://repositorio.lnec.pt:8080/jspui/handle/123456789/1009453 |
Resumo: | The main goal of this study is the 3D numerical simulation of river flows with submerged vegetated floodplains. Since, vegetation layers are usually dense and present a large spatial heterogeneity they are here represented as a porous media. Standard semiempirical relations drawn for porous beds packed with non-spherical particles are used to estimate the porous media parameters based on the averaged geometry of the vegetation elements. Thus, eliminating the uncertainty arising from a bulk drag coefficient approach and allowing the use of a coarser mesh. The free flow is described by Reynolds-averaged Navier–Stokes (RANS) equations, whereas the porous media flow is described by the volumetric-average of RANS equations. The volume-of-fluid method and an anisotropic explicit algebraic Reynolds stress model are used for free-surface and turbulence closure, respectively. The simulation approach is validated against results by other authors featuring vegetated flows in horizontal and rectangular open-channel. The computed results show that the time-averaged streamwise velocity and Reynolds shear stress vertical profiles are properly simulated. The validated approach was applied to simulate compound openchannel flows with submerged vegetated floodplains and compared with data obtained in an experimental facility. The results show that the proposed porous media approach is adequate to simulate flows with submerged vegetation on the floodplains. |
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Porous media approach for RANS simulation of compound open-channel flows with submerged vegetated floodplainsCompound open-channelSubmerged vegetationPorous mediaEARSMMixing-layerThe main goal of this study is the 3D numerical simulation of river flows with submerged vegetated floodplains. Since, vegetation layers are usually dense and present a large spatial heterogeneity they are here represented as a porous media. Standard semiempirical relations drawn for porous beds packed with non-spherical particles are used to estimate the porous media parameters based on the averaged geometry of the vegetation elements. Thus, eliminating the uncertainty arising from a bulk drag coefficient approach and allowing the use of a coarser mesh. The free flow is described by Reynolds-averaged Navier–Stokes (RANS) equations, whereas the porous media flow is described by the volumetric-average of RANS equations. The volume-of-fluid method and an anisotropic explicit algebraic Reynolds stress model are used for free-surface and turbulence closure, respectively. The simulation approach is validated against results by other authors featuring vegetated flows in horizontal and rectangular open-channel. The computed results show that the time-averaged streamwise velocity and Reynolds shear stress vertical profiles are properly simulated. The validated approach was applied to simulate compound openchannel flows with submerged vegetated floodplains and compared with data obtained in an experimental facility. The results show that the proposed porous media approach is adequate to simulate flows with submerged vegetation on the floodplains.Springer2017-04-27T15:56:37Z2017-08-09T09:57:06Z2016-12-01T00:00:00Z2016-12info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://dspace2.lnec.pt:8080/jspui/handle/123456789/1009453http://repositorio.lnec.pt:8080/jspui/handle/123456789/1009453engBrito, M.Fernandes, J. N.Leal, J. B.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-01-13T03:07:09Zoai:localhost:123456789/1009453Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T01:40:15.822129Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Porous media approach for RANS simulation of compound open-channel flows with submerged vegetated floodplains |
title |
Porous media approach for RANS simulation of compound open-channel flows with submerged vegetated floodplains |
spellingShingle |
Porous media approach for RANS simulation of compound open-channel flows with submerged vegetated floodplains Brito, M. Compound open-channel Submerged vegetation Porous media EARSM Mixing-layer |
title_short |
Porous media approach for RANS simulation of compound open-channel flows with submerged vegetated floodplains |
title_full |
Porous media approach for RANS simulation of compound open-channel flows with submerged vegetated floodplains |
title_fullStr |
Porous media approach for RANS simulation of compound open-channel flows with submerged vegetated floodplains |
title_full_unstemmed |
Porous media approach for RANS simulation of compound open-channel flows with submerged vegetated floodplains |
title_sort |
Porous media approach for RANS simulation of compound open-channel flows with submerged vegetated floodplains |
author |
Brito, M. |
author_facet |
Brito, M. Fernandes, J. N. Leal, J. B. |
author_role |
author |
author2 |
Fernandes, J. N. Leal, J. B. |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Brito, M. Fernandes, J. N. Leal, J. B. |
dc.subject.por.fl_str_mv |
Compound open-channel Submerged vegetation Porous media EARSM Mixing-layer |
topic |
Compound open-channel Submerged vegetation Porous media EARSM Mixing-layer |
description |
The main goal of this study is the 3D numerical simulation of river flows with submerged vegetated floodplains. Since, vegetation layers are usually dense and present a large spatial heterogeneity they are here represented as a porous media. Standard semiempirical relations drawn for porous beds packed with non-spherical particles are used to estimate the porous media parameters based on the averaged geometry of the vegetation elements. Thus, eliminating the uncertainty arising from a bulk drag coefficient approach and allowing the use of a coarser mesh. The free flow is described by Reynolds-averaged Navier–Stokes (RANS) equations, whereas the porous media flow is described by the volumetric-average of RANS equations. The volume-of-fluid method and an anisotropic explicit algebraic Reynolds stress model are used for free-surface and turbulence closure, respectively. The simulation approach is validated against results by other authors featuring vegetated flows in horizontal and rectangular open-channel. The computed results show that the time-averaged streamwise velocity and Reynolds shear stress vertical profiles are properly simulated. The validated approach was applied to simulate compound openchannel flows with submerged vegetated floodplains and compared with data obtained in an experimental facility. The results show that the proposed porous media approach is adequate to simulate flows with submerged vegetation on the floodplains. |
publishDate |
2016 |
dc.date.none.fl_str_mv |
2016-12-01T00:00:00Z 2016-12 2017-04-27T15:56:37Z 2017-08-09T09:57:06Z |
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 |
http://dspace2.lnec.pt:8080/jspui/handle/123456789/1009453 http://repositorio.lnec.pt:8080/jspui/handle/123456789/1009453 |
url |
http://dspace2.lnec.pt:8080/jspui/handle/123456789/1009453 http://repositorio.lnec.pt:8080/jspui/handle/123456789/1009453 |
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.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Springer |
publisher.none.fl_str_mv |
Springer |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
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1799136891831844864 |