Porous media approach for RANS simulation of compound open-channel flows with submerged vegetated floodplains

Detalhes bibliográficos
Autor(a) principal: Brito, M.
Data de Publicação: 2016
Outros Autores: Fernandes, J. N., Leal, J. B.
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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spelling 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
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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
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dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
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