Combination of experimental and numerical approaches to determine the main characteristics of skimming flow in stepped spillways
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | RBRH (Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2318-03312020000100203 |
Resumo: | ABSTRACT The traditional approach for the hydrodynamic characterization of the flow down stepped spillways is through physical modeling, which is susceptible to scale effects and has limitations related to experimental apparatus, laboratory space and the spatial discretization of data collection. Computational fluid dynamics (CFD) is an important tool for hydrodynamic analysis because, if used properly, it presents great potential for application in hydraulics. In this work, CFD was used to model the skimming flow down a stepped spillway to investigate the effects of possible pressure measurement errors due to uncertainties in the position of the sensors within the steps. The numerical model was validated through literature velocity profiles and pressure experimental data. The results showed that the best values of water fraction (α) to define free surface are α = 0.30 in the nonaerated region and α = 0.10 in the aerated region. Statistical parameters were calculated using experimental data to estimate extreme pressures. These parameters and the simulation results were used to determine that the extreme maximum and minimum pressures occur, respectively, in the region of 0.81 < x/l < 0.98, in the horizontal faces, and in the region of 0.93 < y/h < 0.98, in the vertical faces. |
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Combination of experimental and numerical approaches to determine the main characteristics of skimming flow in stepped spillwaysStepped spillwaysCFDFree surfaceTurbulencePressureABSTRACT The traditional approach for the hydrodynamic characterization of the flow down stepped spillways is through physical modeling, which is susceptible to scale effects and has limitations related to experimental apparatus, laboratory space and the spatial discretization of data collection. Computational fluid dynamics (CFD) is an important tool for hydrodynamic analysis because, if used properly, it presents great potential for application in hydraulics. In this work, CFD was used to model the skimming flow down a stepped spillway to investigate the effects of possible pressure measurement errors due to uncertainties in the position of the sensors within the steps. The numerical model was validated through literature velocity profiles and pressure experimental data. The results showed that the best values of water fraction (α) to define free surface are α = 0.30 in the nonaerated region and α = 0.10 in the aerated region. Statistical parameters were calculated using experimental data to estimate extreme pressures. These parameters and the simulation results were used to determine that the extreme maximum and minimum pressures occur, respectively, in the region of 0.81 < x/l < 0.98, in the horizontal faces, and in the region of 0.93 < y/h < 0.98, in the vertical faces.Associação Brasileira de Recursos Hídricos2020-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S2318-03312020000100203RBRH v.25 2020reponame:RBRH (Online)instname:Associação Brasileira de Recursos Hídricos (ABRH)instacron:ABRH10.1590/2318-0331.252020190070info:eu-repo/semantics/openAccessTassinari,Lucas Camargo da SilvaSanagiotto,Daniela GuzzonMarques,Marcelo GiulianLauffer,Luísa LüdtkeTrierweiler Neto,Edgar Fernandoeng2020-01-27T00:00:00Zoai:scielo:S2318-03312020000100203Revistahttps://www.scielo.br/j/rbrh/https://old.scielo.br/oai/scielo-oai.php||rbrh@abrh.org.br2318-03311414-381Xopendoar:2020-01-27T00:00RBRH (Online) - Associação Brasileira de Recursos Hídricos (ABRH)false |
dc.title.none.fl_str_mv |
Combination of experimental and numerical approaches to determine the main characteristics of skimming flow in stepped spillways |
title |
Combination of experimental and numerical approaches to determine the main characteristics of skimming flow in stepped spillways |
spellingShingle |
Combination of experimental and numerical approaches to determine the main characteristics of skimming flow in stepped spillways Tassinari,Lucas Camargo da Silva Stepped spillways CFD Free surface Turbulence Pressure |
title_short |
Combination of experimental and numerical approaches to determine the main characteristics of skimming flow in stepped spillways |
title_full |
Combination of experimental and numerical approaches to determine the main characteristics of skimming flow in stepped spillways |
title_fullStr |
Combination of experimental and numerical approaches to determine the main characteristics of skimming flow in stepped spillways |
title_full_unstemmed |
Combination of experimental and numerical approaches to determine the main characteristics of skimming flow in stepped spillways |
title_sort |
Combination of experimental and numerical approaches to determine the main characteristics of skimming flow in stepped spillways |
author |
Tassinari,Lucas Camargo da Silva |
author_facet |
Tassinari,Lucas Camargo da Silva Sanagiotto,Daniela Guzzon Marques,Marcelo Giulian Lauffer,Luísa Lüdtke Trierweiler Neto,Edgar Fernando |
author_role |
author |
author2 |
Sanagiotto,Daniela Guzzon Marques,Marcelo Giulian Lauffer,Luísa Lüdtke Trierweiler Neto,Edgar Fernando |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Tassinari,Lucas Camargo da Silva Sanagiotto,Daniela Guzzon Marques,Marcelo Giulian Lauffer,Luísa Lüdtke Trierweiler Neto,Edgar Fernando |
dc.subject.por.fl_str_mv |
Stepped spillways CFD Free surface Turbulence Pressure |
topic |
Stepped spillways CFD Free surface Turbulence Pressure |
description |
ABSTRACT The traditional approach for the hydrodynamic characterization of the flow down stepped spillways is through physical modeling, which is susceptible to scale effects and has limitations related to experimental apparatus, laboratory space and the spatial discretization of data collection. Computational fluid dynamics (CFD) is an important tool for hydrodynamic analysis because, if used properly, it presents great potential for application in hydraulics. In this work, CFD was used to model the skimming flow down a stepped spillway to investigate the effects of possible pressure measurement errors due to uncertainties in the position of the sensors within the steps. The numerical model was validated through literature velocity profiles and pressure experimental data. The results showed that the best values of water fraction (α) to define free surface are α = 0.30 in the nonaerated region and α = 0.10 in the aerated region. Statistical parameters were calculated using experimental data to estimate extreme pressures. These parameters and the simulation results were used to determine that the extreme maximum and minimum pressures occur, respectively, in the region of 0.81 < x/l < 0.98, in the horizontal faces, and in the region of 0.93 < y/h < 0.98, in the vertical faces. |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020-01-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2318-03312020000100203 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2318-03312020000100203 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/2318-0331.252020190070 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Associação Brasileira de Recursos Hídricos |
publisher.none.fl_str_mv |
Associação Brasileira de Recursos Hídricos |
dc.source.none.fl_str_mv |
RBRH v.25 2020 reponame:RBRH (Online) instname:Associação Brasileira de Recursos Hídricos (ABRH) instacron:ABRH |
instname_str |
Associação Brasileira de Recursos Hídricos (ABRH) |
instacron_str |
ABRH |
institution |
ABRH |
reponame_str |
RBRH (Online) |
collection |
RBRH (Online) |
repository.name.fl_str_mv |
RBRH (Online) - Associação Brasileira de Recursos Hídricos (ABRH) |
repository.mail.fl_str_mv |
||rbrh@abrh.org.br |
_version_ |
1754734701938999296 |