Numerical investigation of the cavitation effects on the vortex shedding from a hydrofoil with blunt trailing edge

Vortex cavitation can appear in the wake flow of hydrofoils, inducing unwanted consequences such as vibrations or unstable behaviors in hydraulic machinery and systems. To investigate the cavitation effects on hydrofoil vortex shedding, a numerical investigation of the flow around a 2D NACA0009 with...

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Autores: Chen, Jian, Geng, Linlin, Escaler Puigoriol, Francesc Xavier|||0000-0002-9374-7749
Formato: artículo
Fecha de publicación:2020
País:España
Recursos:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/335667
Acesso em linha:https://hdl.handle.net/2117/335667
https://dx.doi.org/10.3390/fluids5040218
Access Level:acceso abierto
Palavra-chave:Cavitation
Fluid mechanics
Hydrofoil
Vortex shedding
LES
Zwart
Cavitació
Mecànica de fluids
Àrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids
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oai_identifier_str oai:upcommons.upc.edu:2117/335667
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spelling Numerical investigation of the cavitation effects on the vortex shedding from a hydrofoil with blunt trailing edgeChen, JianGeng, LinlinEscaler Puigoriol, Francesc Xavier|||0000-0002-9374-7749CavitationFluid mechanicsCavitationHydrofoilVortex sheddingLESZwartCavitacióMecànica de fluidsÀrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluidsVortex cavitation can appear in the wake flow of hydrofoils, inducing unwanted consequences such as vibrations or unstable behaviors in hydraulic machinery and systems. To investigate the cavitation effects on hydrofoil vortex shedding, a numerical investigation of the flow around a 2D NACA0009 with a blunt trailing edge at free caviation conditions and at two degrees of cavitation developments has been carried out by means of the Zwart cavitation model and the LES WALE turbulence model which permits predicting the laminar to turbulent transition of the boundary layers. To analyze the dynamic behavior of the vortex shedding process and the coherent structures, two identification methods based on the Eulerian and Lagrangian reference frames have been applied to the simulated unsteady flow field. It is found that the cavitation occurrence in the wake significantly changes the main vortex shedding characteristics including the morphology of the vortices, the vortex formation length, the effective height of the near wake flow and the shedding frequency. The numerical results predict that the circular shape of the vortices changes to an elliptical one and that the vortex shedding frequency is significantly increased under cavitation conditions. The main reason for the frequency increase seems to be the reduction in the transverse separation between the upper and lower rows of vortices induced by the increase in the vortex formation length.Peer ReviewedMultidisciplinary Digital Publishing Institute (MDPI)20202020-11-2120212021-01-21journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/335667https://dx.doi.org/10.3390/fluids5040218reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution-NonCommercial-NoDerivates 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/3356672026-05-27T15:37:01Z
dc.title.none.fl_str_mv Numerical investigation of the cavitation effects on the vortex shedding from a hydrofoil with blunt trailing edge
title Numerical investigation of the cavitation effects on the vortex shedding from a hydrofoil with blunt trailing edge
spellingShingle Numerical investigation of the cavitation effects on the vortex shedding from a hydrofoil with blunt trailing edge
Chen, Jian
Cavitation
Fluid mechanics
Cavitation
Hydrofoil
Vortex shedding
LES
Zwart
Cavitació
Mecànica de fluids
Àrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids
title_short Numerical investigation of the cavitation effects on the vortex shedding from a hydrofoil with blunt trailing edge
title_full Numerical investigation of the cavitation effects on the vortex shedding from a hydrofoil with blunt trailing edge
title_fullStr Numerical investigation of the cavitation effects on the vortex shedding from a hydrofoil with blunt trailing edge
title_full_unstemmed Numerical investigation of the cavitation effects on the vortex shedding from a hydrofoil with blunt trailing edge
title_sort Numerical investigation of the cavitation effects on the vortex shedding from a hydrofoil with blunt trailing edge
dc.creator.none.fl_str_mv Chen, Jian
Geng, Linlin
Escaler Puigoriol, Francesc Xavier|||0000-0002-9374-7749
author Chen, Jian
author_facet Chen, Jian
Geng, Linlin
Escaler Puigoriol, Francesc Xavier|||0000-0002-9374-7749
author_role author
author2 Geng, Linlin
Escaler Puigoriol, Francesc Xavier|||0000-0002-9374-7749
author2_role author
author
dc.subject.none.fl_str_mv Cavitation
Fluid mechanics
Cavitation
Hydrofoil
Vortex shedding
LES
Zwart
Cavitació
Mecànica de fluids
Àrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids
topic Cavitation
Fluid mechanics
Cavitation
Hydrofoil
Vortex shedding
LES
Zwart
Cavitació
Mecànica de fluids
Àrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids
description Vortex cavitation can appear in the wake flow of hydrofoils, inducing unwanted consequences such as vibrations or unstable behaviors in hydraulic machinery and systems. To investigate the cavitation effects on hydrofoil vortex shedding, a numerical investigation of the flow around a 2D NACA0009 with a blunt trailing edge at free caviation conditions and at two degrees of cavitation developments has been carried out by means of the Zwart cavitation model and the LES WALE turbulence model which permits predicting the laminar to turbulent transition of the boundary layers. To analyze the dynamic behavior of the vortex shedding process and the coherent structures, two identification methods based on the Eulerian and Lagrangian reference frames have been applied to the simulated unsteady flow field. It is found that the cavitation occurrence in the wake significantly changes the main vortex shedding characteristics including the morphology of the vortices, the vortex formation length, the effective height of the near wake flow and the shedding frequency. The numerical results predict that the circular shape of the vortices changes to an elliptical one and that the vortex shedding frequency is significantly increased under cavitation conditions. The main reason for the frequency increase seems to be the reduction in the transverse separation between the upper and lower rows of vortices induced by the increase in the vortex formation length.
publishDate 2020
dc.date.none.fl_str_mv 2020
2020-11-21
2021
2021-01-21
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/335667
https://dx.doi.org/10.3390/fluids5040218
url https://hdl.handle.net/2117/335667
https://dx.doi.org/10.3390/fluids5040218
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivates 4.0 International
http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivates 4.0 International
http://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Multidisciplinary Digital Publishing Institute (MDPI)
publisher.none.fl_str_mv Multidisciplinary Digital Publishing Institute (MDPI)
dc.source.none.fl_str_mv reponame:UPCommons. Portal del coneixement obert de la UPC
instname:Universitat Politècnica de Catalunya (UPC)
instname_str Universitat Politècnica de Catalunya (UPC)
reponame_str UPCommons. Portal del coneixement obert de la UPC
collection UPCommons. Portal del coneixement obert de la UPC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,300719

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