Instability onset for submerged cylinders

Autores
González-Gutierrez, Leo M.; Gimenez, Juan Marcelo; Ferrer, Esteban
Año de publicación
2019
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
This paper describes how the global stability of a circular cylinder is affected when submerged in a two-phase gravitational flow. The flow behavior is governed by both the Reynolds and the Froude number, while the depth of the cylinder has been varied to create different scenarios for the stability analysis. The baseflow obtained by the numerical solution of the 2D Navier-Stokes equations has been analyzed, and the first bifurcation (i.e. Hopf type) has been explored for different depths, Reynolds and Froude numbers. In addition to the typical vortex shedding instabilities associated to isolated cylinders, the presence of an interface between fluids creates new instabilities associated with the free surface that present more complex and deformed structures. According to the region of the parameter space studied here, two main causes of instabilities have been found: the ones provoked by vortex shedding on the cylinder wake (wake instabilities) at low Froude numbers and the ones produced by the free surface deformation (free surface instabilities) at high Froude numbers. When instabilities are related to vortex shedding, the critical Reynolds number and the frequency of the most unstable mode are comparable to the classical solution without free surface and gravity effects. In all cases, the shape of the most unstable mode is deformed and distorted according to the free surface location, while the critical Reynolds numbers and the frequency associated to the perturbation are both affected by the gravity and the free surface presence.
Fil: González-Gutierrez, Leo M.. Universidad Politécnica de Madrid; España
Fil: Gimenez, Juan Marcelo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Centro de Investigaciones en Métodos Computacionales. Universidad Nacional del Litoral. Centro de Investigaciones en Métodos Computacionales; Argentina
Fil: Ferrer, Esteban. Universidad Politécnica de Madrid; España
Materia
INSTABILITY ANALYSIS
SUBMERGED CYLINDER
TWO-PHASE
OPEN FOAM
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/113590
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/113590
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Instability onset for submerged cylindersGonzález-Gutierrez, Leo M.Gimenez, Juan MarceloFerrer, EstebanINSTABILITY ANALYSISSUBMERGED CYLINDERTWO-PHASEOPEN FOAMhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1This paper describes how the global stability of a circular cylinder is affected when submerged in a two-phase gravitational flow. The flow behavior is governed by both the Reynolds and the Froude number, while the depth of the cylinder has been varied to create different scenarios for the stability analysis. The baseflow obtained by the numerical solution of the 2D Navier-Stokes equations has been analyzed, and the first bifurcation (i.e. Hopf type) has been explored for different depths, Reynolds and Froude numbers. In addition to the typical vortex shedding instabilities associated to isolated cylinders, the presence of an interface between fluids creates new instabilities associated with the free surface that present more complex and deformed structures. According to the region of the parameter space studied here, two main causes of instabilities have been found: the ones provoked by vortex shedding on the cylinder wake (wake instabilities) at low Froude numbers and the ones produced by the free surface deformation (free surface instabilities) at high Froude numbers. When instabilities are related to vortex shedding, the critical Reynolds number and the frequency of the most unstable mode are comparable to the classical solution without free surface and gravity effects. In all cases, the shape of the most unstable mode is deformed and distorted according to the free surface location, while the critical Reynolds numbers and the frequency associated to the perturbation are both affected by the gravity and the free surface presence.Fil: González-Gutierrez, Leo M.. Universidad Politécnica de Madrid; EspañaFil: Gimenez, Juan Marcelo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Centro de Investigaciones en Métodos Computacionales. Universidad Nacional del Litoral. Centro de Investigaciones en Métodos Computacionales; ArgentinaFil: Ferrer, Esteban. Universidad Politécnica de Madrid; EspañaAmerican Institute of Physics2019-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/113590González-Gutierrez, Leo M.; Gimenez, Juan Marcelo; Ferrer, Esteban; Instability onset for submerged cylinders; American Institute of Physics; Physics of Fluids; 31; 1; 1-20191070-6631CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/http://aip.scitation.org/doi/10.1063/1.5063327info:eu-repo/semantics/altIdentifier/doi/10.1063/1.5063327info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T10:07:49Zoai:ri.conicet.gov.ar:11336/113590instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-03 10:07:49.848CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Instability onset for submerged cylinders
title Instability onset for submerged cylinders
spellingShingle Instability onset for submerged cylinders
González-Gutierrez, Leo M.
INSTABILITY ANALYSIS
SUBMERGED CYLINDER
TWO-PHASE
OPEN FOAM
title_short Instability onset for submerged cylinders
title_full Instability onset for submerged cylinders
title_fullStr Instability onset for submerged cylinders
title_full_unstemmed Instability onset for submerged cylinders
title_sort Instability onset for submerged cylinders
dc.creator.none.fl_str_mv González-Gutierrez, Leo M.
Gimenez, Juan Marcelo
Ferrer, Esteban
author González-Gutierrez, Leo M.
author_facet González-Gutierrez, Leo M.
Gimenez, Juan Marcelo
Ferrer, Esteban
author_role author
author2 Gimenez, Juan Marcelo
Ferrer, Esteban
author2_role author
author
dc.subject.none.fl_str_mv INSTABILITY ANALYSIS
SUBMERGED CYLINDER
TWO-PHASE
OPEN FOAM
topic INSTABILITY ANALYSIS
SUBMERGED CYLINDER
TWO-PHASE
OPEN FOAM
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv This paper describes how the global stability of a circular cylinder is affected when submerged in a two-phase gravitational flow. The flow behavior is governed by both the Reynolds and the Froude number, while the depth of the cylinder has been varied to create different scenarios for the stability analysis. The baseflow obtained by the numerical solution of the 2D Navier-Stokes equations has been analyzed, and the first bifurcation (i.e. Hopf type) has been explored for different depths, Reynolds and Froude numbers. In addition to the typical vortex shedding instabilities associated to isolated cylinders, the presence of an interface between fluids creates new instabilities associated with the free surface that present more complex and deformed structures. According to the region of the parameter space studied here, two main causes of instabilities have been found: the ones provoked by vortex shedding on the cylinder wake (wake instabilities) at low Froude numbers and the ones produced by the free surface deformation (free surface instabilities) at high Froude numbers. When instabilities are related to vortex shedding, the critical Reynolds number and the frequency of the most unstable mode are comparable to the classical solution without free surface and gravity effects. In all cases, the shape of the most unstable mode is deformed and distorted according to the free surface location, while the critical Reynolds numbers and the frequency associated to the perturbation are both affected by the gravity and the free surface presence.
Fil: González-Gutierrez, Leo M.. Universidad Politécnica de Madrid; España
Fil: Gimenez, Juan Marcelo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Centro de Investigaciones en Métodos Computacionales. Universidad Nacional del Litoral. Centro de Investigaciones en Métodos Computacionales; Argentina
Fil: Ferrer, Esteban. Universidad Politécnica de Madrid; España
description This paper describes how the global stability of a circular cylinder is affected when submerged in a two-phase gravitational flow. The flow behavior is governed by both the Reynolds and the Froude number, while the depth of the cylinder has been varied to create different scenarios for the stability analysis. The baseflow obtained by the numerical solution of the 2D Navier-Stokes equations has been analyzed, and the first bifurcation (i.e. Hopf type) has been explored for different depths, Reynolds and Froude numbers. In addition to the typical vortex shedding instabilities associated to isolated cylinders, the presence of an interface between fluids creates new instabilities associated with the free surface that present more complex and deformed structures. According to the region of the parameter space studied here, two main causes of instabilities have been found: the ones provoked by vortex shedding on the cylinder wake (wake instabilities) at low Froude numbers and the ones produced by the free surface deformation (free surface instabilities) at high Froude numbers. When instabilities are related to vortex shedding, the critical Reynolds number and the frequency of the most unstable mode are comparable to the classical solution without free surface and gravity effects. In all cases, the shape of the most unstable mode is deformed and distorted according to the free surface location, while the critical Reynolds numbers and the frequency associated to the perturbation are both affected by the gravity and the free surface presence.
publishDate 2019
dc.date.none.fl_str_mv 2019-01
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/113590
González-Gutierrez, Leo M.; Gimenez, Juan Marcelo; Ferrer, Esteban; Instability onset for submerged cylinders; American Institute of Physics; Physics of Fluids; 31; 1; 1-2019
1070-6631
CONICET Digital
CONICET
url http://hdl.handle.net/11336/113590
identifier_str_mv González-Gutierrez, Leo M.; Gimenez, Juan Marcelo; Ferrer, Esteban; Instability onset for submerged cylinders; American Institute of Physics; Physics of Fluids; 31; 1; 1-2019
1070-6631
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://aip.scitation.org/doi/10.1063/1.5063327
info:eu-repo/semantics/altIdentifier/doi/10.1063/1.5063327
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv American Institute of Physics
publisher.none.fl_str_mv American Institute of Physics
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.13397

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