Detailed calibration of eddy viscosity turbulence models for incipient cavitating flow predictions in asymmetrical nozzel of injectors/atomizers

Autores
Coussirat, Miguel; Moll, Flavio
Año de publicación
2019
Idioma
inglés
Tipo de recurso
artículo
Estado
versión aceptada
Descripción
Cavitation in pressure injectors/atomizers strongly affects the liquid/spray jet behavior at its outlet. The type of atomization induced by cavitation allows developing more efficient devices if this cavitation state is controlled. Cavitating flow is related to turbulent and multiphase flows with mass transfer between the liquid and its gaseous phase. It is affected by several factors such as local pressure, local state of the turbulence, non-condensable dissolved gas concentration, nozzle geometry and others. Due to the high speed flow and small spatial and time scales involved, the study of cavitating flows by physical experiments is very expensive. On the other hand, several codes for numerical modeling of cavitating flows have been developed, but turbulent multiphase flow modeling is still a big challenge. Previous works showed that it is possible to capture several of the incipient cavitating flow characteristics performing a careful calibration of the Eddy Viscosity Models in nozzles with symmetrical inlet geometry and with round or square outlet sections. This work extends the study to nozzles with asymmetrical inlet geometry and square outlet section. It was demonstrated in previous works that a careful calibration task should be necessary, because there is a close relation between the cavitation inception/developing condition and the turbulence level in the flow leading to a ‘nonstandard turbulence state’. The spatial distribution and the slow decay of the turbulence level produced by cavitation could be related to some preferred turbulence scales in the process, so cavitating flows should not be modeled as typical turbulence. It is showed that based on the special characteristics of the incipient/slightly developed cavitating flows, a suitable calibration of the turbulence models allows obtaining improved results. These results become competitive when they are compared against ones computed by Large Eddy Simulations which need a lot of computational resources and an appropriate initial solution for running. It was also demonstrated that suppressing by calibration the level of the eddy viscosity in certain zones the vapor fraction predicted rises, provoking the incipient cavitation state in the flow. The obtained conclusions could be useful to improve injectors design using numerical modeling, because the detection of the incipient cavitation flow condition, useful to improve the atomization, could be captured accurately.
Fil: Universidad Tecnológica Nacional. Facultad Regional Mendoza, Argentina
Peer Reviewed
Fuente
Mecánica Computacional 37, 1013-1022.(2019)
Materia
Cavitation, Injectors, Atomizers, Turbulence, Eddy viscosity models, Validation/Calibration.
Nivel de accesibilidad
acceso abierto
Condiciones de uso
2024-04-05T16:03:05Z
Repositorio
Repositorio Institucional Abierto (UTN)
Institución
Universidad Tecnológica Nacional
OAI Identificador
oai:ria.utn.edu.ar:20.500.12272/10353
Acceder
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network_acronym_str RIAUTN
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network_name_str Repositorio Institucional Abierto (UTN)
spelling Detailed calibration of eddy viscosity turbulence models for incipient cavitating flow predictions in asymmetrical nozzel of injectors/atomizersCoussirat, MiguelMoll, FlavioCavitation, Injectors, Atomizers, Turbulence, Eddy viscosity models, Validation/Calibration.Cavitation in pressure injectors/atomizers strongly affects the liquid/spray jet behavior at its outlet. The type of atomization induced by cavitation allows developing more efficient devices if this cavitation state is controlled. Cavitating flow is related to turbulent and multiphase flows with mass transfer between the liquid and its gaseous phase. It is affected by several factors such as local pressure, local state of the turbulence, non-condensable dissolved gas concentration, nozzle geometry and others. Due to the high speed flow and small spatial and time scales involved, the study of cavitating flows by physical experiments is very expensive. On the other hand, several codes for numerical modeling of cavitating flows have been developed, but turbulent multiphase flow modeling is still a big challenge. Previous works showed that it is possible to capture several of the incipient cavitating flow characteristics performing a careful calibration of the Eddy Viscosity Models in nozzles with symmetrical inlet geometry and with round or square outlet sections. This work extends the study to nozzles with asymmetrical inlet geometry and square outlet section. It was demonstrated in previous works that a careful calibration task should be necessary, because there is a close relation between the cavitation inception/developing condition and the turbulence level in the flow leading to a ‘nonstandard turbulence state’. The spatial distribution and the slow decay of the turbulence level produced by cavitation could be related to some preferred turbulence scales in the process, so cavitating flows should not be modeled as typical turbulence. It is showed that based on the special characteristics of the incipient/slightly developed cavitating flows, a suitable calibration of the turbulence models allows obtaining improved results. These results become competitive when they are compared against ones computed by Large Eddy Simulations which need a lot of computational resources and an appropriate initial solution for running. It was also demonstrated that suppressing by calibration the level of the eddy viscosity in certain zones the vapor fraction predicted rises, provoking the incipient cavitation state in the flow. The obtained conclusions could be useful to improve injectors design using numerical modeling, because the detection of the incipient cavitation flow condition, useful to improve the atomization, could be captured accurately.Fil: Universidad Tecnológica Nacional. Facultad Regional Mendoza, ArgentinaPeer Reviewed2024-04-05T16:03:05Z2024-04-05T16:03:05Z2019-11-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articulopdfapplication/pdfMecánica Computacional Vol XXXVII2591-3522http://hdl.handle.net/20.500.12272/10353Mecánica Computacional 37, 1013-1022.(2019)reponame:Repositorio Institucional Abierto (UTN)instname:Universidad Tecnológica Nacionalenginfo:eu-repo/semantics/openAccess2024-04-05T16:03:05Zhttp://creativecommons.org/publicdomain/zero/1.0/CC0 1.0 UniversalUniversidad Tecnológica Nacional. Facultad Regional MendozaAtribución2026-09-24T12:45:55Zoai:ria.utn.edu.ar:20.500.12272/10353instacron:UTNInstitucionalhttp://ria.utn.edu.ar/Universidad públicaNo correspondehttp://ria.utn.edu.ar/oaigestionria@rec.utn.edu.ar; fsuarez@rec.utn.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:a2026-09-24 12:45:55.99Repositorio Institucional Abierto (UTN) - Universidad Tecnológica Nacionalfalse
dc.title.none.fl_str_mv Detailed calibration of eddy viscosity turbulence models for incipient cavitating flow predictions in asymmetrical nozzel of injectors/atomizers
title Detailed calibration of eddy viscosity turbulence models for incipient cavitating flow predictions in asymmetrical nozzel of injectors/atomizers
spellingShingle Detailed calibration of eddy viscosity turbulence models for incipient cavitating flow predictions in asymmetrical nozzel of injectors/atomizers
Coussirat, Miguel
Cavitation, Injectors, Atomizers, Turbulence, Eddy viscosity models, Validation/Calibration.
title_short Detailed calibration of eddy viscosity turbulence models for incipient cavitating flow predictions in asymmetrical nozzel of injectors/atomizers
title_full Detailed calibration of eddy viscosity turbulence models for incipient cavitating flow predictions in asymmetrical nozzel of injectors/atomizers
title_fullStr Detailed calibration of eddy viscosity turbulence models for incipient cavitating flow predictions in asymmetrical nozzel of injectors/atomizers
title_full_unstemmed Detailed calibration of eddy viscosity turbulence models for incipient cavitating flow predictions in asymmetrical nozzel of injectors/atomizers
title_sort Detailed calibration of eddy viscosity turbulence models for incipient cavitating flow predictions in asymmetrical nozzel of injectors/atomizers
dc.creator.none.fl_str_mv Coussirat, Miguel
Moll, Flavio
author Coussirat, Miguel
author_facet Coussirat, Miguel
Moll, Flavio
author_role author
author2 Moll, Flavio
author2_role author
dc.subject.none.fl_str_mv Cavitation, Injectors, Atomizers, Turbulence, Eddy viscosity models, Validation/Calibration.
topic Cavitation, Injectors, Atomizers, Turbulence, Eddy viscosity models, Validation/Calibration.
dc.description.none.fl_txt_mv Cavitation in pressure injectors/atomizers strongly affects the liquid/spray jet behavior at its outlet. The type of atomization induced by cavitation allows developing more efficient devices if this cavitation state is controlled. Cavitating flow is related to turbulent and multiphase flows with mass transfer between the liquid and its gaseous phase. It is affected by several factors such as local pressure, local state of the turbulence, non-condensable dissolved gas concentration, nozzle geometry and others. Due to the high speed flow and small spatial and time scales involved, the study of cavitating flows by physical experiments is very expensive. On the other hand, several codes for numerical modeling of cavitating flows have been developed, but turbulent multiphase flow modeling is still a big challenge. Previous works showed that it is possible to capture several of the incipient cavitating flow characteristics performing a careful calibration of the Eddy Viscosity Models in nozzles with symmetrical inlet geometry and with round or square outlet sections. This work extends the study to nozzles with asymmetrical inlet geometry and square outlet section. It was demonstrated in previous works that a careful calibration task should be necessary, because there is a close relation between the cavitation inception/developing condition and the turbulence level in the flow leading to a ‘nonstandard turbulence state’. The spatial distribution and the slow decay of the turbulence level produced by cavitation could be related to some preferred turbulence scales in the process, so cavitating flows should not be modeled as typical turbulence. It is showed that based on the special characteristics of the incipient/slightly developed cavitating flows, a suitable calibration of the turbulence models allows obtaining improved results. These results become competitive when they are compared against ones computed by Large Eddy Simulations which need a lot of computational resources and an appropriate initial solution for running. It was also demonstrated that suppressing by calibration the level of the eddy viscosity in certain zones the vapor fraction predicted rises, provoking the incipient cavitation state in the flow. The obtained conclusions could be useful to improve injectors design using numerical modeling, because the detection of the incipient cavitation flow condition, useful to improve the atomization, could be captured accurately.
Fil: Universidad Tecnológica Nacional. Facultad Regional Mendoza, Argentina
Peer Reviewed
description Cavitation in pressure injectors/atomizers strongly affects the liquid/spray jet behavior at its outlet. The type of atomization induced by cavitation allows developing more efficient devices if this cavitation state is controlled. Cavitating flow is related to turbulent and multiphase flows with mass transfer between the liquid and its gaseous phase. It is affected by several factors such as local pressure, local state of the turbulence, non-condensable dissolved gas concentration, nozzle geometry and others. Due to the high speed flow and small spatial and time scales involved, the study of cavitating flows by physical experiments is very expensive. On the other hand, several codes for numerical modeling of cavitating flows have been developed, but turbulent multiphase flow modeling is still a big challenge. Previous works showed that it is possible to capture several of the incipient cavitating flow characteristics performing a careful calibration of the Eddy Viscosity Models in nozzles with symmetrical inlet geometry and with round or square outlet sections. This work extends the study to nozzles with asymmetrical inlet geometry and square outlet section. It was demonstrated in previous works that a careful calibration task should be necessary, because there is a close relation between the cavitation inception/developing condition and the turbulence level in the flow leading to a ‘nonstandard turbulence state’. The spatial distribution and the slow decay of the turbulence level produced by cavitation could be related to some preferred turbulence scales in the process, so cavitating flows should not be modeled as typical turbulence. It is showed that based on the special characteristics of the incipient/slightly developed cavitating flows, a suitable calibration of the turbulence models allows obtaining improved results. These results become competitive when they are compared against ones computed by Large Eddy Simulations which need a lot of computational resources and an appropriate initial solution for running. It was also demonstrated that suppressing by calibration the level of the eddy viscosity in certain zones the vapor fraction predicted rises, provoking the incipient cavitation state in the flow. The obtained conclusions could be useful to improve injectors design using numerical modeling, because the detection of the incipient cavitation flow condition, useful to improve the atomization, could be captured accurately.
publishDate 2019
dc.date.none.fl_str_mv 2019-11-01
2024-04-05T16:03:05Z
2024-04-05T16:03:05Z
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv Mecánica Computacional Vol XXXVII
2591-3522
http://hdl.handle.net/20.500.12272/10353
identifier_str_mv Mecánica Computacional Vol XXXVII
2591-3522
url http://hdl.handle.net/20.500.12272/10353
dc.language.none.fl_str_mv eng
language eng
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
2024-04-05T16:03:05Z
http://creativecommons.org/publicdomain/zero/1.0/
CC0 1.0 Universal
Universidad Tecnológica Nacional. Facultad Regional Mendoza
Atribución
eu_rights_str_mv openAccess
rights_invalid_str_mv 2024-04-05T16:03:05Z
http://creativecommons.org/publicdomain/zero/1.0/
CC0 1.0 Universal
Universidad Tecnológica Nacional. Facultad Regional Mendoza
Atribución
dc.format.none.fl_str_mv pdf
application/pdf
dc.source.none.fl_str_mv Mecánica Computacional 37, 1013-1022.(2019)
reponame:Repositorio Institucional Abierto (UTN)
instname:Universidad Tecnológica Nacional
reponame_str Repositorio Institucional Abierto (UTN)
collection Repositorio Institucional Abierto (UTN)
instname_str Universidad Tecnológica Nacional
repository.name.fl_str_mv Repositorio Institucional Abierto (UTN) - Universidad Tecnológica Nacional
repository.mail.fl_str_mv gestionria@rec.utn.edu.ar; fsuarez@rec.utn.edu.ar
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score 13.24418

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