Simulation of an offset wall turbulent jet flow

Detalhes bibliográficos
Autor(a) principal: Zdanowski, Francisco
Data de Publicação: 2023
Outros Autores: Malico, Isabel
Tipo de documento: Artigo de conferência
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10174/35860
Resumo: Jet flows are commonly observed in many real-world situations, such as in the exhaust plume from a rocket, the airflow from a jet engine or combustion equipment. The jet flow is a high-speed stream of fluid expelled from a relatively narrow orifice into a surrounding fluid with a lower velocity. Factors such as the jet velocity and pressure, size and shape of the orifice, and the properties of the surrounding fluid influence the behavior and characteristics of jet flows. The turbulent offset jet is a fundamental problem due to the development of an adverse pressure gradient that causes the jet stream to deviate from the jet centerline (recirculation zone) and get in direct contact with the wall (impingement zone), both leading to increased turbulence, mixing and potentially reduced efficiency, and source of significant heat transfer or fluid-wall interactions, respectively. This study aims to model the fluid flow phenomena of a jet flow offset from a wall using Computational Fluid Dynamics (CFD) and to validate the model with experimental data published in the literature. The jet model is a 2D, incompressible and turbulent flow in which the jet is discharged into still air. Due to the presence of a lateral wall, it deflects and impinges onto a flat surface. Several RANS (Reynolds-averaged Navier–Stokes equations) turbulence and wall treatment models are tested and compared with the experimental data. The validation process was verified, and the turbulence models agreed with the experimental data. The k-ε model shows a better agreement with the experimental model to the detriment of the k-ω model. Using the k-ε model to describe 2D turbulent incompressible jet flows has shown to be a good choice according to the experimental data.
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spelling Simulation of an offset wall turbulent jet flowCFDOffset JetTurbulenceRecirculationJet flows are commonly observed in many real-world situations, such as in the exhaust plume from a rocket, the airflow from a jet engine or combustion equipment. The jet flow is a high-speed stream of fluid expelled from a relatively narrow orifice into a surrounding fluid with a lower velocity. Factors such as the jet velocity and pressure, size and shape of the orifice, and the properties of the surrounding fluid influence the behavior and characteristics of jet flows. The turbulent offset jet is a fundamental problem due to the development of an adverse pressure gradient that causes the jet stream to deviate from the jet centerline (recirculation zone) and get in direct contact with the wall (impingement zone), both leading to increased turbulence, mixing and potentially reduced efficiency, and source of significant heat transfer or fluid-wall interactions, respectively. This study aims to model the fluid flow phenomena of a jet flow offset from a wall using Computational Fluid Dynamics (CFD) and to validate the model with experimental data published in the literature. The jet model is a 2D, incompressible and turbulent flow in which the jet is discharged into still air. Due to the presence of a lateral wall, it deflects and impinges onto a flat surface. Several RANS (Reynolds-averaged Navier–Stokes equations) turbulence and wall treatment models are tested and compared with the experimental data. The validation process was verified, and the turbulence models agreed with the experimental data. The k-ε model shows a better agreement with the experimental model to the detriment of the k-ω model. Using the k-ε model to describe 2D turbulent incompressible jet flows has shown to be a good choice according to the experimental data.Eccomas2024-01-08T11:31:30Z2024-01-082023-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjecthttp://hdl.handle.net/10174/35860http://hdl.handle.net/10174/35860engZdanowski, F., Malico, I. (2023). Simulation of an offset wall turbulent jet flow (Abstract). 6th International Conference on Numerical and Symbolic Computation. Developments and Applications – SYMCOMP 2023, Évora, Portugal, 30-31 March, pp. 117.simnaonaozdanowski@uevora.ptimbm@uevora.pt286Zdanowski, FranciscoMalico, Isabelinfo: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:RCAAP2024-01-09T01:47:07Zoai:dspace.uevora.pt:10174/35860Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T01:30:54.840656Repositório 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 Simulation of an offset wall turbulent jet flow
title Simulation of an offset wall turbulent jet flow
spellingShingle Simulation of an offset wall turbulent jet flow
Zdanowski, Francisco
CFD
Offset Jet
Turbulence
Recirculation
title_short Simulation of an offset wall turbulent jet flow
title_full Simulation of an offset wall turbulent jet flow
title_fullStr Simulation of an offset wall turbulent jet flow
title_full_unstemmed Simulation of an offset wall turbulent jet flow
title_sort Simulation of an offset wall turbulent jet flow
author Zdanowski, Francisco
author_facet Zdanowski, Francisco
Malico, Isabel
author_role author
author2 Malico, Isabel
author2_role author
dc.contributor.author.fl_str_mv Zdanowski, Francisco
Malico, Isabel
dc.subject.por.fl_str_mv CFD
Offset Jet
Turbulence
Recirculation
topic CFD
Offset Jet
Turbulence
Recirculation
description Jet flows are commonly observed in many real-world situations, such as in the exhaust plume from a rocket, the airflow from a jet engine or combustion equipment. The jet flow is a high-speed stream of fluid expelled from a relatively narrow orifice into a surrounding fluid with a lower velocity. Factors such as the jet velocity and pressure, size and shape of the orifice, and the properties of the surrounding fluid influence the behavior and characteristics of jet flows. The turbulent offset jet is a fundamental problem due to the development of an adverse pressure gradient that causes the jet stream to deviate from the jet centerline (recirculation zone) and get in direct contact with the wall (impingement zone), both leading to increased turbulence, mixing and potentially reduced efficiency, and source of significant heat transfer or fluid-wall interactions, respectively. This study aims to model the fluid flow phenomena of a jet flow offset from a wall using Computational Fluid Dynamics (CFD) and to validate the model with experimental data published in the literature. The jet model is a 2D, incompressible and turbulent flow in which the jet is discharged into still air. Due to the presence of a lateral wall, it deflects and impinges onto a flat surface. Several RANS (Reynolds-averaged Navier–Stokes equations) turbulence and wall treatment models are tested and compared with the experimental data. The validation process was verified, and the turbulence models agreed with the experimental data. The k-ε model shows a better agreement with the experimental model to the detriment of the k-ω model. Using the k-ε model to describe 2D turbulent incompressible jet flows has shown to be a good choice according to the experimental data.
publishDate 2023
dc.date.none.fl_str_mv 2023-01-01T00:00:00Z
2024-01-08T11:31:30Z
2024-01-08
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dc.identifier.uri.fl_str_mv http://hdl.handle.net/10174/35860
http://hdl.handle.net/10174/35860
url http://hdl.handle.net/10174/35860
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Zdanowski, F., Malico, I. (2023). Simulation of an offset wall turbulent jet flow (Abstract). 6th International Conference on Numerical and Symbolic Computation. Developments and Applications – SYMCOMP 2023, Évora, Portugal, 30-31 March, pp. 117.
sim
nao
nao
zdanowski@uevora.pt
imbm@uevora.pt
286
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