Numerical Study on Plane and Radial Wall Jets to Validate the 2D Assumption for an Idealized Downburst Outflow

Turbulent radial and plane wall jets have been extensively investigated both experimentally and numerically over the past few decades. Previous studies mostly focused on the heat and mass transfers involved in jet flows. In this study, a comprehensive investigation was conducted on turbulent radial...

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Autores principales:	Yongli Zhong, Zhitao Yan, Yan Li, Jie Luo, Hua Zhang
Formato:	article
Lenguaje:	EN
Publicado:	Hindawi Limited 2021
Materias:	Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/44f5b2ebec2643c28fd182106c200e36
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spelling	oai:doaj.org-article:44f5b2ebec2643c28fd182106c200e362021-11-22T01:11:17ZNumerical Study on Plane and Radial Wall Jets to Validate the 2D Assumption for an Idealized Downburst Outflow1687-809410.1155/2021/9993981https://doaj.org/article/44f5b2ebec2643c28fd182106c200e362021-01-01T00:00:00Zhttp://dx.doi.org/10.1155/2021/9993981https://doaj.org/toc/1687-8094Turbulent radial and plane wall jets have been extensively investigated both experimentally and numerically over the past few decades. Previous studies mostly focused on the heat and mass transfers involved in jet flows. In this study, a comprehensive investigation was conducted on turbulent radial and plane wall jets, considering both jet spread and velocity decay for different parameters. The numerical results were compared with existing experimental measurements. The comparison focused on the velocity profile, jet spread, and velocity decay, and revealed that the Reynolds stress model (RSM) performs well in the simulation of both radial and plane wall jets. The results show that with a typical ratio of cloud base height to diameter for most downburst events, the effects of nozzle height and Reynolds number on the evolution of the radial wall jet are not significant. Both the jet spread and velocity decay exhibit a clear dependence on the Reynolds number below a critical value. Above this critical value, the plane wall jet becomes asymptotically independent of the Reynolds number. The co-flow was found to have a significant influence on the evolution of the plane wall jet. Comparatively, the jet spread and velocity of the radial wall jet were faster than those of the plane jet. For applications in civil engineering, it is valid to approximate the downburst outflow with a two-dimensional (2D) assumption from the perspective of longitudinal evolution of the flows.Yongli ZhongZhitao YanYan LiJie LuoHua ZhangHindawi LimitedarticleEngineering (General). Civil engineering (General)TA1-2040ENAdvances in Civil Engineering, Vol 2021 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	Engineering (General). Civil engineering (General) TA1-2040 Yongli Zhong Zhitao Yan Yan Li Jie Luo Hua Zhang Numerical Study on Plane and Radial Wall Jets to Validate the 2D Assumption for an Idealized Downburst Outflow
description	Turbulent radial and plane wall jets have been extensively investigated both experimentally and numerically over the past few decades. Previous studies mostly focused on the heat and mass transfers involved in jet flows. In this study, a comprehensive investigation was conducted on turbulent radial and plane wall jets, considering both jet spread and velocity decay for different parameters. The numerical results were compared with existing experimental measurements. The comparison focused on the velocity profile, jet spread, and velocity decay, and revealed that the Reynolds stress model (RSM) performs well in the simulation of both radial and plane wall jets. The results show that with a typical ratio of cloud base height to diameter for most downburst events, the effects of nozzle height and Reynolds number on the evolution of the radial wall jet are not significant. Both the jet spread and velocity decay exhibit a clear dependence on the Reynolds number below a critical value. Above this critical value, the plane wall jet becomes asymptotically independent of the Reynolds number. The co-flow was found to have a significant influence on the evolution of the plane wall jet. Comparatively, the jet spread and velocity of the radial wall jet were faster than those of the plane jet. For applications in civil engineering, it is valid to approximate the downburst outflow with a two-dimensional (2D) assumption from the perspective of longitudinal evolution of the flows.
format	article
author	Yongli Zhong Zhitao Yan Yan Li Jie Luo Hua Zhang
author_facet	Yongli Zhong Zhitao Yan Yan Li Jie Luo Hua Zhang
author_sort	Yongli Zhong
title	Numerical Study on Plane and Radial Wall Jets to Validate the 2D Assumption for an Idealized Downburst Outflow
title_short	Numerical Study on Plane and Radial Wall Jets to Validate the 2D Assumption for an Idealized Downburst Outflow
title_full	Numerical Study on Plane and Radial Wall Jets to Validate the 2D Assumption for an Idealized Downburst Outflow
title_fullStr	Numerical Study on Plane and Radial Wall Jets to Validate the 2D Assumption for an Idealized Downburst Outflow
title_full_unstemmed	Numerical Study on Plane and Radial Wall Jets to Validate the 2D Assumption for an Idealized Downburst Outflow
title_sort	numerical study on plane and radial wall jets to validate the 2d assumption for an idealized downburst outflow
publisher	Hindawi Limited
publishDate	2021
url	https://doaj.org/article/44f5b2ebec2643c28fd182106c200e36
work_keys_str_mv	AT yonglizhong numericalstudyonplaneandradialwalljetstovalidatethe2dassumptionforanidealizeddownburstoutflow AT zhitaoyan numericalstudyonplaneandradialwalljetstovalidatethe2dassumptionforanidealizeddownburstoutflow AT yanli numericalstudyonplaneandradialwalljetstovalidatethe2dassumptionforanidealizeddownburstoutflow AT jieluo numericalstudyonplaneandradialwalljetstovalidatethe2dassumptionforanidealizeddownburstoutflow AT huazhang numericalstudyonplaneandradialwalljetstovalidatethe2dassumptionforanidealizeddownburstoutflow
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Numerical Study on Plane and Radial Wall Jets to Validate the 2D Assumption for an Idealized Downburst Outflow

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