Multiscale simulation of flow in gas-lubricated journal bearings: A comparative study between the Reynolds equation and lattice Boltzmann methods

On account of varying tiny cross-sectional clearance and fairly high bearing speed, the feature of lubricant gas of gas-lubricated journal bearings (GLJBs) is a complex multiscale problem. In this research, both macroscopic Reynolds equation and mesoscopic lattice Boltzmann methods (LBM) are adopted...

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Autores principales:	Yulong Jiang, Bo Xu, Xiangyu Lu, Huanchun Yu, Xinyang Luo, Zhenqian Chen
Formato:	article
Lenguaje:	EN
Publicado:	Taylor & Francis Group 2021
Materias:	gas-lubricated journal bearing (gljb) multiscale flow reynolds equation lattice boltzmann method (lbm) boundary-condtion Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/fee73e67f7774a7f8a83dd59e9eddf55
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spelling	oai:doaj.org-article:fee73e67f7774a7f8a83dd59e9eddf552021-11-11T14:23:42ZMultiscale simulation of flow in gas-lubricated journal bearings: A comparative study between the Reynolds equation and lattice Boltzmann methods1994-20601997-003X10.1080/19942060.2021.1987330https://doaj.org/article/fee73e67f7774a7f8a83dd59e9eddf552021-01-01T00:00:00Zhttp://dx.doi.org/10.1080/19942060.2021.1987330https://doaj.org/toc/1994-2060https://doaj.org/toc/1997-003XOn account of varying tiny cross-sectional clearance and fairly high bearing speed, the feature of lubricant gas of gas-lubricated journal bearings (GLJBs) is a complex multiscale problem. In this research, both macroscopic Reynolds equation and mesoscopic lattice Boltzmann methods (LBM) are adopted to successfully establish models for restoring flow characteristics of GLJBs from continuum, slip to transition flow regimes. The influences of eccentricity ratios, bearing speeds and Knudsen numbers (Kn) on pressure, thickness, velocity distributions and flow fields of lubricant flow are investigated. The distinctions between the results through two methods, which can be complementary, are compared and analyzed with maximum error ≯9.6%. It indicates that keeping the eccentricity ratio or bearing speed at appropriate high levels is good for improving its working performance. When Kn is enhanced, the maximum and minimum pressure peaks will decrease and increase, respectively, whereas, the impact degree of rarefaction effect on the pressure distribution will reduce after Kn exceeding a certain level. Besides, an interesting backflow phenomenon in the lubricant flow field is demonstrated. This investigation enriches numerical models for GLJBs at different flow regimes, and provides new fruitful insights into the flow characteristics at multiscale.Yulong JiangBo XuXiangyu LuHuanchun YuXinyang LuoZhenqian ChenTaylor & Francis Grouparticlegas-lubricated journal bearing (gljb)multiscale flowreynolds equationlattice boltzmann method (lbm)boundary-condtionEngineering (General). Civil engineering (General)TA1-2040ENEngineering Applications of Computational Fluid Mechanics, Vol 15, Iss 1, Pp 1792-1810 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	gas-lubricated journal bearing (gljb) multiscale flow reynolds equation lattice boltzmann method (lbm) boundary-condtion Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	gas-lubricated journal bearing (gljb) multiscale flow reynolds equation lattice boltzmann method (lbm) boundary-condtion Engineering (General). Civil engineering (General) TA1-2040 Yulong Jiang Bo Xu Xiangyu Lu Huanchun Yu Xinyang Luo Zhenqian Chen Multiscale simulation of flow in gas-lubricated journal bearings: A comparative study between the Reynolds equation and lattice Boltzmann methods
description	On account of varying tiny cross-sectional clearance and fairly high bearing speed, the feature of lubricant gas of gas-lubricated journal bearings (GLJBs) is a complex multiscale problem. In this research, both macroscopic Reynolds equation and mesoscopic lattice Boltzmann methods (LBM) are adopted to successfully establish models for restoring flow characteristics of GLJBs from continuum, slip to transition flow regimes. The influences of eccentricity ratios, bearing speeds and Knudsen numbers (Kn) on pressure, thickness, velocity distributions and flow fields of lubricant flow are investigated. The distinctions between the results through two methods, which can be complementary, are compared and analyzed with maximum error ≯9.6%. It indicates that keeping the eccentricity ratio or bearing speed at appropriate high levels is good for improving its working performance. When Kn is enhanced, the maximum and minimum pressure peaks will decrease and increase, respectively, whereas, the impact degree of rarefaction effect on the pressure distribution will reduce after Kn exceeding a certain level. Besides, an interesting backflow phenomenon in the lubricant flow field is demonstrated. This investigation enriches numerical models for GLJBs at different flow regimes, and provides new fruitful insights into the flow characteristics at multiscale.
format	article
author	Yulong Jiang Bo Xu Xiangyu Lu Huanchun Yu Xinyang Luo Zhenqian Chen
author_facet	Yulong Jiang Bo Xu Xiangyu Lu Huanchun Yu Xinyang Luo Zhenqian Chen
author_sort	Yulong Jiang
title	Multiscale simulation of flow in gas-lubricated journal bearings: A comparative study between the Reynolds equation and lattice Boltzmann methods
title_short	Multiscale simulation of flow in gas-lubricated journal bearings: A comparative study between the Reynolds equation and lattice Boltzmann methods
title_full	Multiscale simulation of flow in gas-lubricated journal bearings: A comparative study between the Reynolds equation and lattice Boltzmann methods
title_fullStr	Multiscale simulation of flow in gas-lubricated journal bearings: A comparative study between the Reynolds equation and lattice Boltzmann methods
title_full_unstemmed	Multiscale simulation of flow in gas-lubricated journal bearings: A comparative study between the Reynolds equation and lattice Boltzmann methods
title_sort	multiscale simulation of flow in gas-lubricated journal bearings: a comparative study between the reynolds equation and lattice boltzmann methods
publisher	Taylor & Francis Group
publishDate	2021
url	https://doaj.org/article/fee73e67f7774a7f8a83dd59e9eddf55
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Multiscale simulation of flow in gas-lubricated journal bearings: A comparative study between the Reynolds equation and lattice Boltzmann methods

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