Effects of the Reynolds number on a scale-similarity model of Lagrangian velocity correlations in isotropic turbulent flows

doi:10.1007/s10483-018-2387-6

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	Effects of the Reynolds number on a scale-similarity model of Lagrangian velocity correlations in isotropic turbulent flows
	Shi ZY(史召宇); Chen JC(陈进财); Jin GD(晋国栋)
刊名	APPLIED MATHEMATICS AND MECHANICS-ENGLISH EDITION
	2018-11-01
卷号	39 期号:11 页码:1605-1616
关键词	turbulent mixing relative dispersion Lagrangian velocity correlation scale-similarity model dispersion velocity Reynolds number effect
ISSN号	0253-4827
DOI	10.1007/s10483-018-2387-6
英文摘要	A scale-similarity model of a two-point two-time Lagrangian velocity correlation (LVC) was originally developed for the relative dispersion of tracer particles in isotropic turbulent flows (HE, G. W., JIN, G. D., and ZHAO, X. Scale-similarity model for Lagrangian velocity correlations in isotropic and stationary turbulence. Physical Review E, 80, 066313 (2009)). The model can be expressed as a two-point Eulerian space correlation and the dispersion velocity V. The dispersion velocity denotes the rate at which one moving particle departs from another fixed particle. This paper numerically validates the robustness of the scale-similarity model at high Taylor micro-scale Reynolds numbers up to 373, which are much higher than the original values (R-lambda = 66, 102). The effect of the Reynolds number on the dispersion velocity in the scale-similarity model is carefully investigated. The results show that the scale-similarity model is more accurate at higher Reynolds numbers because the two-point Lagrangian velocity correlations with different initial spatial separations collapse into a universal form compared with a combination of the initial separation and the temporal separation via the dispersion velocity. Moreover, the dispersion velocity V normalized by the Kolmogorov velocity V eta equivalent to eta/T-eta in which eta and T-eta are the Kolmogorov space and time scales, respectively, scales with the Reynolds number R-lambda as V/V-eta proportional to R-lambda(1.39) obtained from the numerical data.
分类号	二类/Q1
URL标识	查看原文
WOS关键词	DIRECT NUMERICAL SIMULATIONS ; TIME CORRELATIONS ; DISPERSION ; PARTICLES ; STATISTICS ; DIFFUSION
WOS研究方向	Mathematics, Applied ; Mechanics
语种	英语
WOS记录号	WOS:000451482500005
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/78140]
专题	力学研究所_非线性力学国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech LNM, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China 3.Sun Yat Sen Univ, Sch Engn, Guangzhou 510275, Guangdong, Peoples R China
推荐引用方式 GB/T 7714	Shi ZY,Chen JC,Jin GD. Effects of the Reynolds number on a scale-similarity model of Lagrangian velocity correlations in isotropic turbulent flows[J]. APPLIED MATHEMATICS AND MECHANICS-ENGLISH EDITION,2018,39(11):1605-1616.
APA	史召宇,陈进财,&晋国栋.(2018).Effects of the Reynolds number on a scale-similarity model of Lagrangian velocity correlations in isotropic turbulent flows.APPLIED MATHEMATICS AND MECHANICS-ENGLISH EDITION,39(11),1605-1616.
MLA	史召宇,et al."Effects of the Reynolds number on a scale-similarity model of Lagrangian velocity correlations in isotropic turbulent flows".APPLIED MATHEMATICS AND MECHANICS-ENGLISH EDITION 39.11(2018):1605-1616.