Scale-similarity model for Lagrangian velocity correlations in isotropic and stationary turbulence

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	Scale-similarity model for Lagrangian velocity correlations in isotropic and stationary turbulence
	He GW(何国威); Jin GD(晋国栋); Zhao X(赵欣)
刊名	Physical Review E
	2009
通讯作者邮箱	hgw@lnm.imech.ac.cn
卷号	80 期号:6 页码:066313(1-7)
ISSN号	1539-3755
通讯作者	Guowei He
合作状况	其它
中文摘要	A scale-similarity model for Lagrangian two-point, two-time velocity correlations LVCs in isotropic turbulence is developed from the Kolmogorov similarity hypothesis. It is a second approximation to the isocontours of LVCs, while the Smith-Hay model is only a first approximation. This model expresses the LVC by its space correlation and a dispersion velocity. We derive the analytical expression for the dispersion velocity from the Navier-Stokes equations using the quasinormality assumption. The dispersion velocity is dependent on enstrophy spectra and shown to be smaller than the sweeping velocity for the Eulerian velocity correlation. Therefore, the Lagrangian decorrelation process is slower than the Eulerian decorrelation process. The data from direct numerical simulation of isotropic turbulence support the scale-similarity model: the LVCs for different space separations collapse into a universal form when plotted against the separation axis defined by the model.
学科主题	流体力学
收录类别	SCI
语种	英语
WOS记录号	WOS:000273228000061
公开日期	2009-12-28
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/32984]
专题	力学研究所_非线性力学国家重点实验室
推荐引用方式 GB/T 7714	He GW,Jin GD,Zhao X. Scale-similarity model for Lagrangian velocity correlations in isotropic and stationary turbulence[J]. Physical Review E,2009,80(6):066313(1-7).
APA	He GW,Jin GD,&Zhao X.(2009).Scale-similarity model for Lagrangian velocity correlations in isotropic and stationary turbulence.Physical Review E,80(6),066313(1-7).
MLA	He GW,et al."Scale-similarity model for Lagrangian velocity correlations in isotropic and stationary turbulence".Physical Review E 80.6(2009):066313(1-7).