Short-time evolution of Lagrangian velocity gradient correlations in isotropic turbulence

doi:10.1063/1.4936140

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	Short-time evolution of Lagrangian velocity gradient correlations in isotropic turbulence
	Fang L; Bos WJT; Jin GD(晋国栋)
发表期刊	Physics of Fluids
	2015-12-09
卷号	27 期号:12 页码:125102
摘要	We show by direct numerical simulation (DNS) that the Lagrangian cross correlation of velocity gradients in homogeneous isotropic turbulence increases at short times, whereas its auto-correlation decreases. Kinematic considerations allow to show that two invariants of the turbulent velocity field determine the short-time velocity gradient correlations. In order to get a more intuitive understanding of the dynamics for longer times, heuristic models are proposed involving the combined action of local shear and rotation. These models quantitatively reproduce the effects and disentangle the different physical mechanisms leading to the observations in the DNS.
DOI	10.1063/1.4936140
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000367459300026
课题组名称	LNM湍流
论文分区	一类/力学重要期刊
引用统计	被引频次：16[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/58215
专题	非线性力学国家重点实验室
推荐引用方式 GB/T 7714	Fang L,Bos WJT,Jin GD. Short-time evolution of Lagrangian velocity gradient correlations in isotropic turbulence[J]. Physics of Fluids,2015,27,12,:125102.
APA	Fang L,Bos WJT,&Jin GD.(2015).Short-time evolution of Lagrangian velocity gradient correlations in isotropic turbulence.Physics of Fluids,27(12),125102.
MLA	Fang L,et al."Short-time evolution of Lagrangian velocity gradient correlations in isotropic turbulence".Physics of Fluids 27.12(2015):125102.

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