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

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	Short-time evolution of Lagrangian velocity gradient correlations in isotropic turbulence
	Fang L; Bos WJT; Jin GD(晋国栋)
刊名	Physics of Fluids
	2015-12-09
卷号	27 期号:12 页码:125102
中文摘要	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.
分类号	一类/力学重要期刊
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000367459300026
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/58215]
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	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.