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Short-time evolution of Lagrangian velocity gradient correlations in isotropic turbulence
Fang L; Bos WJT; Jin GD(晋国栋)
Source PublicationPhysics of Fluids
2015-12-09
Volume27Issue:12Pages:125102
AbstractWe 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.
DOI10.1063/1.4936140
Indexed BySCI ; EI
Language英语
WOS IDWOS:000367459300026
DepartmentLNM湍流
Classification一类/力学重要期刊
Citation statistics
Cited Times:15[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/58215
Collection非线性力学国家重点实验室
Recommended Citation
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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