LES prediction of space-time correlations in turbulent shear flows

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	LES prediction of space-time correlations in turbulent shear flows
	Guo L(郭力); Li D(李栋); Zhang X(张星); He GW(何国威); He, GW; Chinese Acad Sci, LNM, Inst Mech, Beijing 100190, Peoples R China.
发表期刊	ACTA MECHANICA SINICA
	2012-08-01
卷号	28 期号:4 页码:993-998
ISSN	0567-7718
摘要	We compare the space-time correlations calculated from direct numerical simulation (DNS) and large-eddy simulation (LES) of turbulent channel flows. It is found from the comparisons that the LES with an eddy-viscosity sub-grid scale (SGS) model over-predicts the space-time correlations than the DNS. The overpredictions are further quantified by the integral scales of directional correlations and convection velocities. A physical argument for the overprediction is provided that the eddy-viscosity SGS model alone does not includes the backscatter effects although it correctly represents the energy dissipations of SGS motions. This argument is confirmed by the recently developed elliptic model for space-time correlations in turbulent shear flows. It suggests that enstrophy is crucial to the LES prediction of space-time correlations. The random forcing models and stochastic SGS models are proposed to overcome the overpredictions on space-time correlations.
关键词	Large-eddy Simulation Subgrid Scale Model Space-time Correlation Turbulent Shear Flows Large-eddy Simulation Channel Flow Backscatter Velocity Models Field
学科领域	湍流
URL	查看原文
收录类别	SCI ; EI ; CSCD
语种	英语
WOS记录号	WOS:000308542200009
项目资助者	The project was supported by the National Basic Research Program of China (973 Program) (2007CB814800) and the National Natural Science Foundation of China (10325211 and 10628206).
课题组名称	LNM湍流
论文分区	二类
引用统计	被引频次：11[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/311007/46708
专题	非线性力学国家重点实验室
通讯作者	He, GW; Chinese Acad Sci, LNM, Inst Mech, Beijing 100190, Peoples R China.
推荐引用方式 GB/T 7714	Guo L,Li D,Zhang X,et al. LES prediction of space-time correlations in turbulent shear flows[J]. ACTA MECHANICA SINICA,2012,28,4,:993-998.
APA	Guo L,Li D,Zhang X,He GW,He, GW,&Chinese Acad Sci, LNM, Inst Mech, Beijing 100190, Peoples R China..(2012).LES prediction of space-time correlations in turbulent shear flows.ACTA MECHANICA SINICA,28(4),993-998.
MLA	Guo L,et al."LES prediction of space-time correlations in turbulent shear flows".ACTA MECHANICA SINICA 28.4(2012):993-998.

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