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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.
Source PublicationACTA MECHANICA SINICA
2012-08-01
Volume28Issue:4Pages:993-998
ISSN0567-7718
AbstractWe 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.
KeywordLarge-eddy Simulation Subgrid Scale Model Space-time Correlation Turbulent Shear Flows Large-eddy Simulation Channel Flow Backscatter Velocity Models Field
Subject Area湍流
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Indexed BySCI ; EI ; CSCD
Language英语
WOS IDWOS:000308542200009
Funding OrganizationThe 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).
DepartmentLNM湍流
Classification二类
Citation statistics
Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/46708
Collection非线性力学国家重点实验室
Corresponding AuthorHe, GW; Chinese Acad Sci, LNM, Inst Mech, Beijing 100190, Peoples R China.
Recommended Citation
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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