On the role of subgrid-scale coherent modes in large-eddy simulation

被引：24
|
作者：
De Stefano, G
Goldstein, DE
Vasilyev, OV [1 ]
机构：
[1] Univ Naples 2, Dipartimento Ingn Aerosp & Meccan, I-81031 Aversa, Italy
[2] Univ Colorado, Dept Mech Engn, Boulder, CO 80309 USA
来源：
JOURNAL OF FLUID MECHANICS | 2005年 / 525卷
关键词：
D O I：
10.1017/S002211200400254X
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
The role of coherent and incoherent subgrid-scale modes in large-eddy simulation modelling is examined. The coherent/incoherent decomposition of the subgrid-scale stresses based on the wavelet de-noising procedure is introduced. A priori dynamical tests based on the perfect modelling approach are performed for decaying isotropic turbulence. The theoretical effects of coherent and incoherent subgrid-scale forces are dynamically evaluated during the simulation. The relation between deterministic/stochastic subgrid-scale models and coherent/incoherent subgrid-scale stresses is discussed. The main result is that in large-eddy simulations low-order statistics can be almost exactly reproduced when only the effect of the coherent subgrid-scale modes is accounted for, while the incoherent subgrid-scale modes have a negligible effect upon the large-scale dynamics and the energy transfer.
引用
收藏
页码：263 / 274
页数：12
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