Energy transfers and spectral eddy viscosity in large-eddy simulations of homogeneous isotropic turbulence: Comparison of dynamic Smagorinsky and multiscale models over a range of discretizations

被引：34
作者：
Hughes, TJR
Wells, GN
Wray, AA
机构：
[1] Univ Texas, Austin, TX 78735 USA
[2] Delft Univ Technol, Fac Civil Engn & Geosci, NL-2628 CN Delft, Netherlands
[3] NASA, Ames Res Ctr, Moffett Field, CA 94035 USA
来源：
PHYSICS OF FLUIDS | 2004年 / 16卷 / 11期
关键词：
D O I：
10.1063/1.1789157
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
Energy transfers within large-eddy simulation (LES) and direct numerical simulation (DNS) grids are studied. The spectral eddy viscosity for conventional dynamic Smagorinsky and variational multiscale LES methods are compared with DNS results. Both models underestimate the DNS results for a very coarse LES, but the dynamic Smagorinsky model is significantly better. For moderately to well-refined LES, the dynamic Smagorinsky model overestimates the spectral eddy viscosity at low wave numbers. The multiscale model is in good agreement with DNS for these cases. The convergence of the multiscale model to the DNS with grid refinement is more rapid than for the dynamic Smagorinsky model. (C) 2004 American Institute of Physics.
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收藏
页码：4044 / 4052
页数：9
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