期刊
COMPUTERS & FLUIDS
卷 39, 期 7, 页码 1083-1094出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.compfluid.2010.01.017
关键词
Large-eddy simulation; Variational multiscale approach; Unstructured grids; Circular cylinder flow
资金
- CINECA (Italy)
- IDRIS (France)
- CINES (France)
The effects of numerical viscosity, subgrid scale (SGS) viscosity and grid resolution are investigated in LES and VMS-LES simulations of the flow around a circular cylinder at Re = 3900 on unstructured grids. The separation between the largest and the smallest resolved scales in the VMS formulation is obtained through a variational projection operator and finite-volume cell agglomeration. Three different non-dynamic eddy-viscosity SGS models are used both in classical and in VMS-LES. The so-called small-small formulation is used in VMS-LES, i.e the SGS viscosity is computed as a function of the smallest resolved scales Two different grid resolutions are considered It is found that, for each considered SGS model, the amount of SGS viscosity introduced in the VMS-LES formulation is significantly lower than in classical LES This, together with the fact that in the VMS formulation the SGS viscosity only acts on the smallest resolved scales, has a strong impact on the results However, a significant sensitivity of the results to the considered SGS model remains also in the VMS-LES formulation Moreover, passing from classical LES to VMS-LES does not systematically lead to an improvement of the quality of the numerical predictions. (C) 2010 Elsevier Ltd. All rights reserved.
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