期刊
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
卷 195, 期 9-12, 页码 1154-1179出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cma.2005.04.009
关键词
stabilized finite element methods; variational multiscale closure; entropy variables; large-eddy simulation
The variational multiscale approach for large-eddy simulation is investigated within a finite element framework. A filtering analog of this method, providing a model, which shares basic structures with hyperviscosity models, is used and evaluated on a freely decaying isotropic turbulence in the limit of infinite Reynolds numbers. The method used is based on a symmetric form of the Navier-Stokes equations stabilized with a Galerkin/least-squares approach. The proposed procedure provides appealing results. It is as satisfactory as the use of Germano and Lilly's dynamic algorithm, without stabilization flaws, and at a lower cost. Comparisons between numerical dissipation and the proper subgrid closure show that the variational multiscale models tend to compute a turbulent viscosity that accounts for the numerical sources of dissipation, which reveals an important feature for an intensive and robust use of VMS-large-eddy simulation. (c) 2005 Elsevier B.V. All rights reserved.
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