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A dynamic VMS-LES model and its hybrid extension for bluff body flows

Journal article published in 2012 by C. Moussaed, S. Wornom, B. Koobus, M. V. Salvetti ORCID, A. Dervieux
This paper is available in a repository.
This paper is available in a repository.

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Postprint: policy unknown
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Abstract

A variational multiscale large-eddy simulation (VMS-LES) approach with dynamic subgrid scale (SGS) models and its hybrid extension are evaluated on the prediction of the flow around a circular cylinder at subcritical and supercritical flow regimes respectively. The spatial discretization is based on a mixed finite element/finite volume formulation on unstructured grids. In the VMS approach used in this work, the separation between the largest and the smallest resolved scales is obtained through a variational projection operator and a finite volume cell agglomeration. The dynamic version of Smagorinsky and WALE SGS models are used to account for the effects of the unresolved scales; in the VMS approach, it is only added to the smallest resolved scales. The capability of the proposed dynamic VMS-LES approach to accurately predict the aerodynamic forces acting on a circular cylinder is investigated for a Reynolds number set to 20,000. The same VMS-LES approach blended with a RANS model in a hybrid formulation is applied to the simulation around the same geometry at a Reynolds number of 1 million. It is shown that rather coarse meshes allow the accurate prediction of important bulk quantities to be obtained.