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A mixed multiscale dynamic SGS model accounting for the cross-term

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Purely dissipative eddy-viscosity subgrid-scales (SGS) stress models are broadly used in large eddy simulations (LES) of turbulent flows. The actual SGS behavior is however locally not purely dissipative. In this sense, more advanced models are desirable.
Such a model is presented hereafter and is tested in decaying homogeneous isotropic turbulence (HIT). We propose a dynamic mixed model that accounts for both the Reynolds term and the cross-term of the SGS stress tensor. The model is shown to behave in good agreement with the reference DNS.

Author(s):

Olivier Thiry    
Institute of Mechanics, Materials and Civil Engineering, Université catholique de Louvain, 1348 Louvain-la-Neuve
Belgium

Grégoire Winckelmans    
Institute of Mechanics, Materials and Civil Engineering, Université catholique de Louvain, 1348 Louvain-la-Neuve
Belgium