A dynamic subgrid-scale eddy viscosity model (original) (raw)
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Abstract
One major drawback of the eddy viscosity subgrid-scale stress models used in large-eddy simulations is their inability to represent correctly with a single universal constant different turbulent fields in rotating or sheared flows, near solid walls, or in transitional regimes. In the present work a new eddy viscosity model is presented which alleviates many of these drawbacks. The model coefficient is computed dynamically as the calculation progresses rather than input a priori. The model is based on an algebraic identity between the subgrid-scale stresses at two different filtered levels and the resolved turbulent stresses. The subgrid-scale stresses obtained using the proposed model vanish in laminar flow and at a solid boundary, and have the correct asymptotic behavior in the near-wall region of a turbulent boundary layer. The results of large-eddy simulations of transitional and turbulent channel flow that use the proposed model are in good agreement with the direct simulation data.
Publication:
Physics of Fluids A
Pub Date:
July 1991
DOI:
Bibcode:
Keywords:
- Computational Fluid Dynamics;
- Computational Grids;
- Eddy Viscosity;
- Mathematical Models;
- Rotating Fluids;
- Turbulent Flow;
- Wall Flow;
- Fluid Mechanics and Heat Transfer