Method for computing turbulent flow using a near-wall...

Data processing: structural design – modeling – simulation – and em – Modeling by mathematical expression

Reexamination Certificate

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C703S007000, C703S009000

Reexamination Certificate

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07668705

ABSTRACT:
A technique that improves large-eddy simulation consists in replacing the instantaneous sub-grid scale eddy-viscosity (such as the dynamic Smagorinsky model eddy-viscosity) in the near-wall region with an eddy-viscosity computed from Reynolds Averaged Navier-Stokes eddy-viscosity and corrected dynamically using the resolved turbulent stress. The near-wall eddy-viscosity formulation is applied either with a wall stress model on coarse grids that do not resolve the wall or with wall-resolved grids coarsened in the wall-parallel directions. Reynolds averaged Navier-Stokes eddy-viscosity is computed either from a look-up table or from a simultaneous solution of a Reynolds Averaged Navier-Stokes turbulence model.

REFERENCES:
patent: 2003/0040894 (2003-02-01), Miyori et al.
patent: 2005/0107995 (2005-05-01), Inagaki
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J. S. Baggett, J. Jimenez, A. G. Kravchenko, “Resolution requirements in large-eddy simulations of shear flows”, 1997, Center for Turbulence Research Annual Research Briefs, pp. 51-66.
G. Kalitzin, G. Medic, G. Iaccarino, P. Durbin, “Near-wall behavior of RANS turbulence models and implications for wall functions”, Nov. 2004, Elsevier, Journal of Computational Physics 204, pp. 265-291.
J. U. Schluter, “Integration of RANS and LES Flow Solvers for Simultaneous Flow Computations”, Jan. 2003, American Institute of Aeronautics and Astronautics, AIAA 2003-0085, pp. 1-8.
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