A wall-layer model is proposed for large eddy simulation of high Reynolds number turbulent flows in conjunction with immersed boundaries. The model is based on two main steps: the reconstruction of the velocity field at the first grid point off the immersed body and the modelization of the actual wall shear stress at the immersed boundary through imposition of a Reynolds averaged Navier–Stokes-like eddy viscosity obtained by means of analytical considerations. The model is tested in a turbulent plane channel flow with walls reproduced by immersed boundaries considering both Cartesian and curvilinear grids. Even with coarse and distorted grids the proposed methodology is able to reproduce accurately both first- and second-order turbulent statistics.

Topics
Velocity gradient tensor, Deformation, Interpolation, Computational fluid dynamics, Turbulence theory and modelling, Flow boundary effects, Navier Stokes equations, Turbulence simulations, Turbulent flows, Viscosity
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© 2009 American Institute of Physics.
2009
American Institute of Physics
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