Wall model for large-eddy simulation based on the lattice Boltzmann method
An original wall-model for lattice Boltzmann based large-eddy simulation is presented. It relies on either an analytical profile for the velocity profile within the first off-wall cell or the solution of Turbulent Boundary Layer Equations. The latter are solved thanks to a meshless approach to obtain a user-friendly method. The proposed method is observed to be both robust and accurate, yielding very satisfactory results in plane channel flow up to Re?=20?000 Re ? = 20?000 on uniform grids with ?x+=?y+=?z+=1000 ? x + = ? y + = ? z + = 1000 . The computed maximum error on skin friction is about 4% in most investigated cases on the coarsest grids (10 grid points across the half-channel height). It lies within 12% on finer grids with 2060 uniformly distributed grid points in the channel half-height.
wall modeling large-eddy simulation lattice boltzmann method boundary layer subgrid modeling turbulent plane channel