Large-Eddy Simulation of Turbulent Channel Flow

Abstract

In order to be of use in engineering situations, LES models must be able to reproduce near-wall flows. We approach this by refining the mesh close to the wall in a manner that reflects the anisotropic nature of nearwall turbulence. This requires the SGS modelling to be able to deal with anisotropic meshes as well as the anisotropic turbulence near the walls. The technique is then applied to fully-developed turbulent flow in a channel. We show that the first and second order statistical moments of the resolvable velocity are well reproduced, with the differential stress model of Deardorff performing particularly well.