High Reynolds Number Large-Eddy Simulation of Free Shear Flows

摘要

Theoretical and numerical aspects of Large Eddy Simulation (LES) and Monotonically Integrated LES (MILES) are discussed in terms of the modified equations and quantified by comparing databases of homogeneous turbulence and transitional free jets. The MILES SGS models are found to be of tensorial eddy-viscosity. LES appears virtually independent of the SGS model if the resolution is fine enough to ensure that the cut-off wavenumber lies in the inertial sub-range, provided that the SGS model can adequately channel kinetic energy out of the wavenumbers close to the cut-off wavenumber to prevent aliasing.