Computational Comparison of DES and LES in Channel Flow Simulation

Abstract

As two computational fluid dynamics (CFD) simulation methods, detached-eddy simulation (DES) and large-eddy simulation (LES) are compared in a turbulent channel flow simulation at Reb=2800. The Navier—Stokes equations are solved with three different grid resolutions by using a co-located finite-volume method. Spalart-Allmaras model dynamic model and are implemented in DES and LES, accordingly. DES acts as a wall-modeling of LES and functions powerfully as a near-wall treatment for LES technique, though it failed to predict the near wall turbulent structure as expected. The results of LES with the finest mesh compared well with direct numerical simulation (DNS).