The study “Assessment of LES modeling with a high order Discontinuous Galerkin solver” will be presented at the session “LES Methods & Applications 3”
This study is concerned with the ability of a flow solver using a high-order discontinuous Galerkin method (DGM) to perform large eddy simulation (LES) of turbulent flows. Several modeling approach are considered: the Smagorinsky model (Smag), the regularized variational multiscale model (RVMs) and the implicit LES (ILES). Results on decaying homogeneous isotropic turbulence (HIT) at Reλ=136 show that ILES already provides the correct amount of dissipation to damp the small scales of the system without altering the large ones. As a consequence, for the investigated cases the use of a subgrid scale (SGS) model with a DGM degrades the results compared to ILES. The approach is further validated on HIT at very high Reynolds number. In this case also, the results of ILES are in agreement with theory: energy spectra with an inertial range, following a k-5/3 behavior, are obtained. Finally, the method is validated on a turbulent channel flow at Reτ=395. The results are in good agreement with the reference direct numerical simulation (DNS) of Moser et al. In this case, it is shown that the error level is even slightly lower than those obtained with state-of-the-art SGS models.