Explicit High-Order Discontinuous Galerkin Spectral Element Methods for LES and DNS

摘要

In this work we apply the high-order discontinuous Galerkin spectral element method (DGSEM) with explicit Runge-Kutta time integration to a classical square duct channel flow problem, which is a widely used benchmark case for turbulent flows. We show that due to its good scale resolving capabilities and low dispersion and dissipation errors DGSEM is a suitable alternative to both finite difference and finite volume methods in the field of LES and DNS. We demonstrate the computational efficiency and parallel scalability of the scheme by performing both DNS and LES simulations of the channel flow at a Reynolds number of Re_τ - 395. We employ an implicit closure strategy for the subgrid fluxes in the LES setting and show that our results are on par with reference results from literature.