13th International Workshop on Variational Multiscale and Stabilized Finite Elemements (VMS 18) - Abstract
Schroeder, Philipp W.
In this talk we present numerical results for the computation of 3D turbulent incompressible flows -- the Taylor--Green vortex and the turbulent channel flow at various friction Reynolds numbers are considered. We focus on the case of highly under-resolved simulations and show that high-order DG methods are very well able to capture the essential flow features in an implicit LES setting. More precisely, the performance of an exactly divergence-free H(div)-(H)DG method is compared to a stabilised L2-DG method and some differences and similarities are highlighted. Furthermore, we discuss the concept of (implicit) dissipation mechanism in DG methods and call attention to possible ambiguities in what is frequently understood as “molecular dissipation”.