Applications of a Discontinuous Galerkin Chimera Method on 3D Flow Problems

Within the DGDES project a computational fluid dynamics (CFD) code has been developed using a discontinuous Galerkin (DG) method for the spatial discretization. The DG method is a high-order method in space reducing the amount of cells required for numerical simulations compared to traditional CFD solvers. The aim of the project is to investigate the potential of the DG method for the calculation of the flow phenomena at helicopter rotors. The present study concerns the implementation of a Chimera method and its application to 3D problems dealing with unsteady flows and moving geometries. The results for a test case of the flow past a sphere reveal promising results compared to the reference. Furthermore, a first application to a 3D rotor in hover and in forward fligth are presented. In addition, the parallel performance is investigated and shows the good scalability of the code on the HPE Apollo Hawk system installed at the High Performance Computing Center Stuttgart (HLRS).