A polyhedral mesh is applied with a base cell size of dp /10 and a refinement of dp /20 in the wake and dp /100 at the particle surface. Layers of prismatic cells are created at both sides of the particle surface as suggested by . According to , the total thickness of the prism layers in the fluid domain are set to the thickness of the momentum boundary layer δ m in the stagnation point of a sphere at the highest investigated Re p , which was derived by .