I am trying to simulate an erosion chamber machine, this device include a water flow that I simulated with other software and I exported the resulting fields. In this case, I want to get erosion results from the combined analysis CFD-DEM, and I need enough accuracy for the erosion in the sample (flat disc). The main question here is, ¿Does the mesh of the disc matter? because I need accuracy, but I don't know if a complete volume mesh is required or if I can refine the surface mesh and let a rough volume mesh.