Standard CFD recommendations for mesh generation are also applied to DEM-CFD coupling cases using the one-way coupling approach. For example, to avoid poor-quality cells and large variations in adjacent cell volumes, apply denser meshes in zones with strong quantity gradients, and so on.

In the one-way coupling approach, it is assumed that the particles do not affect the flow field, as there is no information transfer from Rocky into the CFD solution. Because of this, there are no additional recommendations nor limitations imposed in the CFD simulation by the coupling scheme itself. Therefore, it is important that the user focus on providing the best CFD simulation possible.

It is important to highlight that the mesh size has an impact on the simulation cost, since the finer the mesh, the bigger the number of cells Rocky will search in order to find particles on which to perform calculations. This search process is done in order to obtain local pressure, fluid velocity, and temperature for forces and heat exchanges with the particle.