If you are working on pure DEM, my understanding is that you only need to set those parameters (fraction, restitution …with wall) in the Solids dialog. The solid wall boundary type in the BC dialog (no matter what you choose no-slip, free slip, partial slip) will not have any effect. You only need to let the code know that there is a wall. The boundary type (no-slip, free slip or partial slip wall) are required for fluid phase (or fluid-like solid phases), actually should be combined into “wall” when pure DEM is activated.
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