Surely, Rocky can simulate all kinds of shapes, sizes and numbers of particles (but large numbers of particles and very small particles result in long simulation times). Rocky can also simulate fluids using smoothed-particle hydrodynamics (SPH) and its interaction with particles and walls. ESSS, the company that developed Rocky have several tutorials on their support page (https://support.esss.co/). Hopefully, an Ansys employee can guide you here on the forum on how to access them.
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