I'm not aware of DDPM tutorials for accumulation, the model will try and revert to the granular phase model, rather than build up. Hence suggesting Rocky if there is a lot of deposition.Â
The floating point could mean your time step is too high, but may also be linked to the way DDPM tries to maintain the volume fraction. Free falling particles are always problematic when released from rest as the next release invariably overlaps the previous particles whilst the time step is linked to the fastest moving part of the domain.Â
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