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Non-uniform sediment crash

  • June 3, 2026
  • mopperma

Hello everyone,

I am trying to run a non-uniform sediment simulation which always crashes when bed deformation is set to start.
I tried setting the bedload layer and mixing layer to d50 and 2dmax while reducing timestep but no configuration I tried seems to work.

I am sure the crash is related to non-uniform parameters since a uniform sediment distribution does not induce crashing.

Any idea on why this is ?

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  1. mopperma says:

    Actually found the cause of the problem. The sediment curve can’t start with a zeo mm class, this must cause numerical instabilities.

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