Question #654914 on Yade changed:
https://answers.launchpad.net/yade/+question/654914

    Status: Open => Answered

Robert Caulk proposed the following answer:
Hello,

I imagine your simulation is not stable because you are using a timestep
> maxAllowable:

O.dt=2.1*utils.PWaveTimeStep()

You need to use a fraction of the PWave informed time step to maintain
stability [1]. Otherwise you are integrating blindly :-)

[1]https://yade-dem.org/doc/formulation.html#stability-considerations

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