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[Jan Stránský <question694208@xxxxxxxxxxxxxxxxxxxxx>]

Question #694208 on Yade changed:
https://answers.launchpad.net/yade/+question/694208

    Status: Open => Answered

Jan Stránský proposed the following answer:
Hello,

> I think the particles blowing up may result from the time step.

looks like this.
If a sphere interacts with multiple facets, the add force to it independently.
In the case of edges, the resulting repulsive force is two times what should be (sum force from two facets).
Even worse are vertices, the worst is the tip of cylinder, where there are not two but 50 facets and the force is 50 time what should be.
Essentially it is like the cone tip has 50x higher stiffness, resulting in the "time step problem" not considering this phenomenon.

Consider using PFacets instead.

You can try to debug the problem (e.g. printing forces on the "tip"
sphere and comparing with expectation, trying (much) lower
timestepSafetyCoefficient etc.)

cheers
Jan

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