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[Chareyre <question175394@xxxxxxxxxxxxxxxxxxxxx>]

Question #175394 on Yade changed:
https://answers.launchpad.net/yade/+question/175394

Chareyre posted a new comment:
>From your tables, I conclude that force-displacement realtions are
relatively similar (although not exactly equal). It can't explain a
factor 100 in dt, provided there is no parameter mismatch introduced in
the other scripts (are mass the same in ?).

Another thing is the tangential stiffness, that can also give
instabilities. To eliminate this cause, it is enough to set friction=0
and see if it stabilizes the problem.

I don't think the dt problem is connected to viscosity or radii multiplication.
What I'm wondering is if Yade is stable in the simple case of a bouncing sphere (https://www.yade-dem.org/doc/tutorial-examples.html), for the same time-step as PFC. This is a good test: no facets, no change of radii, no viscosity, no shear force, similar force-displacement relations on the normal. If we need different timesteps in this situation, it really narrows down the possible location of the bug.

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