Question #679050 on Yade changed:
https://answers.launchpad.net/yade/+question/679050
Status: Open => Answered
Fabio proposed the following answer:
Hi,
I don't check your code but I guess in some (rare) cases it could be a problem
related to the number of spheres you used, the bulk porosity, and their size in
comparison to the amplitude of HarmonicMotionEngine. Let suppose to use two
particles vertically aligned, and a plane at the base. The upper one is
displacement controlled. If you move the upper one with an amplitude exceeding
2*radius the particle at the bottom could pass through the plate (or the upper
sphere). The time step can be small but I suppose it doesn't matter.
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