Question #258763 on Yade changed:
https://answers.launchpad.net/yade/+question/258763
Status: Open => Answered
Bruno Chareyre proposed the following answer:
You are facing a numercial instability. Updating the timestep every 100
iterations with a safety factor =0.8 is not enough at some point, then it
diverges.
Decrease the 100 or the 0.8, it will become stable.
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