Question #687174 on Yade changed:
https://answers.launchpad.net/yade/+question/687174
Status: Open => Answered
Jan Stránský proposed the following answer:
Sorry,
I have run your simulation (have not done it before) and now I see what you
have meant. The problem is not forces (as I understood from the OP), but
recorded "dz".
Disk[2].state.pos is "center" of a facet, which is rotating around disk center
and naturally "bouncing back" in one half of the rotation.
do
'dz': trans.velocity*O.dt # disk center, same as setting zeroPoint
instead
Also consider to do this change in the stop condition
cheers
Jan
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