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

Christian Jakob posted a new comment:
@chiara

i searched for "timestep" in PFC manual. i really could not find
anything referred to viscous contact damping and timestep determination.
it is clear to me, that timesteps should be a bit smaller in that case,
but not with factor 100! what i can imagine is, that some code details
are not explained in the manual...

i tested a script without viscous damping and the timestep is still small 
compared to PFC timestep.
i also tested a script without any walls or facets, but it has no effect on 
timesteps.

as mentioned above, i will try to reactivate the "old" test script with
two colliding spheres and come back with the news.

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