Question #693446 on Yade changed:
https://answers.launchpad.net/yade/+question/693446
Status: Open => Answered
Bruno Chareyre proposed the following answer:
Hi,
I have noticed those violent vibrations sometimes and I'm still not sure if it
is a bug somewhere or just expected instability due to timestep issues.
Anyway, chainedCylinders are deprecated and will probably not interact properly
with PFacets. You should use PFacets for both the object and the brush (PFacets
include cylinders as a special case).
On viscosity: whether it is a bug or a legit numerical instability
viscosity will probably not help in solving it. It can make it only
worse. If you still want viscosity (because the real brush has some)
you'll have to dive and implement it. As you found out creep is really
creep: an irreversible Maxwell-kindof viscoplastic process.
I hope it helps.
Bruno
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