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Re: [Question #693446]: How to have viscous damping for chainedCylinder

To: yade-users@xxxxxxxxxxxxxxxxxxx
From: Bruno Chareyre <question693446@xxxxxxxxxxxxxxxxxxxxx>
Date: Wed, 14 Oct 2020 16:20:48 -0000
Reply-to: question693446@xxxxxxxxxxxxxxxxxxxxx
Sender: bounces@xxxxxxxxxxxxx

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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