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[Bruno Chareyre <question403713@xxxxxxxxxxxxxxxxxxxxx>]

Question #403713 on Yade changed:
https://answers.launchpad.net/yade/+question/403713

Bruno Chareyre proposed the following answer:
Newton::damping should not be used at all if you are interested in granular flow (that is, not just quasistatic evolutions).
hence no need to think about it.

As for viscous damping not mimicing "some" physical behavior, it surely fails to describe an inelastic shock between brittle objects (for instance).
The question here is not about viscous damping in itself but more about which material you are actually trying to simulate. It is usually a bit awkward to comment on decisions in DEM modeling without a prior knowledge of the real material properties. 

Bruno

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