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Re: [Question #181608]: Viscous damping of clumps

 

Question #181608 on Yade changed:
https://answers.launchpad.net/yade/+question/181608

    Status: Open => Answered

Chareyre proposed the following answer:
Klaus, your script gives:
NameError: name 'FrictViscoMat' is not defined

Changing to FrictMat (correct?), I see the clump going through the facet. Actually, spheres of the cump go through the plane then the contact is with the other side of the facet, it explain the bigger overlap.
It is not a bug IMO. DEM and/or clumps can't handle such big overlaps at contact. It is physicaly unrealistic anyway for geomaterials. 

In order to simulate such large deformation with the dem (like a tennis
ball impact), one would need to simulate the ball as a collection of
spheres with cohesive contacts, so that the ball itself would be
deformable. A clump is restricted to rigid blocks with SMALL deformation
near the contacts (the fundamental assumption in DEM).

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