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["Alexander Eulitz \[Eugen\]" <question247006@xxxxxxxxxxxxxxxxxxxxx>]

Question #247006 on Yade changed:
https://answers.launchpad.net/yade/+question/247006

Alexander Eulitz [Eugen] posted a new comment:
@Jan: "Anyway I think it should be possible to construct your clump from facets
and then assign proper mass and inertia to it" From some studies of sphere drop simulations I'd like to note that contact force calculation at "edges" (interactin of facets) is not correct, at least in the case of a contacting sphere [1]. We had a discussion on that some time ago. In the current facet implementation edges are not defined. That is why at the intersection of multiple facets sitffness is too high (sum of the stiffnesses of all intersecting facets if I recall correctly).
As a consequence there will be an increasing error in contact forces with increasing number of facet-intersections. Imagine a sphere approximated by facets. If you use lets say 48 instead of 12 facets for approximation of the sphere you will have way more intersections of facets (edges).

behzad: "It is supposed to be a bulk material ans so will need bonds between the spheres."
why do you need bonds between spheres for bulk material? What kind of material is it? If you consider a packing of spheres that is deposited by gravity there don't need to be bonds.

[1] https://answers.launchpad.net/yade/+question/229901

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