Question #694208 on Yade changed:
https://answers.launchpad.net/yade/+question/694208
Status: Answered => Open
ytang is still having a problem:
Hi Jan,
here is my understanding of your answer. if it isn't right, please correct me.
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If a sphere contact with two facets in the edge, the repulsive force will be
two times.
For example, if the sphere contact with one facet (not in the edge), the
repulsive force is 1N. The repulsive force for the sphere contact with two
facets in the edge will be 2N (if we consider the sphere-facet contact force is
the same for these two cases).
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If I set 1000 segments for the cone, the repulsive force at the tip of the cone
will be 100 times larger than that of the cone with 10 segments. (maybe not 100
times, but the repulsive force will be much higher than the cone with 10
segments)
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If this is the case, how can we get the real penetration resistance when the
penetrator penetrates into the sample?
I mean, different segment number has different penetration resistance.
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> You can try to debug the problem (e.g. printing forces on the "tip" sphere
> and comparing with expectation, trying (much) lower timestepSafetyCoefficient
> etc.)
As for the time step, I will try to decrease the parameter.
###############################################
> Consider using PFacets instead.
As for the PFacets, does this will solve the sphere-edges/sphere-vertices
contact problem?
or what is the effect of using PFacets? can you explain more about this?
best,
ytang
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