Dne 19.3.2009 16:55, Kien Dang, Mr napsal(a):
Hi,
According to my understanding, the shrink factor in the paper is used to avoid
the sphere interact with more than one facet, it is; however, not effective and
it may cause unstability if shrink factor is too large and determine shrink
factor suitable for each simulation is somehow unrealistic. In my opinion, we
can remember the number of coincided contact points (in IF2IS4SC) for each
sphere, we can check the conincidence by some criterion
(contactpoint-contactpoint).Length() smaller than some value (can be tol*sphere
radius) and then in the constitutive law the force at the contact will be
divided by that number. By that way we can avoid complicated algorithms.
That would be much more complicated actually, since the functors
shouldn't access interaction containers. The topology information is
constant throughout the simulation and it makes not much sense to
determine it at every step. It would essentially add another collider to
the loop, which would take quite some time.
The shrinkFactor doesn't avoid multiple contacts, since there can always
be 1 sphere between both facets interacting with both edges.
Vaclav
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