Question #696515 on Yade changed:
https://answers.launchpad.net/yade/+question/696515
Status: Open => Answered
Jan Stránský proposed the following answer:
Hello,
Ig2 is only one component in the interaction creation chain. Ig2_ Sphere_
Sphere_ ScGeom.interactionDetectionFactor "just" considers also "distant
interactions".
The [1] check would return false (= no interaction) for the case of no overlap,
but it does the computation and returns true (= interaction for further
consideration) for interactionDetectionFactor>1.
It computes penetrationDepth [2] as
Real norm = normal.norm(); // distance of sphere centers
Real penetrationDepth = s1->radius + s2->radius - norm;
so for "distant interactions" i.geom.penetrationDepth is negative.
Then, also Ip2 and Law2 are evaluated.
E.g. for "classical" Law2_ScGeom_FrictPhys_CundallStrack, the interaction is
deleted for the case of negative penetrationDepth [3] (i.e. "the Law2 functor
in use permitting" in [4]).
cheers
Jan
[2]
https://gitlab.com/yade-dev/trunk/-/blob/master/pkg/dem/Ig2_Sphere_Sphere_ScGeom.cpp#L51
[3]
https://gitlab.com/yade-dev/trunk/-/blob/master/pkg/dem/ElasticContactLaw.cpp#L62
[4] https://yade-dem.org/doc/user.html#creating-interactions
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