Question #692146 on Yade changed:
https://answers.launchpad.net/yade/+question/692146
Status: Open => Answered
Jérôme Duriez proposed the following answer:
Hello,
The answer in C++ language is at [1].
In a maybe more human language, the interactions that carry the forces
entering the stress expression are assumed to have a geom [2] component
of GenericSpheresContact [3] (or child) type (if not, YADE would
probably crash)
As such, there necessarily is a reference radius assigned to each
interacting body, see refR* [4]. For wall or facets, the radius seems to
be chosen as once or twice the sphere's one [5], hence the volume.
How much sense this makes might be a next question ;-)
[*]
https://gitlab.com/yade-dev/trunk/-/blob/b87224b638ed162dd8865d097332286b4b2c9263/pkg/dem/Shop_02.cpp#L885,
most recent version as of now
[2] https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.Interaction.geom
[3]
https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.GenericSpheresContact
[4]
https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.GenericSpheresContact.refR1
and refR2
[5]
https://gitlab.com/yade-dev/trunk/-/blob/b87224b638ed162dd8865d097332286b4b2c9263/pkg/dem/Ig2_Facet_Sphere_ScGeom.cpp#L122
for Facet-Sphere and
https://gitlab.com/yade-dev/trunk/-/blob/b87224b638ed162dd8865d097332286b4b2c9263/pkg/dem/Ig2_Facet_Sphere_ScGeom.cpp#L220
for Wall-Sphere
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