Question #699705 on Yade changed:
https://answers.launchpad.net/yade/+question/699705
Status: Open => Answered
Jérôme Duriez proposed the following answer:
Generally speaking about
> how to distinguish between ball-to-ball contact and ball-to-wall
contact
assigning different FrictMat instance to spheres or walls will allow you
to have different contact properties in such pairs, depending on the Ip2
calculations. For instance Ip2_FrictMat_FrictMat_FrictPhys computes by
default contact friction angle as the minimum of both Material friction
angles.
You may have so-called MatchMaker to tune the behavior e.g. [*], but
these are (at the moment) not available for every contact attribute /
every Ip2.
This being said, your present Ip2 looks to be singular in the sense it has a
contact parameter directly as an Ip2 parameter, which is not the classical
design and a clear drawback for your workflow.
In this case, you have no other choice than manually looping over
interactions and change parameters as you see fit. Fortunately, the Ip2
works only once at interaction creation so you won't have to do the same
job twice for a given interaction (but it may still be painful because
you have to continuously monitor new interactions..... )
[*] https://yade-
dem.org/doc/yade.wrapper.html#yade.wrapper.Ip2_FrictMat_FrictMat_FrictPhys.kn
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