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[Luc Scholtès <question685323@xxxxxxxxxxxxxxxxxxxxx>]

Question #685323 on Yade changed:
https://answers.launchpad.net/yade/+question/685323

Luc Scholtès proposed the following answer:
Hi Panos,

Jerome is right about how to define the material when appending your
walls.

Also, keep in mind that friction between different bodies is, by
default, governed by the lowest friction angles of these 2 bodies (the
interaction law is formulated such as:
interactionFrictionAngle=min(FrictionAngleOfBody1,
FrictionAngleOfBody2)). This means that you can set the spheres to wall
friction angle between 0 and the sphere friction angle (30 in your
example), but not above.

A way to simulate "extreme" friction between the wall and the spheres
would be to block some Degrees Of Freedom of the spheres in contact with
the wall to avoid their tangential displacement (e.g., blocking X and Y
components of the spheres if the wall moves along Z).

Luc

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