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[Jérôme Duriez <question665675@xxxxxxxxxxxxxxxxxxxxx>]

Question #665675 on Yade changed:
https://answers.launchpad.net/yade/+question/665675

    Status: Open => Answered

Jérôme Duriez proposed the following answer:
Hi,

- with N_mesh = 1, the bottom of your box is still divided into two
facet bodies (with ids 10 and 11). Your sphere seems to be just in the
middle, and it turns out it will interact with both halves of this
bottom, ie the two facet bodies 10 and 11

Hence two interactions in this case (make your sphere fall " right in
the middle" of one facet body and you would get only one interaction)

- with N_mesh = 2, the bottom of your box is divided into even more
(smaller) facet bodies. There are 6 facet bodies that touch each other
at the middle point of the box bottom. The sphere will interact will all
of those.

Hence 6 interactions in this case

- playing with this number of bodies, forming the box bottom, then corresponds to simulating a sphere falling on a mattress made of 2, or 6, springs. 
Since the springs will maybe always have the same stiffness (? you have to check I'm not familiar with facet- interactions), this could explain the different dynamics (resultant force on the sphere and its position with time) you observe in your simulations

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