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[Chareyre <question256283@xxxxxxxxxxxxxxxxxxxxx>]

Question #256283 on Yade changed:
https://answers.launchpad.net/yade/+question/256283

    Status: Open => Answered

Chareyre proposed the following answer:
Hi,

On 28/10/14 08:16, Alexander Smith wrote:
> I tested the Hertz Mindlin contact model and noticed that shear and normal viscous damping is not accounted for in a sphere-facet contact. It behaves correctly with a sphere-sphere contact. I have attached a simple script below to illustrate my point. I just wanted to check before I report a bug.
To me it sounds like a bug, but maybe it is intentional. Devs of the
viscous model will tell.

> Also, I noticed that a facet is made of two "triangles" and at the junction of the two it appears the sphere is in contact with both surfaces. This increases the normal force and effects shear force and contact moments (shown by setting a=0 in the script below). Is this correct?
No, it is not correct. It is a known issue of facet-sphere contacts, and
it is more or less solutionless in the context of facets as they are now.
Thus, I would not recommend to try and fix this by yourself.
Some solutions are being implemented and should be released soon. They
replace facets by more advanced shapes.

> I am developing a contact model and  I need some guidance on how to fix it to ensure that the contact model behaves correctly on flat surfaces.
If the surface is flat, then it can be a single facet, or a a box.
Problem solved (or?).

Bruno

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