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[Chareyre <question269739@xxxxxxxxxxxxxxxxxxxxx>]

Question #269739 on Yade changed:
https://answers.launchpad.net/yade/+question/269739

Chareyre posted a new comment:
Unfortunately this is not really helpful in general. Having boundary-sphere
more stiff than sphere-sphere can only increase heterogeneity near the
boundaries, hence maximizing boundary effects that we usually want to
avoid. It is interesting
as an option, not better in general. A proper way to give the option
without changing the default would be great.
Bruno

On 4 August 2015 at 17:46, Bettina Suhr <
question269739@xxxxxxxxxxxxxxxxxxxxx> wrote:

> Question #269739 on Yade changed:
> https://answers.launchpad.net/yade/+question/269739
>
>     Status: Answered => Solved
>
> Bettina Suhr confirmed that the question is solved:
> Dear Bruno,
>
> thank you for you help. You are right, starting from the analytical
> solution for the contact of two spheres,
> the analytical solution for sphere-wall contact is obtained when one
> radius goes to infinity.
> What I found in the Yade source code is:
>
> sphere-facet (Ig2_Facet_Sphere_ScGeom):
> scm->radius1 = 2*sphereRadius;
> scm->radius2 = sphereRadius;
>
> sphere-wall contact (Ig2_Wall_Sphere_ScGeom):
> ws->radius1=ws->radius2=radius; // do the same as for facet-sphere: wall's
> "radius" is the same as the sphere's radius
>
> I changed in both function the radius of the wall to be big (1e8*radius
> of the sphere).
>
> After eliminating another error in my script (my wall had the same
> material parameters as the sphere, where the wall was supposed to be rigid),
> now I obtain the correct result for this test case.
>
> Is the choice of the radius of a facet/wall meaningful for other contact
> laws? Or should it be changed?
>
> Thanks again,
> Bettina
>
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