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[Chareyre <question207350@xxxxxxxxxxxxxxxxxxxxx>]

Question #207350 on Yade changed:
https://answers.launchpad.net/yade/+question/207350

Chareyre proposed the following answer:
Ok, uniform distribution don't compact very well by default since they have a small quantity of small particles.
You can however generate a uniform mass distribution which will reach higher solid fraction (see psd.py example script)

> 3. I think we use the same contact law: the same mechanical
> parameters(include the cohesion), the same way to calculate normal and
> tangential force,  normal and tangential contact stiffness, the same
> Mohr-Coulomb rupture criterion...., actually, the maximum differential
> stress  obtained by   Plassiard  is 400kpa, while in my situation, it is
> only 300kpa.

Didn't you include contact moments? If not, it would clearly explain the
difference.

If you included them, then note that the implementation of "rolling" are not exactly the same in Plassiard and in Yade. 
In Yade, it's only based on the relative rotation (in fact bending angle), while in Plassiard it is more complicated. 
It should be possible to find similar results with both implementations but maybe with different parameters.

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