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[Chiara Modenese <question156756@xxxxxxxxxxxxxxxxxxxxx>]

Question #156756 on Yade changed:
https://answers.launchpad.net/yade/+question/156756

Chiara Modenese proposed the following answer:
VdW forces can also have an influence on the contact law itself. There are
different formulations around which consider the interplay between repulsive
and attractive forces at the contact. In physics, this interplay exists and
would change the contact stress distribution even. As I said, think first
about the assumptions you want to make. If you will like to consider the
superposition of adhesion to repulsive forces, then Bruno's suggestion can
work well. Otherwise, you should modify your contact law, I believe.

Chiara


On 9 May 2011 16:11, Chareyre <question156756@xxxxxxxxxxxxxxxxxxxxx> wrote:

> Question #156756 on Yade changed:
> https://answers.launchpad.net/yade/+question/156756
>
> Chareyre proposed the following answer:
> Hi Mark,
>
> VdW forces are not implemented but I see no big obstacle to implement them.
> It is close to the capillary force problem
> (https://yade-dem.org/wiki/CapillaryTriaxialTest) in the sense that you
> have additional forces that act between distant grains.
> I recommend doing that in a separate engine, so that VdW forces will not
> depend on a specific contact law (then you can switch between all
> existing contact laws, linear or non-linear elasticity, contact moments,
> etc.)
>
> Bruno
>
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