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[Vincent Richefeu <richefeu@xxxxxxxxx>]

> Vincent Richefeu ?????:

I suppose this means that you would like to learn about me (?)
So briefly, I'm French and I work in the laboratory 3S-R since a few  
months.
My PhD is about unsaturated granular materials simulated by DEM.
You can find more with google if you want...

> > Hi,
> >
> > Does anyone can give me a reference about the equations used in
> > Shop::getViscoelasticFromSpheresInteraction?
> You can get all formulas from
> http://dl.getdropbox.com/u/714488/viscoelastic_en.pdf
> or see a base article
> L. Pournin, Th. M. Liebling, and A. Mocellin. Molecular-dynamics force
> models for better control of energy dissipation in numerical  
> simulations of
> dense granular media. Phys. Rev. E, 65:011302, 2001.

Thanks a lot. Now, I understand a bit more...
The implanted law is for sphere-sphere contacts.
I suggest something (tell me your opinion please): what about  
computing cn and cs for each contact as a function of the  
corresponding effective mass?
In this way, the parameters would be kn,en,ks, and es.

Thanks again for reactivity,
Vincent Richefeu