yade-dev team mailing list archive

[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>]

> I am not as confident as you. Imagine spheres that do not overlap on a regular grid.
> If you impose a shear rate at constant volume (without gravity) by making the displacement of each sphere proportional to their height (the total height of the cell remain constant), I think that the spheres will never interact (!)
Why not?!

>  By imposing velocity proportional to the height, the displacement of each sphere will be different due to the different inertia. So, it seems not exactly equivalent in my opinion.
>
>   
If you impose velocity, how can displacement depend on inertia?

> An other point:
> Even if periodic boundary condition works fine for triaxial loadings, it seems to me that the framework offered by yade deserves more than "tinkering". Otherwise I do not understand the interest! For this reason, I think it would be interesting to look in more detail what Gael and I say about H, r and s...
> This is not something complicated and it is well-tested.
>   
I totally agree for looking at the details. Let us do that asap, on our 
side. My feeling is the two things are totally equivalent* (and 
generalization to shear should not be a problem either).
Perhaps I'm wrong, we will see. At least, we have something more 
homogeneous than before now.
We can always improve if it's not enough.

Bruno





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