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
--
_______________
Chareyre Bruno
Maître de Conférences
Grenoble INP
Laboratoire 3SR - bureau E145
BP 53 - 38041, Grenoble cedex 9 - France
Tél : 33 4 56 52 86 21
Fax : 33 4 76 82 70 43
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