yade-dev team mailing list archive

[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>]

> Where? In PeriTriaxController? Yes, but in the in-between steps, it is
> estimated from stiffness value (which is perhaps computed wrongly, but
> doesn't invalidate such approach by itself).
With _exact_ stiffness it would work only if all bodies in the cell were 
not dynamic, i.e. almost never.
When we use a "stiffness", we implicitly assume that the boundaries will 
move while the solid inside is fixed (in other words, we say the 
relative (boundary-body) displacement is equal to the displacement of 
the boundary, i.e. bodies are fixed).
This assumption is wrong even on one single step, but the algorithm works.
On more than one step, the chance that it will work tends to 0 I'm 
afraid... But don't move, I'm sending a new engine that will eventually 
replace PeriTriax.

Bruno

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