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[Chiara Modenese <question158839@xxxxxxxxxxxxxxxxxxxxx>]

Question #158839 on Yade changed:
https://answers.launchpad.net/yade/+question/158839

    Status: Answered => Open

Chiara Modenese is still having a problem:
Hi Jerome,

thanks for answering. I also use to update contact stiffness. As I said, the
problem occurs at low cell pressures, say 1kPa or so. It has also to be said
that this is combined with high stiffness values which make time step
already very tiny. Am not really sure what could trigger oscillations in
such a case or if there is any solution other than going for lower
stiffnesses or higher pressures likewise.

Chiara


On 24 May 2011 16:11, jduriez <question158839@xxxxxxxxxxxxxxxxxxxxx> wrote:

> Your question #158839 on Yade changed:
> https://answers.launchpad.net/yade/+question/158839
>
>     Status: Open => Answered
>
> jduriez proposed the following answer:
> Hi Chiara,
>
> I used this kind of algorithm in my simulations with non linear contac
> relationships : to maintain a contact normal stress on a box, while contact
> law was "bilinear" (kn(loading) = cst # kn(unloading) = cst ). Probably
> different from your case, but for me it worked.
> I paid attention to use the right stifness in the algorithm, using
> kn(loading) if my box goes into the sample, and the contrary otherwise.
>
> You could maybe use an updated stifness value in your case (with
> derivative ?) ??? if the changes of stifness during interpenetration is
> really the problem
>
> Not Bruno (sorry ;-) )
>
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