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[Chiara Modenese <question158839@xxxxxxxxxxxxxxxxxxxxx>]

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

Chiara Modenese gave more information on the question:
On 24 May 2011 17:15, Chareyre <question158839@xxxxxxxxxxxxxxxxxxxxx>
wrote:

> Your question #158839 on Yade changed:
> https://answers.launchpad.net/yade/+question/158839
>
> Chareyre proposed the following answer:
> It's a bit like for globalStiffness time-stepper.
> The algorithm uses stiffness of contacts, so it matters if the law is
> linear or not.
> For HM, the engine should work correctly if it can get relevant tangent
> (i.e. dFn/dUn for current Fn) stiffnesses of each boundary-particle
> contacts.
> Is that possible with current implementation of HM? What is the meaning
> of i->phys->kn?
>
Yes, kn (and also ks) is computed as the current value of normal contact
stiffness (tangential value).


> If it is a bit unstable, playing with servo-damping could help
>
It is not very clear to me whether playing means increasing or decreasing
such a value. What about the coefficient 0.8 in the formula?

Chiara

> (
> https://yade-dem.org/doc/yade.wrapper.html?highlight=triaxial#yade.wrapper.TriaxialStressController.wallDamping
> ).
>
> Bruno
>
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