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[Chiara Modenese <question136034@xxxxxxxxxxxxxxxxxxxxx>]

Question #136034 on Yade changed:
https://answers.launchpad.net/yade/+question/136034

    Status: Answered => Open

Chiara Modenese is still having a problem:
Hi all! Thanks for your answers! I see that the unbalanced force is the best
indicator. Another matter is how to calibrate the algorithm's parameters to
achieve quasi-static equilibrium. I am used to scale up the mass, but when I
employ high inter-particle stiffnesses, then the system is quite unstable
and reducing the time step does not help. There are so many parameters
involved, like mass, loading rate, damping and so on. I could not find a
good paper where they suggest a "precise" way of calibration to reach
quasi-static equilibrium. For instance, can we use a smaller sample to
calibrate those parameters? Would be the calibration still representative?

cheers! Chiara

On 30 November 2010 11:30, Chareyre
<question136034@xxxxxxxxxxxxxxxxxxxxx>wrote:

> Question #136034 on Yade changed:
> https://answers.launchpad.net/yade/+question/136034
>
>    Status: Open => Answered
>
> Chareyre proposed the following answer:
> Hi Chiara,
>
> Not the only one, but unbalanced force is the best solution to my
> knowledge, since it really evaluate out-of-staticity forces in a
> non-dimensional form.
> I always used that in papers and never got a comment.
> I've seen disadvantages in all other indicator proposed (except variants
> of unbalanced force, like fb_max/fc_mean - you can get this one with a
> flag).
>
> Bruno
>
> Le 30/11/2010 10:40, Chiara Modenese a écrit :
> > New question #136034 on Yade:
> > https://answers.launchpad.net/yade/+question/136034
> >
> > Hello,
> >
> > I would like to address you a question about static-equilibrium in dem
> simulations, with particular reference to PeriTriaxController engine. In the
> latter, how do we make sure that the static-equilibrium condition is
> maintained during the triaxial phase, for instance? Looking at the code, I
> see that the unbalanced force is checked only when the system has reached
> the prescribed goal condition. What is the best criterion to establish if
> the system is under quasi-static conditions? Is the unbalanced force the
> only solution?
> >
> > Thank you for your opinion.
> > cheers, Chiara
> >
> >
> >
> >
> > Ce message entrant est certifie sans virus connu.
> > Analyse effectuee par AVG - www.avg.fr
> > Version: 9.0.872 / Base de donnees virale: 271.1.1/3288 - Date: 11/29/10
> 20:34:00
> >
>
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