yade-dev team mailing list archive

[Chiara Modenese <c.modenese@xxxxxxxxx>]

@Vincent: Grazie!

@Sergei: I want to know about that for completeness since am using viscous
damping and also because in the future I will probably be using clumps too
and I understood that (maybe) there could be an issue about the time step of
the numerical scheme.

Chiara


On 24 February 2011 15:21, Vincent Richefeu <richefeu@xxxxxxxxxxxxxxx>wrote:

> Just a pdf file I found on the web:
> http://www.m-hikari.com/ces/ces2009/ces1-4-2009/teufelsbauerCES1-4-2009.pdf
> Maybe it helps !?
> Ciao
> Vincent
>
> Le 23 févr. 2011 à 19:01, Chiara Modenese a écrit :
>
> > Hi Bruno and Vincent,
> >
> > thanks for your answers.
> >
> > I have PFC manual on my desk (though I never directly used that code) and
> they do define also contact viscous damping. In order to modify the time
> step to account for damping effects, they re-define the tangential and
> normal stiffness such that their values are increased by some factors.
> Hence, the critical time step for viscous contacts should result be smaller
> than the one for non-viscous contacts (do you agree?). I could not find out
> where the PFC formulas come from, that is why I asked to you about that so
> to have an alternative.
> >
> > I appreciate your help (Sergei, perhaps you have also been using viscous
> contacts, any ideas about the critical time step?).
> >
> > Chiara
>
>
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