yade-users team mailing list archive

[Chiara Modenese <question238696@xxxxxxxxxxxxxxxxxxxxx>]

Question #238696 on Yade changed:
https://answers.launchpad.net/yade/+question/238696

Chiara Modenese proposed the following answer:
Hi Lingran,

I have used contact damping with the HM law. Whether it is approprate in a
dynamic case like yours it is up to you to decide as it all depends on the
physics you are trying to reproduce. You may be able to calibrate the shear
and normal damping coefficients against real data, for instance. Finally,
keep in mind that the critical time step for particles with and without
damping is not the same as it should be reduced when damping is present.

Cheers,
Chiara

On 5 November 2013 14:51, lingran
<question238696@xxxxxxxxxxxxxxxxxxxxx>wrote:

> New question #238696 on Yade:
> https://answers.launchpad.net/yade/+question/238696
>
> Hi, all,
>
> About 15 years ago, a girl did an impact experiment of a boulder impacting
> onto a soil layer, now I want to reproduce her experiment by using yade.
> The problem is that her soil layer is quite big, to respect the reality,
> the numerical sample will have millions of particles, and the time step
> will be as small as 1e-8, thus the sample might never be prepared by
> gravity deposition.
>
> So my question is: how could we increase the time step while not change
> the physics? I did some two particles impact tests, it turns out playing
> with radius and density (keep mass constant) could increase time step, but
> the contact forces will also be changed, not good. So, any other ideas?
>
> Second question: Does somebody use viscous damping of
> Law2_ScGeom_MindlinPhys_Mindlin()? This contact law is said to be mature,
> but is it proper to be used in dealing with dynamic problems?
>
> Thanks.
> Regards.
> Lingran
>
>
> --
> You received this question notification because you are a member of
> yade-users, which is an answer contact for Yade.
>
> _______________________________________________
> Mailing list: https://launchpad.net/~yade-users
> Post to     : yade-users@xxxxxxxxxxxxxxxxxxx
> Unsubscribe : https://launchpad.net/~yade-users
> More help   : https://help.launchpad.net/ListHelp
>

-- 
You received this question notification because you are a member of
yade-users, which is an answer contact for Yade.