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[Chiara Modenese <question191800@xxxxxxxxxxxxxxxxxxxxx>]

Question #191800 on Yade changed:
https://answers.launchpad.net/yade/+question/191800

    Status: Open => Answered

Chiara Modenese proposed the following answer:
Hi,

I hope to interpret correctly what you are saying. Your time step is too
small and thus your test runs very slowly. It is a well known issue and
you can workaround it by increasing the mass of your particles, for
instance.

HTH,
Chiara 


On 27 Mar 2012, at 03:55, wangxiaoliang wrote:

> New question #191800 on Yade:
> https://answers.launchpad.net/yade/+question/191800
> 
> Hi all
> 
> In example , the box is usually 10*10*10 or 1*1*1, and particles size is usually a bit larger than the size of real sand.
> 
> However, when I tried to model grenoble sand (d50 = 0.33mm), I use two contact model
> 
> 1, hertz model
> 
> 2, Moment material model
> 
> in both model, after the isotropic compression, in the deviatoric compression process, usually the strain response is 
> 
> very very small. 1000 step just make the strain in y direction go forward about 1e-6 or 1e-7.
> 
> So it needs maybe month or year to  achieve a final strain in y of 0.3, say.
> 
> In my opinion, a high rigid modulus (usually quartz GPa), induce a  high P wave speed, and a smaller size makes dt = r/ vp even
> 
> much more smaller than the usual sample in the tutorial(usually mod. = 1e5~6Pa, and particle size .5m)
> 
> So I do not know how to deal with this ques.
> 
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