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[Jan Stránský <question259096@xxxxxxxxxxxxxxxxxxxxx>]

Question #259096 on Yade changed:
https://answers.launchpad.net/yade/+question/259096

Jan Stránský proposed the following answer:
Hi Behzad,

The reason is in inprecise computer numbers representation. append
following to the end of your script:

O.step()
print max(i.geom.penetrationDepth for i in O.interactions)

it gives me 5.204170427930421e-18. So between spheres there is some really
minimal force. For stable O.dt it is no problem at all, for O.dt > critical
time step (as you tried), the simulation will of course become instable.
cheers
Jan



2014-12-15 19:56 GMT+01:00 behzad <question259096@xxxxxxxxxxxxxxxxxxxxx>:
>
> Question #259096 on Yade changed:
> https://answers.launchpad.net/yade/+question/259096
>
> behzad posted a new comment:
> Try to increase the time-step!
> if you put O.dt= 3.0e-5 or bigger the particles move!
>
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