yade-users team mailing list archive
Mailing list archive
Re: [Question #689409]: particles go out of the container
Question #689409 on Yade changed:
Status: Open => Answered
Jan Stránský proposed the following answer:
> I'm wondering what's the possible reasons that the particles go out the box, except for the timestep.
e.g. stiffness :-) try to increase stiffness of the walls
> maxDt = 0.6*PWaveTimeStep()
> even though I set the timestep smaller than the critical timestep and also limited the maximum timestep. the particles still go out of the container.
here I am betting on the stiffness, but in general a time step below the
critical value makes the simulation stable, but it does not necessarily
help in this problem - e.g. if by some circumstances the velocity of
particles is such high that it goes through the wall without even
detecting the contact, the critical time step has no way how to help in
The factors 0.6 and 0.5 might easily be on the edge of the actual system
critical time step for dense packing. PWaveTimeStep just computes the
critical value for a single sphere-sphere pair, but in the dense packing
there might be several interactions "in the same direction", making the
system "stiffer" and you might need even lower value.
You received this question notification because your team yade-users is
an answer contact for Yade.