yade-users team mailing list archive

[Václav Šmilauer <eudoxos@xxxxxxxx>]

> Vaclav, I am very grateful for your previous assistance.  It was very
> helpful for me to familiarise with yade-python.  I created a file
> which appends spheres "inBox" using randomdensepack from python
> Module-pack.  I also applied the gravity engine.  However, when
> running the script, what I saw was an 'explosion' of particles.  Many
> particles have even gone against gravity (very weird).  I have tried
> to reduce the number of particles significantly, but there is not much
> difference.  
>  
> This would mean that initially in the generation, there had been
> overlapping/penetration between particles?  Or, have I done something
> incorrectly?  Anyone, please help.

Oh yes, the packing is not stess-free (for that, you would have to use
some sort of geometric algorithm). But as long as you have cohesive
material (which is the case for rock, as far as I know ;-) ), you can
say that the initial distance of spheres is equilibrium for that bond;
that's what I do for concrete and it works well.

Someone else besides me and Anton uses cohesive material && how do you
deal with this?

HTH, Vaclav