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[Václav Šmilauer <eudoxos@xxxxxxxx>]

> You can change in shop.
> Another note : your remark on different dt for different problems is 
> correct. PWave and GSTS both consider a dense packing.
> If you have problems where fast collisions between particles matter, 
> there is another constraint on dt. In short, particles must not go 
> through each other in only one time-step. It results in a definition of 
> dt based on size of particles and incident velocities only, disregarding 
> mass and stiffness.

If you suppose particles have subsonic velocities, that is handled by
pwave.