Ok, can I change something in Shop for the dt/2 shift or should I save
velocities and accelerations and then interpolate?
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.
Bruno
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