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[Jan Stránský <question615644@xxxxxxxxxxxxxxxxxxxxx>]

Question #615644 on Yade changed:
https://answers.launchpad.net/yade/+question/615644

Jan Stránský proposed the following answer:
Hello,

> As far as I know, the time-step calculated by the
GlobalStiffnessTimeStepper increases with the increasing of the particle
density

as DEM is discrete, as Robert mentioned, the important quantity is body
mass, not its material density

you can try:

b = O.bodies[someID]
print b.state.mass
b.mat.density = 100000000
print b.state.mass # has no effect on existing bodies

So the correct approach should be

for b in O.bodies:
   b.state.mass *= someFactor

cheers
Jan

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