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[Jan Stránský <question682095@xxxxxxxxxxxxxxxxxxxxx>]

Question #682095 on Yade changed:
https://answers.launchpad.net/yade/+question/682095

    Status: Open => Answered

Jan Stránský proposed the following answer:
Hi Miguel,

> the model runs very slow with the real PSD

could you post the values you use?
The critical time step depends on particle size, its density/mass and stiffness
t_cr = R * sqrt(density/young) [1]
the smaller particles, the smaller critical time step, the smaller simulation. Real PSD could contain very small particles.

some options:
- artificially "cut" the PSD, not including the smallest particles
- increase mass of the smallest particles to increase critical time step (google selective mass scaling, advanced mass scaling or such).

cheers
Jan

PS: as it is quite different question than the original one, next time
please open a new question [2]

[1] https://yade-dem.org/doc/formulation.html#stability-considerations
[2] https://www.yade-dem.org/wiki/Howtoask

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