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[Chareyre <question191800@xxxxxxxxxxxxxxxxxxxxx>]

Question #191800 on Yade changed:
https://answers.launchpad.net/yade/+question/191800

Chareyre proposed the following answer:
>a high rigid modulus (usually quartz GPa), induce a high P wave speed,
and a smaller size makes dt = r/ vp even much more smaller than the
usual sample in the tutorial

This statement is correct.
The thing that puzzles me in your question is you don't mention the number of particles, which is for sure the first parameter to consider.

>So I do not know how to deal with this ques.

Use a smaller number of particles?

The number of particles aside, changing mass and/or strain rate does not help in general (unless strain rate is excessively small initially, of course), because higher mass needs slower strain if you don't want to get inertial effects in your results (similarly, faster strain needs smaller mass).
The only way to speed things up is to decrease stiffness.

"Then how can I simulate 10e10 particles with stiffness 10e12", you may
ask. You can't, or you have to be very patient.

Also note that GlobalStiffnessTimeStepper will help you to find the
largest possible timestep, while PWave only gives a rough estimate.

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