Question #660540 on Yade changed:
https://answers.launchpad.net/yade/+question/660540
Status: Open => Answered
Jan Stránský proposed the following answer:
Hello,
in general, Yade does not put any limitations for the parameters values. But is
assumes you choose them "reasonably". Reasonable means e.g. positive stiffness.
However, in certain cases it may treat "non-reasonable" values in a special
way, like for etaRoll<0, "If negative, rolling moment will be elastic" (from
the docs).
The specific use always depend on your problem and level of simplification.
E.g. you can simulate non-spherical particles with spheres and "non-realistic"
higher friction angle.
E.g. in your case, young=1e6 (assuming Pa units) seems too low to me, but it
may be the best value at the same time :-)
Some notes about a few parameters:
- elastic parameters (E, Ks/Kn and alphaKr in your case) should be identified
first, as their response is independent on the inelastic parameters.
- phi, friction angle, has reasonable values in the range [0,pi/2]
- I would first try the model without rolling stiffness and resistance. If it
gives good results, I would choose the more simple model.
You can also try some dimensional analysis to reduce parameters for
calibration. E.g. you will find that Poisson's ratio depends on Ks/Kn
and etaRoll, but not on E etc.
cheers
Jan
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