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[Jan Stránský <question696302@xxxxxxxxxxxxxxxxxxxxx>]

Question #696302 on Yade changed:
https://answers.launchpad.net/yade/+question/696302

    Status: Open => Answered

Jan Stránský proposed the following answer:
Hello,

the results may be affected by many factors, just some brainstorming.
- effect of walls (friction, stiffness, size w.r.t real sample...)
- particle size distribution (uniform size, real PSD, ...)
- porosity computation (voxel resolution in case of voxelPorosity)
- friction of particles themselves
- ...

Particles in different heights are subjected to pressure roughly
proportional to height (?), so you can test smaller samples for
different pressures and see the response. (instead of a big simulation).

Cundall-Strack model is linear, so some linearity in porosity might be expectable.
Hertz-Mindlin is, contrary, non-linear, producing higher force for increasing overlap, so I would expect the response as you want - lower decrease of porosity with increasing stress..
Same results for the basic linear model and Hertz-Mindlin model would be surprising..

So definitely for (some) different models you should get different trends.
Accurate fitting is a different story :-)

cheers
Jan

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