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[Jan Stránský <question628632@xxxxxxxxxxxxxxxxxxxxx>]

Question #628632 on Yade changed:
https://answers.launchpad.net/yade/+question/628632

    Status: Open => Answered

Jan Stránský proposed the following answer:
Hi Tina,

I am not very familiar with CohFrictMat, but one solution is to set
proper unp value of existing interactions such that the interactions are
force-free. Then the simulation should not explode (or the problem is at
different place). Form more info, search other questions.

I am also not very familiar with randomDensePack without spheresInCell
parameter, but if it gives not good results, you can create your own
function doing the compaction. The advantage is that after the function
creation, you should understand more the process and can "bend" it tou
your needs (like using arbitrary shape to compress instead of cubic
shape and then cropping it).

Before trying to get desired porosity value, decide if you use particles with the same radius or some PSD.
With uniform radius, you: -
- either unlikely reach porosity less than 0.3 with compression and decompression to stress-free state, but with randomDensePack approach it is random and isotropic
- or use regularHexa packing, but then it is not random anymore and has some "crystallography", which may affect your results

with non-uniform particle size, you have much more space to play from
porosity point of view, but it has also its disadvantages

everything depends on your simulation, purpose, expected results etc :-)

cheers
Jan

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