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[Chareyre <question153042@xxxxxxxxxxxxxxxxxxxxx>]

Question #153042 on Yade changed:
https://answers.launchpad.net/yade/+question/153042

Chareyre proposed the following answer:
Two ways:
1- Use a geometric algorithm (e.g. K. Bagi papers) , but then the
stability of the obtained packing is not guaranteed and controlling
porosity is more difficult (especially if you fix PSD).
2- Use stress controller, and when you get the correct porosity, unload
it to a near-zero stress, as proposed by Chiara. This packing will be
mechanically stable.

For controlling porosity, you basically maintain a constant stress and
decrease friction progressively:
while (porosity>target):
    friction=friction*0.99
    cycle(1000)

I recommend method 2 unless you really need a 0-stress packing exactly.
But why would you need that if you can always get a a stress negligeable
vs. futur applied load with method 2?

Bruno

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