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[Jérôme Duriez <question280717@xxxxxxxxxxxxxxxxxxxxx>]

Question #280717 on Yade changed:
https://answers.launchpad.net/yade/+question/280717

    Status: Open => Answered

Jérôme Duriez proposed the following answer:
Hello,

The good news is that you're from far not the first one to face such
issue. A first quick search for "psd porosity" in the Launchpad answers
page returns many answered questions very similar to yours ;-)

I'd suggest more or less randomly to give a close look to e.g.
https://answers.launchpad.net/yade/+question/270818 (it has the
advantage to be recent)

As you will see, makeCloud can only be used to ... make a cloud: a
particle sample in a "gaseous" state. In particular you have no chance
to get an actual sample with the porosity equal to the "porosity"
attribute value of makeCloud, if this value is the one of a solid-like
sample. I understand it's weird...

Then, the idea is to apply in a 2d step a mechanical loading (isotropic
compression, typically) to this cloud to obtain the desired porosity.
Regarding this stage, a tutorial example frequently refered to in
previous questions will definitively help. See
https://github.com/yade/trunk/blob/master/examples/triax-tutorial
/script-session1.py#L141

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