Question #701837 on Yade changed:
https://answers.launchpad.net/yade/+question/701837
Status: Open => Answered
Jan Stránský proposed the following answer:
Hello,
see source code [1,2,3,4].
If the documentation is not sufficient, fell free to create an issue on
gitlab or improve it yourself.
> What does "disk" mean in this method?
Disk is simply projection of a sphere into a plane.
Volume of a disk is area of the disk, pi*r^2.
V is computed as (true volume)/zlen
> Does this mean that we get the porosity of the particles blocked the
z-direction?
You get void ratio, not porosity.
You get the void ratio under assumption that all particles are in a
plane (not necessarily in xy), regardless blocked or not.
Cheers
Jan
[1] https://gitlab.com/yade-dev/trunk/-/blob/master/py/_utils.cpp#L890
[2] https://gitlab.com/yade-dev/trunk/-/blob/master/py/_utils.cpp#L515
[3]
https://gitlab.com/yade-dev/trunk/-/blob/master/preprocessing/dem/Shop_02.cpp#L965
[4]
https://gitlab.com/yade-dev/trunk/-/blob/master/preprocessing/dem/Shop_02.cpp#L950
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