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[Robert Caulk <question694837@xxxxxxxxxxxxxxxxxxxxx>]

Question #694837 on Yade changed:
https://answers.launchpad.net/yade/+question/694837

    Status: Open => Answered

Robert Caulk proposed the following answer:
What are 'r.txt' and 'cdf.txt?' Please review [1].

The only ways to decrease the porosity of your packing (I think that is
what you are referring to when you say 'fill factor') is to

1\ widen the distribution of sphere sizes - which probably becomes computationally prohibitive at some point due to the dependence of time-step on sphere size.
2\ Add confining pressure (and you can decrease sphere stiffness) - but this presumes your simulation will have confining pressure. 

Otherwise, you will need to accept that sphere packings intrinsically
have a minimum porosity [2]

Cheers,

Robert

[1] https://yade-dem.org/wiki/Howtoask
[2]https://en.wikipedia.org/wiki/Sphere_packing

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