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[Luc Scholtès <question189913@xxxxxxxxxxxxxxxxxxxxx>]

Question #189913 on Yade changed:
https://answers.launchpad.net/yade/+question/189913

    Status: Open => Answered

Luc Scholtès proposed the following answer:
Hi Ceguo,

Try utils.porosity(X), with X the volume of your assembly and it should
work.

2012/3/7 ceguo <question189913@xxxxxxxxxxxxxxxxxxxxx>

> New question #189913 on Yade:
> https://answers.launchpad.net/yade/+question/189913
>
> Hi,
>
> The problem seems trivial but when I try using `utils.porosity` I can only
> get something like <Boost.Python.function object at ...>. The documentation
> says it should return a float.
>
> Besides, as I am using the trunk version with a 2D packing. All the
> quantities like mass, porosity, stress (averaged by area rather than
> volume) etc. should be modified accordingly. Will the code take care of
> these right now? If not, maybe we could do scaling (3D to 2D) outside the
> code. So this is not a big problem.
>
> Another problem is that the documentation says we'd better use ScGeom in
> stead of Dem3DofGeom. But as I try using `Ig2_Sphere_Sphere_ScGeom()`,
> `Ip2_FrictMat_FrictMat_FrictPhys()` and
> `Law2_ScGeom_FrictPhys_CundallStrack()`, the program runs without error but
> there is no stress generated.
>
> Ning
>
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