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[Luc Scholtès <question210907@xxxxxxxxxxxxxxxxxxxxx>]

Question #210907 on Yade changed:
https://answers.launchpad.net/yade/+question/210907

Luc Scholtès proposed the following answer:
OK, so the problem is more general that just "rolling moment related" as
I supposed it was...

Maybe you should open questions for each problem because it is difficult
to see where exactly is your point. Moreover, each of them is
susceptible to interest YADE users ;-)

I see 2 distinct problems from your previous questions:

1 - Do we consider initial porosity as the one obtained without
confinement or the one corresponding to the isotropic state pre-
compression? Good question I would say... I would also say that it is
difficult to generate an homogeneous sample using DEM without
confinement, and I think (guys, tell me if I am wrong) that in most
cases, when DEM users talk about initial porosity, it is the one
obtained under isotropic confinement (the lowest confinement if you plan
to run a series a triaxial compressions). BTW, is there a big change in
the porosity of your real specimen when you go from 0 to 50kPa
confinement?

2 - Is there any problem with rolling moment law? Why rolling stiffness
does not impact my macroscopic result? If this one is actually of
concern, maybe have a look to triax-cohesive.py as suggested by Bruno.

Hope it helps...

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