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[Jérôme Duriez <question314841@xxxxxxxxxxxxxxxxxxxxx>]

Question #314841 on Yade changed:
https://answers.launchpad.net/yade/+question/314841

    Status: Open => Answered

Jérôme Duriez proposed the following answer:
Thank you for reducing the script, it's much better. Regarding your
questions:

- If you think "the strain rate does nothing" the best thing to do is to
ask for the positions of the walls boundaries and check if they move or
note.

- a "NaN" unbalanced force normally means all interactions forces are
zero. It is indeed your case here.

In fact, you have only one interaction here, between your spheres (explore O.interactions from command line or through "Inspect" from the Graphical Interface)..
Your simulation is not consistently defined to allow wall-spheres interactions because walls are "FrictMat" and spheres "JCFpmMat".
Indeed, interaction between the two is not possible, it would require some Ip2_FrictMat_JCFpmMat_SomePhys which is not your script nor in YADE in general 


Again, you have here two problems: one about interaction definition, and a second one about the use of TriaxialStressController.
Separating the two would highly help solve both (if you keep reducing your script, you should succeed !)

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