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[Bruno Chareyre <question466297@xxxxxxxxxxxxxxxxxxxxx>]

Question #466297 on Yade changed:
https://answers.launchpad.net/yade/+question/466297

    Status: Open => Answered

Bruno Chareyre proposed the following answer:
Hello,
Some settings of PeriodicFlowEngine are apparently missing.
You need to tell explicitely which bodies are used as walls:
flow.wallIds=[-1,-1,1,0,-1,-1]
and there is an internal variable of the periodic triangulation that could be increased to help generating a correct triangulation:
flow.duplicateThreshold=0.5 (the default 0.06 is ok only for large numbers of particles)

However, I tried both in your script without success. I suspect that the regular packing of the top layer could be the problem. The periodic mesh is not built robustly in this case because the triangulation is not unique. You could first try to remove this layer. 
If it solves the problem then you could reintroduce it by adding a noise on positions of the regular packing. A limited disorder is usually enough to avoid the degenerate cases.

Bruno

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