Question #688685 on Yade changed:
https://answers.launchpad.net/yade/+question/688685
Status: Open => Answered
Robert Caulk proposed the following answer:
>> (Triangulation does not exist. Sorry.)
This is because you are asking for flow.averageVelocity() before running
any iterations. You need to use O.run() before or while extracting
information from flow engine. If you do not run the simulation, then
there is no information for flow to give you.
emulateAction() makes a single iteration through flowengine without
running a mechanical iteration.
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