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[Bruno Chareyre <question697195@xxxxxxxxxxxxxxxxxxxxx>]

Question #697195 on Yade changed:
https://answers.launchpad.net/yade/+question/697195

Bruno Chareyre proposed the following answer:
As the name suggests, PeriodicFlowEngine is for periodic (no-)boundary
condition. So no it is not really a "boundary" value problem. It is a
periodic field problem.

flow.pressureForce=True will compute the drag forces (from both pressure
and viscous stress) resulting from macroscopic sliding velocity between
the two phases.

The other flags are related to lubrication forces: short range pair interactions playing against the relative movement of particles. These forces were added on the top of the drag forces _after_ Catalano 2011.
See [2,3]

[2] https://link.springer.com/content/pdf/10.1007/s10035-015-0560-6.pdf
[3] https://www.sciencedirect.com/science/article/pii/S0032591020305064

Bruno

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