Question #662105 on Yade changed:
https://answers.launchpad.net/yade/+question/662105

Bruno Chareyre posted a new comment:
Hi Luc,
First, the pressure gradient is not "along periodic boundary conditions". It is 
just the pressure gradient, a vector.
Second, what made you think that boundaryUseMaxMin=[0,0,1,1,0,0] was somehow 
related to defining the pressure gradient?? Is there something in the doc along 
this line (I shall then fix)?
boundaryUseMaxMin defines if the problem is (=0) bounded by a stateful 
yade.body (a plane typically) which displacements are reflected in the flow 
problem, or (=1) by an imaginary static plane placed at the min/max particles 
coordinates (its position is adjusted in time but its velocity is always zero 
from the fluid point of view).
If boundaryUseMaxMin=1 of course the corresponding id of the wall need to be 
defined.
If wallIds=[-1,-1,1,0,-1,-1]  and boundaryUseMaxMin=[1,1,0,0,0,0] it means the 
position of the boundaries at x- and x+ are retrieved by body ids -1 and -1.
I guess you can imagine what happens after that (well, I can't imagine really, 
but nothing good for sure).
Cheers
Bruno

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