semi-periodic boundary conditions for channel flow
 

Hi,


I am trying to solve a channel flow with leaks. I know the leak pressure (reference 0), and I know the pressure drop within the pipe channel.


I want from CFD to get the pressure within the channel. Here a sketch


-------------------------------------------

p_in . . . . . . . . . . . . . . . . . . . . . p_out = p_in-5

-----| |------------------------------------
. p = 0


How can I set something like this in openfoam? What would you advice me?


+ mappedField? This is not working per se, maybe with some dict... I am using snappyHexMesh for meshing (I need to, there are more objects in the flowfield, but the channel is straight and nearestPatchFace should work I guess)

outlet
{
type mappedField;
sampleMode nearestPatchFace;
samplePatch inlet;
field p;
setAverage no;
average 0;
offset (0 0 0);
value uniform 0;
}


I also used nearestPatchFaceAMI, but I get error.


If it worked I would have needed some short of
setAverage no;
average $inlet-5; // I guess you understand this pseudo code



+ some short of cyclic?
+ Any better idea?


Thank you!