[Algebraist]

Hello,

I am trying to simulate two infinitively long square ducts connected by a small gap. I would like to map the velocity and pressure from the outlet to the inlet, and raise the values of the pressure field by a flat value to drive the flow that way.

Here is an image of my geometry:


I'm uncertain what boundary condition would allow me to do so, as the list of standard boundary conditions is somewhat sparse on detail, and a Google search hasn't been very helpful either. Does anyone have a recommendation?

Thank in advance.