pressure boundary for NS

i've been trying to setup fixed pressure boundaries (and other types) but have run into a wall. (an understanding boundary )

this is what i have....

(see two comments down for image)






seems fine as you move away from the boundary, but near the pressure boundary there is a mesh dependent spacial oscillation.

i've tried all sorts of mesh's and time steps, but its always like this.

attachment test comment, not working in forefox