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)
https://ngsolve.org/media/kunena/attachments/1558/main.py
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: c420572a7e62ca7f9789ee890b229dc6