Water tunnel simulation
 

Hello everyone
I'm trying to simulate a water tunnel in 2D that has not velocity boundary condition, but it has a defined x-velocity profile at y=H/2 for all the water tunnel length.
I have created the desired velocity profile to be loaded in Fluent, and Have chosen it as a fixed value in cell zone condition. I have selected pressure inlet and outlet boundary conditions, but when I run the simulation the results shows a stagnated flow.
Could anyone help me please?
Thanks in advance,
Alex