[Danfellows]

I am running a simple 3D simulation of water through a venturi pipe. However when I take a velocity profile of the flow throughout the constraint part of the geometry, the lowest velocity point is in the middle of the geometry, with the highest along the walls, as shown in the attachment.

I have a velocity inlet and an outflow outlet. I have tried having a pressure outlet and get the same result. When I try mass outflow, I get a floating exception even after increasing mesh quality.

Would anyone be able to help resolve this issue, please?