Federico Alzamora Previtali

The solution you get is bounded by the boundary conditions that you define. If your outlet BC is set to 0psi gauge pressure, the solver will aim towards that value for its solution. Hence, by definition you should get 0psi for a converged solution.

What is curious to me is that you define both the inlet velocity and pressure at the inlet. The Supersonic/Initial Gauge Pressure for velocity inlets is typically used for supersonic inlets, which is not the case for you. You should leave it at 0psi.