I am new to flow simulation and am trying to simulate the flow of air through a constricted area with a couple small outlets. I know air inlet air supply pressure, is there a way to measure the conditions (pressure and mass flow rates) at the outlet? When I try to set boundary conditions for the outlet, it wants me to set the parameters which I don't know. Do I need to set a boundary condition for the outlet? Or is just setting goals on the outlet surface good enough? I am using internal flow, but maybe I should be using external?