I am simulating oxygen flow in a 3D nozzle using Pressure inlet and pressure outlet boundary conditions. I am getting the mass conservation but energy is not being conserved. I am using ideal gas for density calculation and density solver for compressible flow.
After converging, I am getting Mach number 2.13 and temperature 153K at nozzle exit velocity. I have set 300K total temperature.
I have run the simulation for hydrogen gas using the same operating conditions and temperature goes down to 156K and velocity to 2025m/s. But, Joule-thomson effect describes for Hydrogen and Helium , temperature either remain same or increase.
What could be the reason of it? How Can I correct my system??