Fluent changes the inlet pressure
I'm working on a vortex tube simulation for my school project and for some reason I cannot get an appropriate result, while the deadline is getting short.
I've already tried to copy a 3D model from an article to see if I can get appropriate results with that, used the same turbulence models, wall treatment, inlet pressure and temperature and outlet pressures as in the article however I cannot get the same results. I've used pressure inlet and pressure outlet boundaries and ideal gas model for the air, just as in the article. I've already tried using poly-hexcore and polyhedra meshes with and without boundary layers without success.
I've seen that the residuals do not decrease sufficiently and I've monitored some properties and I've seen that Fluent keeps changing the inlet pressures/mass flow rates rapidly during the solution. Could you help me please, what could cause this problem and what can be done to overcome this? I would really appreciate your help. Thank you in advance!
Model from the article:
Mass flow rate (black -> inlet, red -> cold outlet, green -> hot outlet)
The dynamic pressure on the inlet (was set to 700,000 Pa)
The static pressures (black -> inlet, red -> cold outlet, green -> hot outlet