[Mohsin]

Hello

I am using Energy Equation in FLuent as the flow is in high temperature medium. For density, "incompressible Ideal gas law" seems to be a good option(as it takes into account change in density with temperature). However, the known pressure (@the inlets) is 2 Bar and there is pressure variation (inlets and outlets) in the domain (the incompressible ideal gas law assumes that there is very little pressure variation), hence, as there is a pressure variation in the domain the other option "ideal gas law" (compressible) can be used. but then the Mach number (@the inlets) is well below 0.3 as the velocity is very low so again "Incompressible ideal gas law" seems to be a better option. So, What do you think, for density of the fluid (nitrogen gas) Incompressible Ideal gas law or Ideal gas law (compressible) would be appropriate in this case?
Your guidance will be highly appreciated.
Thanks