Be careful. In the case of low MAch number flows, the user must ensure the coherence between the reference values of physical quantities defined in the namelist
"Fluid_Properties" (temperature, density and molecular mass), the initial temperature field over the domain (see the namelist
"Temperature_Initialization") and the species mass fractions defined here.
Keep in mind that the reference value of thermodynamic pressure is calculated from the reference values of temperature, density and molecular mass of the fluid (see namelist
"Fluid_Properties") .
The density field is then initialized from the fields of temperature and species mass fractions by considering the thermodynamic pressure is uniform over the domain (low Mach-number hypothesis).