For compressible flows, the gas law is as following:
|=||the local relative (or gauge) pressure predicted by FLUENT|
|=||the Operating Pressure|
Density Inputs for the Ideal Gas Law for Compressible Flows
The inputs for the ideal gas law are as follows:
Specify the ideal gas law individually for each material that you want to use it for. See Section 8.3.7 for information on specifying the ideal gas law for mixtures.
Define Operating Conditions...
| The input of the operating pressure is of great importance when you are computing density with the ideal gas law. Equation
8.3-6 notes that the operating pressure is added to the relative pressure field computed by the solver, yielding the absolute static pressure. See Section
8.14 for recommendations on setting appropriate values for the operating pressure. By default, Operating pressure is set to 101325 Pa.