The Compressible Potential Flow Model node adds equations for time-dependent or stationary modeling of compressible potential flow. The model will solve for the mean flow velocity potential and the density. The pressure and the velocity field are defined from these dependent variables.
For the Ratio of specific heats γ (dimensionless) select
From material (the default) or
User defined. For the
User defined option, the default value is 1.4.
Enter a Force potential ψ (SI unit: J/kg). To model a domain force or domain source acting on the fluid.
Select the Calculate temperature option it you need to also calculate the temperature field in the fluid. If this is selected, you also need to specify the
Specific gas constant Rs (SI unit: J/(kg·K)). Select
From material (the default) or
User defined. Enabling this calculates the temperature according to
where pA is the pressure and
ρ the density in the fluid.
Depending on the material selected in the Materials node for the fluid (typically Air) the
Model Inputs may be active. Per default the
Absolute pressure is taken from the model itself (unavailable). If the
Calculate temperature option is enabled the
Temperature is also taken from the model (unavailable). This will give a physically consistent solution. In both cases, you can click the
Make All Model Inputs Editable icon to enter a user defined expression.
