With cavitation transport models, the bulk motion of mixture of the liquid and gas (vapor and other possible gases) is treated as a variable density single-phase flow. The set of general governing equations for the mixture flow is the same as that for multicomponent flows, while a transport equation is specifically formed to govern the vapor mass fraction generated in cavitation. To model the effects of noncondensable gases, additional transport equations for gas mass fractions may also be solved, depending on the gas models. The complete set of general governing equations solved for cavitating flows follows:

Depending on the cavitation models, different equations (between zero and two) are solved as noncondensable gas, dissolved gas, and so on.

For turbulent flows, the turbulent viscosity μt is obtained from solving the turbulence modeling equations. The turbulent Prandtl numbers σt, σv, σ g are predescribed model parameters. The details of the turbulence models are given in the Turbulence module.

In the transport equations, the mixture properties are calculated using the following relations: