FLUENT adds contributions due to mass transfer only to the momentum, species, and energy equations. No source term is added for other scalars such as turbulence or user-defined scalars.
Let be the mass transfer rate per unit volume from the species of phase to the species of phase . In case a particular phase does not have a mixture material associated with it, the mass transfer will be with the bulk phase.
The contribution to the mass source for phase
in a cell is
For VOF or mixture models, there is no momentum source.
For the Eulerian model, the momentum source in a cell for phase
For all multiphase models, the following energy sources are added.
The energy source in a cell for phase
The species source in a cell for species
Other Scalar Equations
No source/sink terms are added for turbulence quantities and other scalars. The transfer of these scalar quantities due to mass transfer could be modeled using user-defined source terms.