Ansys 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.
For VOF or mixture models, there is no momentum source.
For the Eulerian model, the momentum source in a cell for phase 
is
 | (14–571) |
and for phase 
is
 | (14–572) |
For all multiphase models, the following energy sources are added.
The energy source in a cell for phase 
is
 | (14–573) |
and for phase 
is
 | (14–574) |
where 
and 
are the formation enthalpies of species 
of phase 
and species 
of phase 
, respectively. The difference
between 
and 
is the latent heat.
