The mass source contribution, 
, to the conservation equation
for the fluid mass is specified exactly as for a general source.
The mass source contributes an additional term to all other
transported variables 
:
 | (1–195) |
The exterior 
must be specified in the case that 
is positive, in which case,
the source behaves very much like an inlet boundary condition.
For details, see Mass (Continuity) Sources in the CFX-Solver Modeling Guide.