Fluid sources can be set when more than one fluid is selected. The options depend on the type of simulation you are running, and whether bulk sources are used.
Select the fluid from the Fluid Specific Source Point Sources list
Select the check box next to the selected variable to enter a source, then select the Continuity check box.
Enter a value for Total Source.
Optionally, enter a total mass source coefficient for either pressure or volume fraction.
For details, see Source Coefficient / Total Source Coefficient in the CFX-Solver Modeling Guide.
Set the values for the continuity equation.
For details, see Mass (Continuity) Sources in the CFX-Solver Modeling Guide.