### 1.8.3. Mass (Continuity) Sources

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 :

| (1–191)

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.

Release 18.2 - © ANSYS, Inc. All rights reserved.