## 1.3. Sources

Sources are optional terms that you may attach to most equations in order to model additional or specialized physical processes. They can be specified on subdomains, points, and boundaries as described in the following sections.

This section describes:

- Locators for Sources
- Types of Sources
- Multiplying Sources by Porosity

The standard governing equations on these locators are modified to include user-defined source terms. For details, see Sources in the CFX-Solver Theory Guide.

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