### 16.2.1. Single-Phase Fluid Sources

1. Select the Sources check box to specify sources for the point.

2. Select the equation source to specify.

   Equation sources include other sources such as mass fraction, energy, continuity (mass), turbulence, Additional Variables, and so on. For details, see Source Coefficient / Total Source Coefficient in the CFX-Solver Modeling Guide.

3. Select the Continuity check box to set sources for the continuity equation.

   For details, see Mass (Continuity) Sources in the CFX-Solver Modeling Guide.

Additional information is available in:

- Sources in the CFX-Solver Modeling Guide

- General Sources in the CFX-Solver Modeling Guide.

#### 16.2.1.1. Component Mass Fractions

This is only available when mixtures are included in the fluids list in the domain. You can specify a Total Source and an optional Total Source Coefficient for improved convergence for strongly varying sources. For details, see General Sources in the CFX-Solver Modeling Guide.

#### 16.2.1.2. Additional Variables

Set the Total Source for the Additional Variable and an optional Total Source Coefficient. A source for an Additional Variable can be set only if it is solved for.

#### 16.2.1.3. Continuity

`Continuity` sources differ from other sources because you are introducing new fluid into the domain. Properties that are required of the fluid, which is entering the domain, appear in the Variables section of the form. These values are not used if the source is negative, because no new fluid is introduced into the subdomain. For details, see Mass (Continuity) Sources in the CFX-Solver Modeling Guide.

##### 16.2.1.3.1. Continuity Option

The value of the mass source is set using the Total Fluid Mass Source option. For details, see Mass (Continuity) Sources in the CFX-Solver Modeling Guide.

##### 16.2.1.3.2. Additional Variables

Set a value for any Additional Variables that are introduced with the mass source. For details, see Mass (Continuity) Sources in the CFX-Solver Modeling Guide.

##### 16.2.1.3.3. Component Mass Fractions

Enter mass fractions of each of the components in the mass source. For details, see Mass (Continuity) Sources in the CFX-Solver Modeling Guide.

##### 16.2.1.3.4. Temperature

Enter the temperature for the mass source.

##### 16.2.1.3.5. Velocity

Set velocity components for the mass source.

#### 16.2.1.4. Energy

A total source for the energy equation can be set. The optional Total Source Coefficient provides improved convergence for strongly varying sources. An energy source can set specified when the parent domain models heat transfer using the thermal energy or total energy models.

#### 16.2.1.5. Turbulence Eddy Dissipation or Turbulence Kinetic Energy

When the flow is turbulent, a total source for the `Turbulence Eddy Dissipation` or `Turbulence Kinetic Energy` can specified. The optional Total Source Coefficient provides improved convergence for strongly varying sources. For details, see General Sources in the CFX-Solver Modeling Guide.

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