### 14.2.5. Boundary Solid Values Tab

#### 14.2.5.1. Heat Transfer

##### 14.2.5.1.1. Adiabatic

The heat flux across the boundary is zero. The boundary is insulated.

##### 14.2.5.1.2. Fixed Temperature

The boundary is fixed at a specified temperature Tw .

##### 14.2.5.1.3. Heat Flux

A heat flux is specified across the boundary. A positive value indicates heat flux into the domain.

##### 14.2.5.1.4. Heat Transfer Coefficient

In this case, the heat flux at a boundary is implicitly specified using an external heat transfer coefficient, h c, and an outside or external boundary temperature, T o. This boundary condition can be used to model thermal resistance outside the computational domain. The heat flux, when calculated using the Heat Transfer Coefficient, is:

| (14–1)

where T o is the specified outside or external boundary temperature and Tw is the temperature at the boundary (edge of the domain).

##### 14.2.5.1.5. Conservative Interface Flux

`Conservative Interface Flux` implies that the heat flow in question will be between the current solid on this boundary and another solid on the other side of the interface. This means that `Conservative Interface Flux` must also be used on the boundary on the other side of the interface. Accordingly, the CFX-Solver will not be able to handle cases where `Conservative Interface Flux` is set on just one side of the interface, or where the quantity being transferred does not exist on the other side. CFX-Pre will issue a warning if either of these cases exist.

#### 14.2.5.2. Additional Variables

See Boundary Details and Fluid Values Tabs for Boundary Condition Objects for details.

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