Use this subnode to specify the temperature on the exterior of a thin layered shell or a thin film (downside and/or upside). As a subfeature of Thin Film, it is only applicable when Thin Film model is set to General, on exterior boundaries.

By default, the temperature is specified on downside and upside. Unselect the Downside or Upside check boxes to apply the constraint on one side only.

For each side, select an Ambient temperature defined in the Ambient Settings section of a Heat Transfer or Heat Transfer in Shells interface. For User defined, enter values or expressions for T0,d and T0,u.

To display this section, click the Show button () and select Advanced Physics Options.

 Heat Transfer in Thin Shells>Thin Layered Shell>External Temperature
 Heat Transfer in Thin Shells>Thin Film>External Temperature

Physics Tab with Thin Layered Shell or Thin Film selected in the model tree:
Attributes>External Temperature