This node adds an initial value for the temperature that can serve as an initial condition for a transient simulation or as an initial guess for a nonlinear solver. If more than one set of initial values is needed, add an Initial Values node from the Physics toolbar.

For User defined, enter a value or expression for the initial value of the Temperature T. The default is approximately room temperature, 293.15 K (20º C). Else, select an Ambient temperature defined in the Ambient Settings section of a Heat Transfer or Heat Transfer in Shells interface.

Physics Tab with Heat Transfer in Thin Shells selected:
Boundaries>Heat Transfer in Thin Shells>Initial Values