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. In addition to the default Initial Values node always present in the interface, you can add more Initial Values nodes if needed.

For User defined, enter a value or expression for the initial value of the Temperature T (SI unit: K). The default value is approximately room temperature, 293.15 K (20 ºC). Else, select an Ambient temperature defined in an Ambient Thermal Properties node under Definitions.

Physics Tab with interface as Heat Transfer, Heat Transfer in Solids, Heat Transfer in Fluids, Heat Transfer in Porous Media, Heat Transfer in Building Materials or Bioheat Transfer selected:
Domains>interface>Initial Values