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 (20ºC). Else, select an Ambient temperature defined in an Ambient Properties node under Definitions.

Physics tab with interface as Heat Transfer in Solids and Fluids, or any version of the Heat Transfer interface selected:

Physics tab with Porous Medium>Fluid or Porous Medium>Porous Matrix selected in the model tree: