When the predefined Heat Transfer with Radiative Beam in Absorbing Media interface () is added (found under the Heat Transfer branch () of the Model Wizard or Add Physics window), it combines the Heat Transfer in Solids and the Radiative Beam in Absorbing Media interfaces to model heat transfer by conduction, convection, and radiation in absorbing (semitransparent) media.

As a predefined multiphysics coupling, Heat Transfer in Solids and Radiative Beam in Absorbing Media interfaces are added to the Model Builder. In addition, a Multiphysics node is added, which automatically includes the Heat Transfer with Radiative Beam in Absorbing Media multiphysics coupling feature.

The Heat Transfer in Solids interface provides features for modeling heat transfer by conduction, convection, and radiation in optically thick media. A Solid model is active by default on all domains. All functionality to include other heat transfer models, like Fluid, is also available.

The Radiative Beam in Absorbing Media interface provides features to model the attenuation of an incident light within a semitransparent material due to absorption. The beam intensity is determined using the Beer–Lambert Law. As the beam is absorbed it deposits energy which acts as a heat source. An Absorbing Medium model is active by default on all domains, and a Transparent Surface node is active on all boundaries.

The Heat Transfer with Radiative Beam in Absorbing Media multiphysics coupling is also available when there is at least one of each of the following interfaces with the specified model activated: