Use the Ray Heat Source multiphysics coupling () to compute the heat source resulting from the attenuation of rays in an absorbing medium. This heat source is defined to a dependent variable that is defined on all domain mesh elements in the selection of the Ray Heat Source node. The ray power should be solved for in the coupled Geometrical Optics interface.

The Label is the default multiphysics coupling name.

The Name is used primarily as a scope prefix for variables defined by the coupling node. Refer to such variables in expressions using the pattern <name>.<variable_name>. In order to distinguish between variables belonging to different coupling nodes or physics interfaces, the name string must be unique. Only letters, numbers, and underscores (_) are permitted in the Name field. The first character must be a letter.

The default Name (for the first multiphysics coupling in the model) is rhs1.

This section defines the physics involved in the multiphysics coupling. By default, the applicable physics interface is selected in the Source and Destination lists.

You can also select None from either list to uncouple the node from a physics interface. If the physics interface is removed from the Model Builder then the applicable list defaults to None as there is nothing to couple to.