Electromagnetic Heat Source
The Electromagnetic Heat Source multiphysics coupling node represents the electromagnetic losses, Qe (SI unit: W/m3), as a heat source in the heat transfer part of the model. It is given by
where the resistive losses are
and the magnetic losses are
Settings
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 emh1.
Electromagnetic Heat Source
This section defines the physics involved in the electromagnetic heat source multiphysics coupling. By default, the applicable physics interface is selected in the Electromagnetic list to apply the Heat transfer to its physics interface to establish the coupling.
You can also select None from either list to uncouple the Electromagnetic Heat Source node from a physics interface. If the physics interface is removed from the Model Builder, for example Heat Transfer in Solids is deleted, then the Heat transfer list defaults to None as there is nothing to couple to.
If a physics interface is deleted and then added to the model again, and in order to re-establish the coupling, you need to choose the physics interface again from the Heat transfer or Electromagnetic lists. This is applicable to all multiphysics coupling nodes that would normally default to the once present physics interface. See Multiphysics Modeling Approaches in the COMSOL Multiphysics Reference Manual.