The Equilibrium Discharge Heat Source multiphysics coupling () represents the source term Q (SI units: W/m3) in the heat equation implemented by

The source term Q includes three selectable source/sink components:

Note that the enthalpy transport term prevails, for instance, in the boundary layers close to electrodes in a fully ionized electric discharge, Ref. 1.

The Label is the default multiphysics coupling feature 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 feature in the model) is phs1.

By default, the Include enthalpy transport, Include Joule heating, and Include volumetric net radiation loss check boxes are selected. From the list, select a Total volumetric emission coefficient Qrad (SI unit: W/m3) — From material (the default) or User defined. For User defined, enter a value or expression in the field. The heat source component are selectable in order to be able to see the effect of each of the component on the plasma dynamics.

This section defines the physics involved in the Equilibrium Discharge 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 Equilibrium Discharge Heat Source node from a physics interface. If the physics interface is removed from the Model Builder, for example Heat Transfer in Fluids is deleted, then the Heat transfer list defaults to None as there is nothing to couple to.