The Coupling Type Contribution node (), which can be added as a subnode to any of the multiphysics coupling nodes, defines a physics interface context in which you can add variable declarations, variable definitions, equations, and so forth. The contributions behave as if they were added by a physics feature under the physics interface. All contributions that do not belong to any context use the multiphysics coupling as context. The context decides the default scope of variables and function names, for example. The Settings window contains the following section:

Choose the coupling type that the contributions should be restricted to using the Restrict to coupling type list.