The Multiphase Flow in Porous Media multiphysics coupling node () links bidirectionally the Phase Transport in Porous Media and Darcy’s Law interfaces.

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 mfpm1.

When nodes are added from the context menu, you can select Manual (the default) from the Selection list to choose specific domains to define the multiphase flow coupling, or select All domains as needed.

When Multiphase Flow in Porous Media is added as an effect of adding a Multiphase Flow in Porous Media interface, the selection is the same as for the participating physics interfaces.

Only domains that are active in the participating physics interfaces (which are chosen from the Coupled Interfaces selection list) can be selected.

This section defines the physics involved in the multiphysics coupling. The Phase transport and Flow in porous media lists include all applicable physics interfaces.

You can also select None from either list to uncouple the Multiphase Flow in Porous Media node from a physics interface. If the physics interface is removed from the Model Builder, for example Darcy’s Law is deleted, then the Flow in porous media list defaults to None as there is nothing to couple to.