Selecting a multiphysics interface under the Chemical Species Transport>Reacting Flow branch of the Model Wizard or Add Physics windows, one of the Single-Phase Flow interfaces (laminar or turbulent flow) and a Transport of Concentrated Species interface are added to the Model Builder.

In addition, the Multiphysics node is added, which includes the multiphysics coupling feature Reacting Flow. The Reacting Flow feature predefines and controls the couplings between the separate interfaces in order to facilitate easy set up of models.