Selecting a Vapor–Liquid Equilibrium multiphysics interface under the Chemical Species Transport > Vapor–Liquid Equilibrium branch of the Model Wizard, a Fluid Flow interface and a Transport of Concentrated Species in Vapor 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.

The Transport of Concentrated Species in Vapor Interface includes three dedicated boundary features for vapor transfer. The Vapor Inflow feature can be used to prescribe inflow conditions resulting from an upstream system involving a liquid. The Vapor–Liquid Interface feature can be used to model condensation and evaporation to or from a gas mixture in contact with a liquid. In the case of a liquid with multiple components, the Vapor–Liquid-Mixture Interface can be used to also model the composition in the liquid.