It combines the Mixture Model, Low Re k-ε, the Continuous Phase Transport of Diluted Species interface and the Dispersed Phase Transport of Diluted Species interface. The Dispersed Two-Phase Flow, Diluted Species multiphysics coupling, which is added automatically, couples the two-phase flow with mass transport. The mass transport interfaces solve for the development of one or several solutes present in the continuous and dispersed fluid phase. The interface can be used for stationary and time-dependent analysis in 2D, 2D axial symmetry, and 3D.

The Mixture Model, Low Re k-ε interface solves one set of Navier–Stokes equations for the momentum of the mixture. The pressure distribution is calculated from a mixture averaged continuity equation and the velocity of the dispersed phase is described by a slip model. The volume fraction of the dispersed phase is tracked by solving a transport equation for the volume fraction. Turbulence effects are modeled using the AKN two-equation k-ε model with realizability constraints. The AKN model is a so-called low-Reynolds-number model, which means that it can resolve the flow all the way down to the wall. The AKN model depends on the distance to the closest wall. The physics interface therefore includes a wall distance equation.

Continuous Phase Transport of Diluted Species interface solves for an arbitrary number of solute concentrations present in the continuous phase. The species equations include transport by convection, and diffusion within the phase, as well as reactions and solute extraction between the continuous and dispersed phase. Mass transport close to solid walls follows the setting in the coupled Mixture Model, Low Re k-ε interface. Using wall functions for the fluid flow, wall functions are applied also for the mass transfer. Using a Low-Reynolds-number wall treatment, the mass transfer conditions are applied directly at the wall.

Dispersed Phase Transport of Diluted Species interface solves for an arbitrary number of solute concentrations present in the dispersed phase. The species equations include transport by convection, and diffusion within the phase, as well as reactions and solute extraction between the continuous and dispersed phase. Mass transport close to solid walls follows the setting in the coupled Mixture Model, Low Re k-ε interface. Using wall functions for the fluid flow, wall functions are applied also for the mass transfer. Using a Low-Reynolds-number wall treatment, the mass transfer conditions are applied directly at the wall.