The Reacting Turbulent Flow, k-ε multiphysics interface is used to simulate flow in the turbulent regime coupled to species transport in a gas or liquid.

It combines the Turbulent Flow, k-ε and Transport of Concentrated Species interfaces. The Reacting Flow multiphysics coupling, which is added automatically, couples the fluid flow and mass transport and applies turbulence modeling for the mass transport. The species transport supports both a mixture, where the concentrations are of comparable order of magnitude, and low-concentration solutes in a solvent.

The equations solved by the Turbulent Flow, k-ε interface are the Navier-Stokes equations for conservation of momentum and the continuity equation for conservation of mass. Turbulence effects are modeled using the standard two-equation k-ε model with realizability constraints. Flow close to walls is modeled using wall functions.

The Transport of Concentrated Species interface solves for an arbitrary number of mass fractions. The species equations include transport by convection, diffusion and, optionally, migration in an electric field. Mass transport close to solid walls is modeled using wall functions, and reactions within the turbulent flow are modeled using the eddy dissipation model.