The Mixture Model, Realizable k-ε (mm) interface (
), found under the
Multiphase Flow>Mixture Model>Mixture Model, Turbulent Flow branch (
) when adding a physics interface, is used to model the flow at high Reynolds numbers of liquids containing a dispersed phase. The dispersed phase can be bubbles, liquid droplets, or solid particles, which are assumed to always travel with their terminal velocity.
The Mixture Model, Realizable 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 realizable two-equation
k-
ε model. Flow close to walls is modeled using wall functions.
The default Turbulence model type is
RANS. A different turbulence model can be selected under
Turbulence model. The default turbulence model is
Realizable k-ε.
Wall treatment for the Realizable k-
ε model can only be set to
Wall functions. More options become available by selecting another option under
Turbulence model.