The Bubbly Flow, k-ε(bf) interface (
), found under the
Multiphase Flow>Bubbly Flow>Bubbly Flow, Turbulent Flow branch (
) when adding a physics interface, is used to model the flow of liquids with dispersed bubbles at high Reynolds numbers.
When this physics interface is added, the following default physics nodes are also added in the Model Builder —
Fluid Properties,
Wall (the default boundary types are
No slip for the liquid and
No gas flux for the gas), and
Initial Values.
The default Turbulence model type is
RANS. A different turbulence model can be selected under
Turbulence model. The default turbulence model is
k-ε.
Wall treatment for the k-
ε model can only be set to
Wall functions. More options become available by selecting another option under
Turbulence model.
To display this section, click the Show More Options button (
) and select
Stabilization in the
Show More Options dialog box. The settings for this section are the same as for
The Laminar Bubbly Flow Interface with the addition of this section: stabilization for the turbulence variables in the
Turbulence equations area.
To display this section, click the Show More Options button (
) and select
Advanced Physics Options in the
Show More Options dialog box. The
Turbulence variables scale parameters subsection is available when the
Turbulence model type is set to
RANS.
The Uscale and
Lfact parameters are used to calculate absolute tolerances for the turbulence variables. The scaling parameters must only contain numerical values, units or parameters defined under
Global Definitions. The scaling parameters cannot contain variables. The parameters are used when a new default solver for a transient study step is generated. If you change the parameters, the new values take effect the next time you generate a new default solver.