MMP-MMP Phase Interaction Reference

Table 1. MMP-MMP Phase Interaction Reference
Theory	See Multiple Flow Regimes.
Example Node Path	[phase interaction] > Models > MMP-MMP Phase Interaction
Requires	Physics continuum selections: Material: Multiphase, Multiphase Interaction (Selected automatically) Multiphase Model: Mixture Multiphase (MMP), Segregated Flow (selected automatically), Gradients (selected automatically) The appropriate liquid phase and corresponding vapor phase defined. A phase interaction is required.
Properties	Key properties are: Primary Phase, Secondary Phase, Flow Regime . See MMP-MMP Phase Interaction Properties.
Activates	Physics Models	The following models are available in the Optional Models group box: Multiphase Material Boiling/Condensation Wall Nucleate Boiling Interaction Area Density Interaction Length Scale Spalding Evaporation/Condensation Interphase Reaction S-Gamma Breakup S-Gamma Coalescence Slip Velocity Surface Tension Force
	Model Controls (child nodes)	Flow Regime Weight Function See Flow Regime Weight Function Properties.

MMP-MMP Phase Interaction Properties

The following phase interaction model properties are available:

Primary Phase

The primary phase of the interacting pair of MMP phases.

Secondary Phase

The secondary phase of the interacting pair of MMP phases.

Flow Regime

Specifies the flow regimes in the MMP framework.

The following options are available:

Unrestricted: allows multiple flow regimes (first dispersed regime, second dispersed regime, intermediate regime).
Values such as drag are calculated with a weighted sum of the interaction of each flow topology regime.
The Flow Regime Weight Function child node allows you to specify the blending function for the transition between flow regimes. See Flow Regime Weight Function Properties.
Second Dispersed Regime only: restricts the flow regime to a dispersed primary phase.
First Dispersed Regime only: restricts the flow regime to a dispersed secondary phase.

Flow Regime Weight Function Properties

Values such as drag and heat transfer are calculated with a weighted sum of the interaction of each flow topology regime. You specify the blending function that is used in the transition between flow regimes.

Standard

The default method. The weight function for each flow topology regime is calculated as described in Standard Blending Function.

First Dispersed Regime Terminus: In the first dispersed regime, the primary phase is treated as the continuous phase. The first dispersed regime terminus is the value of the volume fraction of the secondary phase, $α_{s}$ , at which the first dispersed regime transits to the intermediate regime. The default value is 0.3.; The first dispersed regime terminus is the value $α_{f r t}$ that is used in Eqn. (1916).
Second Dispersed Regime Onset: In the second dispersed regime, the secondary phase is treated as the continuous phase. The second dispersed regime onset is the value of $α_{s}$ at which the intermediate regime transits to the second dispersed regime. The default value is 0.7.; The second dispersed regime onset is the value $α_{s r o}$ that is used in Eqn. (1917).
Blending Function Constant: The exponent that controls the width of the transition zone. This value is $B$ in Eqn. (1916) and Eqn. (1917).

Gradient Corrected Standard

A gradient based modification that leads to a smoother field of blending weight function. The weight function for each flow topology regime is calculated as described in Gradient Based Blending Function.

First Dispersed Regime Terminus: The value $α_{f r t}$ that is used in Eqn. (1919).
Second Dispersed Regime Onset: The value $α_{s r o}$ that is used in Eqn. (1920).
Blending Function Constant: The exponent that controls the width of the transition zone. This value is $B$ in Eqn. (1919) and Eqn. (1920).
Gradient Correction Factor: The factor that controls the role of the gradient in the blending function. This value is $c_{g}$ in Eqn. (1919) and Eqn. (1920). The default value is $c_{g} = 0.05$ .

User Specified

You specify the first dispersed regime and second dispersed regime blending weight functions using field functions.

First Dispersed Regime Weight Function: The field function that specifies $W_{f r}$ .
Second Dispersed Regime Weight Function: The field function that specifies $W_{s r}$ .