Interaction Area Density Model Reference

The interaction area density specifies the interfacial area available for drag, heat, and mass transfer between each pair of phases in an interaction.

Table 1. Interaction Area Density Model Reference
Theory	See Interaction Area Density.
Provided By	[phase interaction] > Models > Optional Models
Example Node Path	[phase interaction] > Models > Interaction Area Density
Requires	Physics continuum selections: Material: Multiphase Multiphase Model: Eulerian Multiphase (EMP) or Volume of Fluid (VOF) (Automatically activates: Multiphase Interaction, Gradients.) Two Eulerian phases are required. A Continuous-Dispersed Topology, Multiple Flow Regime Topology, or VOF-VOF Phase Interaction phase interaction is required. Phase interaction selections: Optional Models: Interaction Area Density (selected automatically for Continuous-Dispersed phase interaction and Multiple Flow Regime phase interaction.)
Properties	Key properties are: Method. See Interaction Area Density Properties. In a VOF-VOF Phase Interaction, this model has no properties.
Activates	Model Controls	For a Continuous-Dispersed phase interaction only: Interaction Area Density For a Multiple Flow Regime phase interaction only: First Dispersed Regime Interaction Area Density Second Dispersed Regime Interaction Area Density See Interaction Area Density Properties. In a VOF-VOF Phase Interaction, this model has no model controls.
	Field Functions	See Field Functions.

Interaction Area Density Properties

Method

Specifies the method for defining the interaction area density.

Field Function
Spherical Particle
Defines the interaction area density using the surface area of a spherical particle, from Eqn. (1923). This model is not applicable at high particle volume fractions.
Symmetric
Uses the availability of the continuous phase to modify the interaction area density, from Eqn. (1924). This model can be used for a wide range of volume fractions.
This is the default interaction area density method for a Continuous-Dispersed phase interaction, First Dispersed Regime and Second Dispersed Regime multiple flow regime interaction.

Field Functions

The following field function is available for a Continuous-Dispersed phase interaction and a VOF-VOF Phase Interaction:

Interaction Area Density of [phase interaction]: The interfacial area available for momentum, heat, and mass transfer between the two phases in the phase interaction.

The following field functions are available for a Multiple Flow Regime phase interaction:

First Dispersed Regime Interaction Area Density of [phase interaction]: The interaction area density $a_{c d}$ between the continuous primary phase and the dispersed secondary phase.
Intermediate Regime Interaction Area Density of [phase interaction]: The interfacial area available for momentum, heat, and mass transfer between the primary phase and secondary phase. The two phases can be modeled as separated or blended. Simcenter STAR-CCM+ calculates this value automatically.
Second Dispersed Regime Interaction Area Density of [phase interaction]: The interaction area density $a_{c d}$ between the continuous secondary phase and the dispersed primary phase.