Viscous Multiphase Model Reference

The Viscous Multiphase model allows the simulation of several distinct and immiscible viscous phases in a single continuum.


Theory	See Viscous Multiphase Flow.
Provided By	[physics continuum] > Models > Multiphase Model
Example Node Path	Continua > Physics 1 > Models > Viscous Multiphase
Requires	Material: Multiphase Optional Models: Multiphase Interaction (selected automatically when Auto-select recommended physics models is activated)
Properties	SUPG The value for the Streamline-Upwind-Petrov-Galerkin advection stabilization term $τ_{SUPG}$ in Eqn. (1040). The default value is 1.0.
Activates	Physics Models	Viscous Regime: Laminar (selected automatically) Flow: Viscous Flow (selected automatically) Viscous Multi-Phase Model: Conservative Level Set (selected automatically) Optional Models: Multiphase Interaction (selected automatically)
	Initial Conditions	Phase Field. See Initial Conditions.
	Boundary Inputs	Phase Field. See Boundary Settings.
	Solvers	MultiPhase Solver. See Solvers.
	Field Functions	Apparent Specific Heat, Apparent Thermal Conductivity, Apparent Viscosity, Phase N. See Field Functions.

Initial Conditions

Phase Field

Specifies the initial phase field for each phase. A value of 1 corresponds to the cell being completely filled with the phase. A value of 0 means that the phase is not present in the cell. The sum of all phase field values must be 1.

Method	Corresponding Value Nodes
Composite	Composite Has a child node for each phase, named after the phases described under the Multiphase model. Specify the phase field for each phase in the Value property of the child node for the phase.
Composite N-1	Composite N-1 Has a child node for N-1 phases in an N-phase system. Each one specifies the phase field value in the Value property of the child node for that particular phase. The value for the unlisted phase is calculated automatically, since the sum of N phase in the system must be equal to one.
Constant	None. Enter the phase field values as an ordered list in the Value property of the Phase Field node.

Boundary Settings

Velocity Inlet

Phase Field

Specifies the phase field for each phase. A value of 1 corresponds to the cell being completely filled with the phase. A value of 0 means that the phase is not present in the cell. The sum of all phase field values must be 1.

Method	Corresponding Value Nodes
Composite	Composite Has a child node for each phase, named after the phases described under the Multiphase model. Specify the phase field for each phase in the Value property of the child node for the phase.
Composite N-1	Composite N-1 Has a child node for N-1 phases in an N-phase system. Each one specifies the phase field value in the Value property of the child node for that particular phase. The value for the unlisted phase is calculated automatically, since the sum of N phase in the system must be equal to one.
Constant	None. Enter the phase field values as an ordered list in the Value property of the Phase Field node.

MultiPhase Solver Properties

Solver Frozen: When On, the solver does not update any quantity during an iteration. It is Off by default. This is a debugging option that can result in non-recoverable errors and wrong solutions due to missing storage. See Finite Volume Solvers Reference for details.
Phase-Field Iterations: The number of sub-steps that each time-step is divided into. To reach better accuracy, stability, and convergence of the level set scheme, each time step is sub-divided into multiple time intervals and then both pure advection and reinitialization stages are solved for these sub-steps. The default is 1.

Field Functions

Apparent Specific Heat: Specific heat of the mixture based on the mass average mixing rule. See Eqn. (1072).
Apparent Thermal Conductivity: Thermal conductivity of the mixture based on the selected mixing rule.
Apparent Viscosity: The viscosity of the mixture based on the selected mixing rule.
[phase field]: The value of the phase field for each Eulerian phase $i = 1, 2, \dots, N$ .