I

Ice Density
Density of the ice layer.
Function Name: IceDensity
Dimensions: [Mass/Volume]
Default units: kg/m3
Type: Scalar
Activated by: Deicing model
Ice LatentHeat
Latent heat due to melting/solidification of the ice layer.
Function Name: IceLatentHeat
Dimensions: [Energy/Mass]
Default units: J/kg
Type: Scalar
Activated by: Deicing model
Ice Layer Thickness Value
Thickness of the ice layer.
Function Name: IceLayerThickness
Dimensions: [Length]
Default units: m
Type: Scalar
Activated by: Deicing model
Ice PhaseChangeTemperature
Function Name: IcePhaseChangeTemperature
Dimensions: [Temperature]
Default units: K
Type: Scalar
Activated by: linked model list
Ice Specific Heat
Specific heat of the ice layer.
Function Name: IceSpecificHeat
Dimensions: [Energy/Mass-Temperature]
Default units: J/kg-K
Type: Scalar
Activated by: Deicing model
IDDES Blending Function
The blending function f ˜ d defined in Eqn. (1422) that is used for detached eddy simulation with the IDDES formulation option.
Function Name: SaTurbDesFd
Dimensions: [Dimensionless]
Default units: N/A
Type: Scalar
Activated by: Spalart-Allmaras Detached Eddy, SST K-Omega Detached Eddy
Requires: Temporary Storage Retained (Spalart-Allmaras Turbulence solver)
IDDES Elevating Function
The elevating function f e defined in Eqn. (1415) that is used for detached eddy simulation with the IDDES formulation option.
Function Name: IddesFe
Dimensions: [Dimensionless]
Default units: N/A
Type: Scalar
Activated by: Spalart-Allmaras Detached Eddy, SST K-Omega Detached Eddy
Requires: Temporary Storage Retained (Spalart-Allmaras Turbulence solver)
IDDES Length Scale
The cell length scale that is used for detached eddy simulation with the IDDES formulation option Δ IDDES , see Eqn. (1424).
Function Name: IddesLengthScale
Dimensions: [Dimensionless]
Default units: N/A
Type: Scalar
Activated by: Spalart-Allmaras Detached Eddy, SST K-Omega Detached Eddy
Ignition Progress Variable
Y i g i in Eqn. (4022).
Function Name: IgnitionProgressVariable
Dimensions: [Dimensionless]
Default units: N/A
Type: Scalar
Activated by: Auto-Ignition models
Impact Wear Rate
The rate at which material is being eroded from a boundary by direct impact. To access this field function, select the Impact Wear model.
Function Name: ImpactWearRate
Dimensions: [Mass/Length^2-Time]
Default units: kg/m^2-s
Type: Scalar
Activated by: Erosion
Impingement Rate of [Eulerian phase]
The rate of impingement from the Lagrangian phase to the Eulerian phase.
Function Name: ImpingementMassTransferRate[eulerian phase]
Dimensions: [Mass/Time]
Default units: kg/s
Type: Scalar
Activated by: Impingement
Incident Mass Flux of <Phase>
The mass flux of material particles of <phase> impinging on a boundary.
Function Name: IncidentMassFlux<Phase>
Dimensions: [Mass/Length^2-Time]
Default units: kg/m^2-s
Type: Scalar
Activated by: Material Particles model
Incident Mass Flux of <Component> of <Phase>
The mass flux of <component> of the material particles of <phase> impinging on a boundary.
Function Name: IncidentMassFlux<Phase><Component>
Dimensions: [Mass/Length^2-Time]
Default units: kg/m^2-s
Type: Scalar
Activated by: Material Particles model
Incident Particle Flux of Phase <Phase>
The rate of massless particles of <phase> impinging on a boundary.
Function Name: IncidentParticleFluxPhase<n>
Dimensions: [/Length2-Time]
Default units: /m2-sec
Type: Scalar
Activated by: Lagrangian Multiphase model, Massless Particles model, Material Particles model
Incident Radiation
The zeroth angular moment of radiative intensity ( G = 4 π I d Ω ). This quantity is also proportionally related to the energy density ( u e = G / c where c is the speed of light) and to the mean intensity ( I ¯ = G / 4 π ). This property is a full-spectrum quantity. For spectral radiation (multiband), it includes contributions from all wavelengths (bands).
Function Name: IncidentRadiation
Dimensions: [Power/Length^2]
Default units: W/m^2
Type: Scalar
Activated by: Participating Media Radiation (DOM) model, Participating Media (Spherical Harmonics), Volumetric Photon Monte Carlo
Incremental Nodal Displacement
Represents the increment of the imported Abaqus displacement over a time-step.
Function Name: code_name
Dimensions: [dimensions]
Default units: units
Type: type
Activated by: Abaqus Co-Simulation
Indicator of [Virtual Disk]
Cell marker to indicate which volume cell is identified as part of the virtual disk. A value of 1 indicates that the cell is part of the virtual disk. A value of 0 indicates that the cell is not part of the virtual disk. This field function can be used as input to a derived part of the type threshold.
Function Name: VirtualDiskMarker<n>
Dimensions: [Dimensionless]
Default units: N/A
Type: Scalar
Activated by: Virtual Disk
Inflow Plane Marker of [Virtual Disk]
Cell marker to indicate which volume cell is identified as part of the inflow velocity plane. A value of 1 indicates that the cell is part of the inflow velocity plane. A value of 0 indicates that the cell is not part of the inflow velocity plane. This field function can be used as input to a derived part of the type threshold.
Function Name: VirtualDiskInflowPlaneMarker<n>
Dimensions: [Dimensionless]
Default units: N/A
Type: Scalar
Activated by: Virtual Disk
Injector Index
The index of the injector which created each parcel.
Function Name: InjectorIndex
Dimensions: [Dimensionless]
Default units: N/A
Type: Scalar
Activated by: Lagrangian Multiphase model, Massless Particles model, Material Particles model
Input Equilibrium Library Temperature
The unburnt temperature that is used to enter the equilibrium library by taking into account heat losses from combustion.
Function Name: Input Equilibrium Library Temperature
Dimensions: [Temperature]
Default units: K
Type: Scalar
Activated by: ECFM-CLEH model
InitialVelocityOfDfbiConstraint 1
Automatically computes the initial relative velocity for the bodies that participate in the constraint with index 1. The computation is based on the initial velocity and angular velocity of these 6-DOF bodies and the direction defined by the driver constraint.

The velocity specified in a velocity driver constraint must be consistent with the initial velocity and angular velocity of the 6-DOF bodies. The same holds for the time derivative of the distance specification of a distance driver constraint.

Function Name: InitialVelocityOfDfbiConstraint 1
Dimensions: [Velocity]
Default units: m/s
Type: Vector
Activated by: DFBI Body Constraints
InitialDistanceOfDfbiConstraint 1
Automatically computes the initial distance for the bodies that participate in the constraint with index 1. Only available for distance driver constraints.
Function Name: InitialDistanceOfDfbiConstraint 1
Dimensions: [Length]
Default units: m
Type: Scalar
Activated by: DFBI Distance Driver
Initiator Concentration
Displays the concentration of the initiator throughout the polymerization process.
Function Name: InitiatorConcentration
Dimensions: [Quantity/Volume]
Default units: kg/m3
Type: Scalar
Activated by: Polymerization model
Integrated IsTransitioning of [phase interaction]
Gives the integrated results for all the defined transition criteria. A value of 1 indicates which VOF blobs will be transitioned to Lagrangian parcels, at any given time-step.
Function Name: IntegratedIsTransitioning[phase interaction]
Dimensions: [Dimensionless]
Default units: N/A
Type: Scalar
Activated by: Resolved VOF-Lagrangian Transition
Integrated TransitionMark of [phase interaction]
Gives the integrated results for all the defined transition criteria. A value of 1 indicates which Lagrangian parcels will transition to an MMP phase at any given time-step.
Function Name: IntegratedTransitionMark[phase interaction]
Dimensions: [Dimensionless]
Default units: N/A
Type: Scalar
Activated by: Subgrid Transition
Intercalation Particle Surface Film Thickness of [porous film phase]
The (average) thickness of the film solid phase h F in Eqn. (4154).
Function Name: IntercalationParticleSurfaceFilmThickness[porousphase]
Dimensions: [Length]
Default units: m
Type: Scalar
Activated by: Subgrid Particle Surface Film
Intercalation Particle Film Resistance Area of [porous particle phase]
The total electrical resistance area of all films growing on the particle R in Eqn. (4155).
Function Name: IntercalationParticleFilmResistance Area[porousphase]
Dimensions: [Electrical Resistance-Length2]
Default units: ohm-m2
Type: Scalar
Activated by: Subgrid Particle Surface Film
Interface Parent Boundary Index
Function Name: InterfaceParentBoundaryIndex
Dimensions: [Dimensionless]
Default units: N/A
Type: Scalar
Activated by:
Interface Parent Face Index
This field function is the offset of the parent face for each direct boundary interface boundary face. Each face on a direct boundary interface boundary is a piece of an intersection of one face from each of the contributing boundaries. This index identifies those faces from the contributing boundaries.
Function Name: InterfaceParent
Dimensions: [Dimensionless]
Default units: N/A
Type: Scalar
Activated by: Volume mesh models
Interface Turbulence Damping Coefficient [Phase Interaction

For K-Omega turbulence, the damping coefficient B in Eqn. (2635).

For K-Epsilon or Reynolds Stress Transport turbulence, the damping coefficient B ˜ in Eqn. (2636).

Function Name: InterfaceTurbulenceDampingCoefficient[Phase Interaction]
Dimensions: [Dimensionless]
Default units: N/A
Type: Scalar
Activated by: Interface Turbulence Damping
Interface Turbulence Damping Source Term

For K-Omega turbulence, the term S ω in Eqn. (2635).

For K-Epsilon or Reynolds Stress Transport turbulence, the term S ϵ in Eqn. (2636).

Available only when temporary storage is activated in the appropriate Turbulence solver.

Function Name: InterfaceTurbulenceDampingTdrSourceTerm[Phase Interaction]
Dimensions: [Mass/Length-Time^4]
Default units: kg/m-s^4
Type: Scalar
Activated by: Interface Turbulence Damping
Interface Area Density of [Eulerian phase]

The interfacial area available for momentum, heat, and mass transfer from the Lagrangian phase to the continuous Eulerian phase through phase interaction.

Function Name: LargeScaleInterfaceAreaDensity[eulerian phase]
Dimensions: [/Length]
Default units: /m
Type: Scalar
Activated by: Impingement
Requires: Temporary Storage Retained (Lagrangian Multiphase solver).
Interface Normal of [Eulerian phase]

The unit normal vector ( α c α c ) pointing away from the Eulerian phase.

Function Name: LargeScaleInterfaceNormal[eulerian phase]
Dimensions: [Dimensionless]
Default units: NA
Type: Array
Activated by: Impingement
Requires: Temporary Storage Retained (Lagrangian Multiphase solver).
Intermittency
The transported variable γ , see Eqn. (1500).
Function Name: Intermittency
Dimensions: [Dimensionless]
Default units: N/A
Type: Scalar
Activated by: Gamma ReTheta Transition, Gamma Transition
InternalForce
Vector field function that represents the internal elastic forces, as defined in Eqn. (4558).
Function Name: InternalForce
Dimensions: [Dimensionless]
Default units: N/A
Type: Vector
Activated by: Solid Stress
Internal Wall Heat Flux Coefficient, A
Internal Wall Heat Flux Coefficient, B
Internal Wall Heat Flux Coefficient, C
Internal Wall Heat Flux Coefficient, D

The internally calculated contributions to the constant coefficients of wall heat flux A , B , C , D .

In a multiphase continuum, versions of these field functions are created for each phase.

See User Wall Heat Flux Coefficient Specification.

Function Name: InternalWallHEatFluxCoefficientA, InternalWallHEatFluxCoefficientB, InternalWallHEatFluxCoefficientC, InternalWallHEatFluxCoefficientD
Dimensions:
  • A — [Power/Length^2]
  • B — [Power/Length^2-Temperature]
  • C — [Power/Length^2-Temperature]
  • D — [Power/Length^2-Temperature^4]
Default units:
  • A — W/m^2
  • B — W/m^2-K
  • C — W/m^2-K
  • D — W/m^2-K^4
Type: Scalar
Activated by: Coupled Energy, Coupled Solid Energy, Segregated Fluid Enthalpy, Segregated Fluid Temperature, Segregated Solid Energy
Intermittency
The transported variable γ , see Eqn. (1550).
Function Name: Intermittency
Dimensions: [Dimensionless]
Default units: N/A
Type: Scalar
Activated by: Gamma Transition
Interphase Transfer Species Source of [reaction component] of [phase interaction]
Refers to the net source term S Y i for species Y i due to the interphase reactions.
See equations Eqn. (3351) and Eqn. (3352).
Function Name: InterphaseReactionSpeciesTransferSource[Reaction Components][Phase Interaction]
Dimensions: [Mass/Time]
Default units: kg/s
Type: Scalar
Activated by: Interphase Reaction model
Interphase Transfer Species Source Jacobian of [reaction component] of [phase interaction]
Refers to the net Jacobian of the source term S Y i for species Y i , defined as S Y i Y i , which represents the derivative of source term S Y i with respect to the mass fraction of species Y i .
Function Name: InterphaseReactionSpeciesTransferSourceJacobian{Reaction Components]{Phase Interaction]
Dimensions: [Mass/Time]
Default units: kg/s
Type: Scalar
Activated by: Interphase Reaction model
Ionic Charge Density
The ionic space charge density, ρ i o n . Scalar function.
Function Name: IonicChargeDensity
Dimensions: [Electric Charge/Volume]
Default units: s-A/m^3
Type: Scalar
Activated by: Electrochemical Species
Isotherm Speed of <Phase> @ <Critical Temperature>
The Isotherm Speed of the melting-solidifying phase at the critical temperature.
Function Name: IsothermSpeed[Phase]_[Critical Temperature]
Dimensions: [Velocity]
Default units: m/s
Type: Array
Activated by: Criteria Functions
Is Stripping
Whether stripping is occurring in a cell during a particular time-step.
Function Name: VofLagrangianIsStripping[Phase Interaction]
Dimensions: [Dimensionless]
Default units: N/A
Type: Scalar
Activated by: VOF-Lagrangian User Stripping model
IsTransitioning of <criterion> of <phase interaction>
This stores the results of each transition criterion decision, for all the phase interactions.
Function Name: IsTransitioning<criterion><phase interaction>
Dimensions: [Dimensionless]
Default units: N/A
Type: Scalar
Activated by: Resolved VOF-Lagrangian Transition
Iteration
Displays the current iteration of the simulation.
Function Name: Iteration
Dimensions: [Dimensionless]
Default units: N/A
Type: Scalar
Activated by: Time Models