V

Variance of Topology Derivative

Outputs the variance of the topology derivative computed based on the ADAM rule.

Function Name: TopologyDerivativeVariance
Dimensions: [Dimensionless]
Default units: n/a
Type: Scalar
Activated by: Topology Optimization
Requires: Temporary Storage Retained (solver)
Vapor Humidity Value
Partial pressure of water vapor in a mixture to the saturated vapor pressure of the water at the mixture temperature.
Function Name: VaporHumidity
Dimensions: [Dimensionless]
Default units: %
Type: Scalar
Activated by: Thin Film model with Defogging model
Vapor Mass Fraction Diffusion Coefficient
Diffusion of vapor mass fraction in air of the water at the mixture temperature.
Function Name: Vapor Mass Fraction Diffusion Coefficient
Dimensions: [Dimensionless]
Default units: N/A
Type: Scalar
Activated by: Thin Film model with Defogging model
Vapor Mass Fraction Value
Ratio of the vapor mass fraction to the total mass fraction for each cell.
Function Name: VaporMassFraction
Dimensions: [Dimensionless]
Default units: N/A
Type: Scalar
Activated by: Thin Film model with Defogging model
Vapor Supercooling Temperature of [phase interaction]
The vapor temperature below saturation level, in Eqn. (2861).
Function Name: VaporSupercoolingTemperature
Dimensions: [Temperature]
Default units: K
Type: Scalar
Activated by: Dispersed Multiphase (DMP)
Velocity
The velocity vector field.
Function Name: Velocity
Dimensions: [Velocity]
Default units: m/s
Type: Vector
Activated by: Flow models, Harmonic Balance, Viscous Flow
Velocity Divergence Imbalance
The imbalance of volume fluxes, equivalent to the mass imbalance for mass-flux based models. Temporary Storage Retained must be activated for the Segregated MMP solver.
Function Name: DivVelocityImbalance
Dimensions: [Volume/Time]
Default units: m^3/s
Type: Scalar
Activated by: Melting-Solidification, Mixture Multiphase (MMP)
Velocity of [primary phase]
This value is v p in Eqn. (2889).
Function Name: Velocity[primary phase]
Dimensions: [Velocity]
Default units: m/s
Type: Vector
Activated by: Slip Velocity
Velocity of [secondary phase]
This value is v s in Eqn. (2889).
Function Name: Velocity[secondary phase]
Dimensions: [Velocity]
Default units: m/s
Type: Vector
Activated by: Slip Velocity
Velocity of [VofWave Name]
The velocity vector field of a particular VOF wave. This setting can be used for initial conditions and for the velocity specification on boundaries.
Function Name: VelocityWave[n]
Dimensions: [Velocity]
Default units: m/s
Type: Array
Activated by: VOF Waves
Velocity-X Correction
Temporary Storage Retained must be activated in the Segregated Flow solver.
Function Name: U_VelocitySource
Dimensions: [Velocity]
Default units: m/s
Type: Scalar
Activated by: Melting-Solidification
Virtual Disk Source Term of [Virtual Disk]
Shows the distribution of the virtual disk source term per unit volume over the disk. This function is only available when Display Source Term is activated on the virtual disk.
Function Name: VirtualDiskSourceTerm<n>
Dimensions: [Force/Volume]
Default units: N/m3
Type: Array
Activated by: Virtual Disk
Virtual Local Heat Transfer Coefficient
An approximation to the true Local Heat Transfer Coefficient. It does not require an energy model to be activated and is defined as h = ρ C p u * / T + where T + is computed according to the selected wall treatment. Since thermal material properties are not available, the specific heat C p and the molecular and turbulent Prandtl numbers are specified as reference values. The fluid density ρ is obtained locally from the simulation.
Function Name: VirtualLocalHeatTransferCoefficient
Dimensions: [Power/Length2-Temperature]
Default units: J/kg-K
Type: Scalar
Activated by: Wall Treatment models
Viscoelastic Equivalent Viscosity
The ratio I I T I I D = ( t r [ T ] ) 2 t r ( T 2 ) ( t r [ D ] ) 2 t r ( D 2 ) of the second invariants of the stress tensor T and the rate of deformation tensor D , providing an estimate of the shear resistance of the viscoelastic material with respect to the local shear rate in the system. See Eqn. (708) and Eqn. (709). (Viscoelastic)
Function Name: ViscoelasticEquivalentViscosity
Dimensions: [Pressure-Time]
Default units: Pa-seconds
Type: Scalar
Activated by: Viscoelastic
Visualization Cell Status
Displays the standalone boundary to visualize data from a simulation history file.
Function Name: VisCellStatus
Dimensions: [Dimensionless]
Default units: N/A
Type: Scalar
Activated by: Solution History
VOF-Lagrangian Countinuity Source of <phase>
Function Name: VOF-Lagrangian Countinuity Source
Dimensions: [Mass/Time]
Default units: kg/s
Type: Scalar
Activated by:
VOF-Lagrangian Energy Source
Function Name: VofLagrangianEnergySource
Dimensions: [Power]
Default units: W
Type: Scalar
Activated by:
VOF-Lagrangian Momentum Source
Function Name: VofLagrangianMomentumSource
Dimensions: [Force]
Default units: N
Type: Vector
Activated by:
VOF-Lagrangian Stripping Continuity Source of Phase Interaction <n>
Rate of mass transfer from the VOF phase to the Lagrangian phase.
Function Name: VofLagrangianStrippingContinuitySourcePhase Interaction<n>
Dimensions: [Mass/Time]
Default units: kg/s
Type: Scalar
Activated by:
Vof-Lagrangian Stripping Energy Source of Phase Interaction <n>
Rate of energy transfer from the VOF phase to the Lagrangian phase.
Function Name: VofLagrangianStrippingEnergySourcePhase Interaction <n>
Dimensions: Energy/Time
Default units: J
Type: Scalar
Activated by: Lagrangian Multiphase model
Vof-Lagrangian Stripping Momentum Source of Phase Interaction <n>
Rate of momentum transfer from the VOF phase to the Lagrangian phase.
Function Name: VofLagrangianStrippingMomentumSourcePhase Interaction <n>
Dimensions: Force
Default units: N
Type: Array
Activated by: Lagrangian Multiphase model
Vof Accumulated Stripping Mass of Phase Interaction <n>
Function Name: VofAccumulatedStrippingMassPhase Interaction <n>
Dimensions: Mass
Default units: kg
Type: Scalar
Activated by:
VOF Porous Wall Flux of [Phase]
The actual mass flow per unit area through the porous wall (kg/m2s).
Function Name: VOFPorousWallFlux[Phase]
Dimensions: [Mass/Length^2-Time]
Default units: kg/m^2-s
Type: Scalar
Activated by: Wall Porosity
VOF Porous Wall Target Normal Velocity of [Phase[
The target velocity normal to the porous wall v n calculated according to (Eqn. (2641)) and the pressure drop Δ p .

This function is not the actual normal velocity, which is equal to VOF Porous Wall Flux divided by the phase density.

Function Name: VOFPorousWallTargetNormalVelocity[Phase]
Dimensions: [Velocity]
Default units: m/s
Type: Scalar
Activated by: Wall Porosity
Vof Surface Area Density of Phase Interaction <n>
Function Name: VofSurfaceAreaDensityPhase Interaction <n>
Dimensions: /Length
Default units: /m
Type: Scalar
Activated by:
Vof Surface Normal
Function Name: VofSurfaceNormalPhase Interaction <1>
Dimensions: [Dimensionless]
Default units: N/A
Type: Array
Activated by:
VOF Transported Interface Marker

The transported marker I that is determined as I = max ( I D o w n , I U p ) . For more information on this value, see Free Surface Mesh Refinement.

Function Name: VOFTransportedInterfaceMarker
Dimensions: [Dimensionless]
Default units: N/A
Type: Scalar
Activated by: Free Surface Mesh Refinement
Void Fraction
The fraction of the cell volume available to the fluid, unoccupied by a solid or dispersed phase.
Function Name: VoidFraction
Dimensions: [Dimesionless]
Default units: N/A
Type: Scalar
Activated by: Langrangian Multiphase model
Volume
This field function contains the volume of each cell.
Function Name: Volume
Dimensions: [Volume]
Default units: m3
Type: Scalar
Activated by: Space models
Volume Change
This field function describes the ratio of the volume of a cell to that of its largest neighbor. A value of 1.0 indicates that the cell has a volume equal to or higher than its neighbors. A large jump in volume from one cell to another can cause potential inaccuracies and instability in the solvers. Investigate cells with a volume change value of 1e-05 or below as they can be considered suspect.
See Mesh Quality: Volume Change.
Function Name: VolumeChange
Dimensions: [Dimensionless]
Default units: N/A
Type: Scalar
Activated by: Space models
Volume Fraction of <Phase>
The volume of material particles of <phase> per unit volume of space.

For SPH flow, this is the volume of material particles of the [phase] per unit volume of space. For individual particles, this value is 1 for the liquid particles and 0 for gas. On the boundary, the volume fraction of [phase] corresponds to the wetting area of the surface relative to the phase, using interpolation from fluid particles.

Function Name: VolumeFraction[Phase]
Dimensions: [Dimensionless]
Default units: N/A
Type: Scalar
Activated by: VOF Multiphase, Lagrangian Multiphase,Incompressible Flow (ISPH)
Volume Fraction of Heavy Fluid of [VofWave Name]
Volume fraction of heavy fluid (such as water) of a particular VOF wave. This setting can be used for the initial volume fraction and for the volume fraction specification at boundaries.
Function Name: VolumeFractionHeavyFluidWave[n]
Dimensions: [Dimensionless]
Default units: N/A
Type: Scalar
Activated by: VOF Waves
Volume Fraction of Light Fluid of [VofWave Name]
Volume fraction of light fluid (such as air) of a particular VOF wave. This setting can be used for the initial volume fraction and for the volume fraction specification at boundaries.
Function Name: VolumeFractionLightFluidWave[n]
Dimensions: [Dimensionless]
Default units: N/A
Type: Scalar
Activated by: VOF Waves
Vorticity
The vector variable with components ζ x , ζ y , ζ z defined as:

 ζ x = w y v z ,    ζ y = u z w x ,    ζ z = v x u y 

where u , v and w are velocity components in the x, y and z directions.

∇× v is the curl of the velocity field.

Function Name: VorticityVector_name
Dimensions: [/Time]
Default units: /s
Type: Vector
Activated by: Flow models
Vorticity Tensor Modulus
Temporary Storage Retained must be activated in the Segregated Flow solver.
Function Name: Vorticity
Dimensions: [/Time]
Default units: /s
Type: Scalar
Activated by: Flow models
Voxel partition
The partition ID of the voxel mesh, which is used for view factor ray tracing. The voxel mesh has different domain decomposition from the CFD mesh.
Function Name: VoxelPartition
Dimensions: [Dimensionless]
Default units: N/A
Type: Scalar
Activated by: Surface Photon Monte Carlo Radiation, View Factors Calculator, Volumetric Photon Monte Carlo