D

Damping Boundary Distance

The distance between a cell and the nearest damping boundary (that is, a boundary where the Damping option is activated).

See Wave Damping.


Function Name:	`DampingBoundaryDistance`
Dimensions:	[Length]
Default units:	m
Type:	Scalar
Activated by:	VOF Wave Zone Distance

Damping Source Term

The damping source term is a resistance term that is added to the equation for

w

-velocity. This value is

S_{z}^{d}

in Eqn. (334).


Function Name:	`DampingSourceTerm`
Dimensions:	[Length^2]
Default units:	m^2
Type:	Array
Activated by:	VOF Waves

Damping Strength Indicator

This indicator field function can have values from [0,1] where 1 means maximal impact of damping and 0 means no impact.

This value is $r^{d}$ in Eqn. (336).


Function Name:	`DampingStrengthIndicator`
Dimensions:	[Dimensionless]
Default units:	N/A
Type:	Dimensionless
Activated by:	VOF Waves

[DataMapperName][OperatorName][InputFunctionName]

This field function enables you to visualize the mapped Lagrangian Phase data onto the target regions of the volume mesh.


Function Name:	`[DataMapperName][OperatorName][InputFunctionName]`
Dimensions:	Field Function Dependant
Default units:	Field Function Dependant
Type:	Scalar or Vector
Activated by:	Parcel Data Mapper

[Data Mapper Name][Parcel Count]

This field function gives the number of parcels of the input Lagrangian phases in each cell.


Function Name:	`[DataMapperName][ParcelCount]`
Dimensions:	[Dimensionless]
Default units:	N/A
Type:	Scalar
Activated by:	Parcel Data Mapper

DDES Correction Factor

The correction factor

ϕ

defined in Eqn. (1430).


Function Name:	`SstKwTurbDDesFactor`
Dimensions:	[Dimensionless]
Default units:	N/A
Type:	Scalar
Activated by:	SST (Menter) K-Omega Detached Eddy
Requires:	Temporary Storage Retained (K-Omega Turbulence solver)

Demagnetizing Flux Density

The difference between the current flux density

B

and the knee-point flux density

B_{k}

inside a permanent magnet. See Eqn. (4354).


Function Name:	`DemagnetizingFluxDensity`
Dimensions:	[Force/Length-Current]
Default units:	T
Type:	type
Activated by:	Demagnetization Indication

Density

The density of the material.


Function Name:	`Density`
Dimensions:	[Mass/Volume]
Default units:	kg/m³
Type:	Scalar
Activated by:	Coupled Flow, Harmonic Balance, Segregated Flow, Viscous Flow

Density of [phase]

The density of the Eulerian phase.


Function Name:	`Density[phase]`
Dimensions:	[Mass/Volume]
Default units:	kg/m³
Type:	Scalar
Activated by:	Dispersed Multiphase (DMP), Eulerian Multiphase (EMP), Volume of Fluid (VOF) Multiphase, Mixture Multiphase (MMP)

Density Limiter


Function Name:	`DensityLimiter`
Dimensions:	[Dimensionless]
Default units:	N/A
Type:	Scalar
Activated by:	Melting-Solidification

Density Recon


Function Name:	`DensityRGrad`
Dimensions:	[Mass/Volume-Length]
Default units:	kg/m^4
Type:	Array
Activated by:	Melting-Solidification

DES Low Re Correction Factor

The low Reynolds number correction function

ψ

defined in Eqn. (1411).


Function Name:	`SaTurbDesLowReCorrectionFactor`
Dimensions:	[Dimensionless]
Default units:	N/A
Type:	Scalar
Activated by:	Spalart-Allmaras Detached Eddy, Elliptic Blending K-Epsilon Detached Eddy

DES Upwind Blending Factor

The blending function for the hybrid upwind scheme

σ_{H U}

defined in Eqn. (1450).


Function Name:	`DesUpwindBlendingFactor`
Dimensions:	[Dimensionless]
Default units:	N/A
Type:	Scalar
Activated by:	Spalart-Allmaras Detached Eddy, Elliptic Blending K-Epsilon Detached Eddy, SST K-Omega Detached Eddy

Detached Eddy Length Scale

The cell length scale that is used for detached eddy simulation, see

Δ

in Eqn. (1408) and Eqn. (1424).


Function Name:	`DesLengthScale`
Dimensions:	[Length]
Default units:	m
Type:	Scalar
Activated by:	Spalart-Allmaras Detached Eddy, SST K-Omega Detached Eddy

DeviationDistance.AutomatedMesh

Compares the latest surface that is displayed in the scalar scene to the AutomatedMesh.Remesh description. Displays how far the surface in the scene deviates from the earlier description.


Function Name:	`DeviationDistance.AutomatedMesh`
Dimensions:	[Length]
Default units:	m
Type:	Scalar
Activated by:	Automated Mesh is added to the meshing pipeline

DeviationDistance.Background Mesh


Function Name:	`DeviationDistance.AutomatedMesh`
Dimensions:	[Length]
Default units:	m
Type:	Scalar
Activated by:	Automated Mesh is added to the meshing pipeline

DeviationDistance.ElectronicsSurfaceMeshing


Function Name:	`DeviationDistance.ElectronicsSurfaceMeshing`
Dimensions:	[Length]
Default units:	m
Type:	Scalar
Activated by:

DeviationDistance.Imprint

Compares the latest surface that is displayed in the scalar scene to the imprint description.


Function Name:	`DeviationDistance.Imprint`
Dimensions:	[Length]
Default units:	m
Type:	Scalar
Activated by:	Imprint is added to the meshing pipeline

DeviationDistance.Overset Mesh


Function Name:	`DeviationDistance.CopyofBackgroundMesh`
Dimensions:	[Length]
Default units:	m
Type:	Scalar
Activated by:

DeviationDistance.Root

Compares the latest surface that is displayed in the scalar scene to the root description and displays how far the surface in the scene deviates from the earlier root description.


Function Name:	`DeviationDistance.Root`
Dimensions:	[Length]
Default units:	m
Type:	Scalar
Activated by:	Importing parts, using the surface remesher

DeviationDistance.SurfaceWrapper

Compares the latest surface that is displayed in the scalar scene to the Surface Wrapper.Wrap description.


Function Name:	`DeviationDistance.SurfaceWrapper`
Dimensions:	[Length]
Default units:	m
Type:	Scalar
Activated by:	Surface Wrapper is activated within the mesh pipeline and Per-Part Meshing is activated.

DIFFmode Combustion Heat Release Rate

Heat release rate in the diffusion zone.


Function Name:	`DIFFmode Combustion Heat Release Rate`
Dimensions:	[Energy/Volume-Time]
Default units:	J/m^3-s
Type:	Scalar
Activated by:	ECFM-CLEH

Diffuse Solar Irradiation

The solar flux on the boundary from the surrounding environment. This quantity is only available for gray radiation when the Solar Loads model is activated.


Function Name:	`DiffuseSolarFlux`
Dimensions:	[Power/Length^2]
Default units:	W/m^2
Type:	Scalar
Activated by:	Solar Loads with Gray Thermal Radiation active

Diffuse Solar Irradiation of <band-name>

The solar flux on the boundary from the surrounding environment for band <band-name> which has the Thermal Specification condition set to Environment.


Function Name:	`SpectralDiffuseSolarFlux[N]`
Dimensions:	[Power/Length^2]
Default units:	W/m^2
Type:	Scalar
Activated by:	Solar Loads with Multiband Thermal Radiation already active

Diffuse Solar Irradiation of <band-name> on External Side

The solar flux from the surrounding environment for band <band-name> on the external side of a boundary which has the Thermal Specification condition set to Environment.


Function Name:	`ExternalSpectralDiffuseSolarFlux[N]`
Dimensions:	[Power/Length^2]
Default units:	W/m^2
Type:	Scalar
Activated by:	Solar Loads with Multiband Thermal Radiation already active

Diffuse Solar Irradiation on External Side

The solar flux from the surrounding environment for band <band-name> on the external side of a boundary which has the Thermal Specification condition set to Environment.


Function Name:	`ExternalDiffuseSolarFlux`
Dimensions:	[Power/Length^2]
Default units:	W/m^2
Type:	Scalar
Activated by:	Solar Loads with Gray Thermal Radiation active

Diffusion Coefficient of <passive scalar>_name

Diffusion coefficient of a particular passive scalar material, relating the diffusive transport of the material to the gradient.


Function Name:	`PassiveScalarDiffCoef`
Dimensions:	[Mass/Length-Time]
Default units:	kg/m-s
Type:	Scalar
Activated by:	Passive Scalar

Diffusion Combustion Progress Variable

\tilde{α}

in Eqn. (3874).


Function Name:	`Diffusion Combustion Progress Variable`
Dimensions:	[Dimensionless]
Default units:	N/A
Type:	Scalar
Activated by:	ECFM-CLEH

Diffusion Current Density

The second term in Eqn. (4077).


Function Name:	`ElectrochemicalSpeciesElectricCurrentContribution`
Dimensions:	[Current/Length^2]
Default units:	A/m^2
Type:	Array
Activated by:	Electrochemical Species

Diffusivity of <passive scalar>


Function Name:	`Passive ScalarDiffusivity`
Dimensions:	[Length²/Time]
Default units:	m²/s
Type:	Scalar
Activated by:	Passive Scalar

Dimensionless Niyama of <Phase> @ <Critical Temperature>

The Dimensionless Niyama Criterion of the melting-solidifying phase at the critical temperature and the solidus temperature.


Function Name:	`DimensionlessNiyama<Phase)_<CriticalTemperature>`
Dimensions:	[Dimensionless]
Default units:	N/A
Type:	Scalar
Activated by:	Criteria Functions

Direct Directional Incident Radiation

The direct contribution of user-specified directional sources towards incident radiation in a cell.


Function Name:	`DirectDirectionalIncidentRadiation`
Dimensions:	Dimensionless
Default units:	n/a
Type:	Scalar
Activated by:	Gray Thermal Radiation.
Requires:	Volumentric Photon Monte Carlo

Direct Directional Incident Radiation of <band-name>

The direct contribution of user-specified directional sources towards incident radiation in a cell for the band <band-name>.


Function Name:	`SpectralDirectDirectionalIncidentRadiation<band-name>`
Dimensions:	Dimensionless
Default units:	n/a
Type:	Scalar
Activated by:	Multiband Thermal Radiation
Requires:	Volumentric Photon Monte Carlo

Direct Irradiation from Directional Fluxes

The direct flux on the boundary from user-specified directional sources.


Function Name:	`DirectDirectionalFlux`
Dimensions:	[Power/Length²]
Default units:	W/m²
Type:	Scalar
Activated by:	Gray Thermal Radiation

Direct Irradiation from Directional Fluxes of <band-name>

The direct flux on the boundary for <band-name> from user-specified directional sources.


Function Name:	`SpectralDirectDirectionalFlux<n>`
Dimensions:	[Power/Length²]
Default units:	W/m²
Type:	Scalar
Activated by:	Multiband Thermal Radiation

Direct Irradiation from Directional Fluxes of <band-name> on External Side

The direct flux on the external side of the boundary for <band-name> from user-specified directional sources.


Function Name:	`ExternalSpectralDirectDirectionalFlux<n>`
Dimensions:	[Power/Length²]
Default units:	W/m²
Type:	Scalar
Activated by:	Multiband Thermal Radiation

Direct Irradiation from Directional Fluxes On External Side

The direct flux on the external side of the boundary from user-specified directional sources.


Function Name:	`ExternalDirectDirectionalFlux`
Dimensions:	[Power/Length²]
Default units:	W/m²
Type:	Scalar
Activated by:	Gray Thermal Radiation

Direct Solar Incident Radiation

The contribution of direct solar loads towards incident radiation in a cell. This quantity is only available when the Solar Loads model is activated along with gray thermal radiation and Volumetric PMC model.


Function Name:	`DirectSolarIncidentRadiation`
Dimensions:	Dimensionless
Default units:	n/a
Type:	Scalar
Activated by:	Solar Loads
Requires:	Gray Thermal Radiation, Volumetric Photon Monte Carlo

Direct Solar Incident Radiation of <band-name>

The contribution of direct solar loads towards incident radiation in a cell for the band <band-name>. This quantity is only available when the Solar Loads model is activated along with multiband thermal radiation and Volumetric PMC model.


Function Name:	`SpectralDirectSolarIncidentRadiation<band-name>`
Dimensions:	Dimensionless
Default units:	n/a
Type:	Scalar
Activated by:	Solar Loads
Requires:	Multiband Thermal Radiation, Volumetric Photon Monte Carlo

Direct Solar Irradiation

The direct solar flux on the boundary. This quantity is only available for gray radiation when the Solar Loads model is activated.


Function Name:	`DirectSolarFlux`
Dimensions:	[Power/Length^2]
Default units:	W/m^2
Type:	Scalar
Activated by:	Solar Loads with the Gray Thermal Radiation active

Direct Solar Irradiation of <band-name>

The direct solar flux on the boundary for band <band-name>. This quantity is only available for spectral radiation (multiband) when the Solar Loads model is activated.


Function Name:	`SpectralDirectSolarFlux[N]`
Dimensions:	[Power/Length^2]
Default units:	W/m^2
Type:	Scalar
Activated by:	Solar Loads with the Multiband Thermal Radiation already active

Direct Solar Irradiation of <band-name> on External Side

The direct solar flux on the external side of the boundary for band <band-name>. This quantity is only available for spectral radiation (multiband) when the Solar Loads model is activated.


Function Name:	`ExternalSpectralDirectSolarFlux[N]`
Dimensions:	[Power/Length^2]
Default units:	W/m^2
Type:	Scalar
Activated by:	Solar Loads with the Multiband Thermal Radiation already active

Direct Solar Irradiation on External Side

The direct solar flux on the external side of the boundary. This quantity is only available for gray radiation when the Solar Loads model is activated.


Function Name:	`ExternalSirectSolarFlux`
Dimensions:	[Power/Length^2]
Default units:	W/m^2
Type:	Scalar
Activated by:	Solar Loads with the Gray Thermal Radiation active

Discrete Contact Gap

For Mortar discretization of a rigid contact, represents the average contact gap from the projection of the continuous contact gap to the finite element nodes (

{\hat{g}}_{i}

in Eqn. (4500)).

The discrete contact gap field function is available on:

All Rigid Contact segments.
Solid boundaries with at least one Rigid Contact segment specified on the region. The part surfaces of the boundary do not need to be assigned to a Rigid Contact segment.
Any solid region with at least one Rigid Contact segment specified.

For regions, the discrete contact gap is equal to the minimum discrete contact gap defined by the part surfaces that form the Rigid Contact segments.


Function Name:	`DiscreteContactGap`
Dimensions:	[Length]
Default units:	m
Type:	Scalar
Activated by:	Solid Stress

Discrete Quadrature Breakup Rate of [phase interaction]

The breakup rate

G (a)

, as described in Laminar and Turbulent Breakup Models.


Function Name:	`DiscreteQuadrantBreakupRate[phaseinteraction]`
Dimensions:	[/Length^3-Time]
Default units:	/m^3-s
Type:	Scalar
Activated by:	S-Gamma Breakup, S-Gamma Breakup, S-Gamma Breakup with Interaction Source Storage Retained On in the S-gamma solver

Discrete Quadrature Coalescence Rate of [phase interaction]

The coalescence rate is the product of the collision rate and the coalescence efficiency, as described in Coalescence Models.


Function Name:	`DiscreteQuadratureCoalescenceRate[phaseinteraction]`
Dimensions:	[/Length^3-Time]
Default units:	/m^3-s
Type:	Scalar
Activated by:	S-Gamma Coalescence, S-Gamma Coalescence, S-Gamma Coalescence with Interaction Source Storage Retained On in the S-gamma solver

Dispersed Phase Fraction of [phase]

The dispersed phase fraction is the ratio of volume of phase which is dispersed to the volume of total phase in a cell,

k_{p h a s e} = \frac{α_{p h a s e, d i s p e r s e d}}{α_{p h a s e}}

. The values range from 0 to 1.


Function Name:	`DispersedPhaseFraction[phase]`
Dimensions:	Dimensionless
Default units:	N/A
Type:	Scalar
Activated by:	S-Gamma Entrainment , S-Gamma Entrainment

Displacement

Vector field function that represents the displacement

u

in Eqn. (4426).


Function Name:	`Displacement`
Dimensions:	[Length]
Default units:	m
Type:	Vector
Activated by:	Harmonic Balance, Solid Stress

Displacement Electric Current Density

In dielectric media, corresponds to the time rate of change of the electric flux density (that is,

\partial D / \partial t

) due to the motion of dielectric dipoles under the influence of the electric field. Only available for unsteady (transient) simulations.


Function Name:	`DisplacementElectricCurrentDensity`
Dimensions:	[Current/Length^2]
Default units:	A/m^2
Type:	Vector
Activated by:	Electrostatic Potential

d(rho)/d(p)


Function Name:	`DensityP`
Dimensions:	[Time^2/Length^2]
Default units:	s^2/m^2
Type:	Scalar
Activated by:	Melting-Solidification

DRI Cell Contact Index


Function Name:	`DRICellContactIndex`
Dimensions:	[Dimensionless]
Default units:	N/A
Type:	Scalar
Activated by:

Droplet Dynamic Viscosity

The dynamic viscosity of the droplet material,

μ_{l}


Function Name:	`DropletDynamicViscosity`
Dimensions:	[Pressure-Time]
Default units:	Pa-s
Type:	Scalar
Activated by:	TAB Distortion, KHRT breakup, Primary Atomization, Droplet Flash-Boiling

Droplet Growth Rate of [phase interaction]

The droplet growth rate,

\dot{m_{d}}

in Eqn. (2867).


Function Name:	`DropletGrowthRate[phaseinteraction]`
Dimensions:	[Mass/Volume-Time]
Default units:	kg/m³-s
Type:	Scalar
Activated by:	Dispersed Multiphase (DMP)

Droplet Nucleation Rate of [phase interaction]

The droplet nucleation rate,

J

in Eqn. (2865).


Function Name:	`DropletNucleationRate[phaseinteraction]`
Dimensions:	[/Volume-Time]
Default units:	/m³-s
Type:	Scalar
Activated by:	Dispersed Multiphase (DMP)

Droplet Nucleus Diameter of [phase interaction]

The critical droplet diameter, as

2 r^{*}

from Eqn. (2863)


Function Name:	`DropletNucleusDiameter[phaseinteraction]`
Dimensions:	[Length]
Default units:	m
Type:	Scalar
Activated by:	Dispersed Multiphase (DMP)

Droplet Latent Heat of Vaporization

The latent heat of vaporization of the droplet material,

L


Function Name:	`DropletVapourizationLatentHeat`
Dimensions:	[Energy/Mass]
Default units:	J/kg
Type:	Scalar
Activated by:	Droplet Evaporation

Droplet Saturation Pressure

The absolute saturation pressure of the droplet material,

p_{s a t}


Function Name:	`DropletSaturationPressure`
Dimensions:	[Pressure]
Default units:	Pa
Type:	Scalar
Activated by:	Droplet Evaporation

Droplet Surface Tension

The surface tension of the droplet material,

σ


Function Name:	`DropletSurfaceTension`
Dimensions:	[Force/Length]
Default units:	N/m
Type:	Scalar
Activated by:	TAB Distortion, Secondary breakup, Primary Atomization, NTC Collision

Droplet Weber Number

The droplet Weber number, Eqn. (3147).


Function Name:	`DropletWeberNumber`
Dimensions:	[Dimensionless]
Default units:	N/A
Type:	Scalar
Activated by:	Secondary breakup

Dynamic Viscosity

The fluid dynamic viscosity.


Function Name:	`DynamicViscosity`
Dimensions:	[Pressure-Time]
Default units:	Pa-s
Type:	Scalar
Activated by:	Laminar, Turbulent

Dynamic Viscosity of [phase]

The dynamic viscosity of the Eulerian phase.


Function Name:	`DynamicViscosity[phase]`
Dimensions:	[Pressure-Time]
Default units:	Pa-s
Type:	Scalar
Activated by:	Dispersed Multiphase (DMP), Eulerian Multiphase (EMP), Volume of Fluid (VOF) Multiphase, Mixture Multiphase (MMP)