This section is referenced in the following other sections

- Simulation Setup: Mass Flux

# 7.12.4. Mass Flux Boundary Condition On Surface

Scope

  Fuego Region

Summary

  Defines a boundary condition with a specified mass flux on a named surface of the mesh.

Description

  The user can specify a mass flow rate either into or out of the domain. The mass flux should obey the sign convention: positive for flux OUT OF the domain, negative for flux INTO the domain. The specified quantity is the total flow rate through the surface, in units of mass per time (note that this is not mass flow per area). When flow is out of the domain (positive mass flux), no variables other than the mass flux need to be specified. When flow into the domain (negative mass flux), the user must provide all of the variables needed for an inflow boundary condition, including (for turbulent flow) the quantities “turbulence_intensity” and “characteristic_length”. The variables provided by the user are used to compute the state of the incoming fluid (e.g. enthalpy). In addition, by computing the density at the specified state, the velocity at the inlet can be computed (since mass flux is the product of density, velocity and area). This velocity is assumed to be in the direction normal to the inlet surface. Any other velocity specified by the user is ignored.

    begin Mass Flux Boundary Condition On Surface Surfacename

        {contact_angle | edc_product | gas_volume_fraction | mixture_fraction | pressure | progress_variable | scalar_variance | second_mixture_fraction | solid_volume_fraction | soot_mass_fraction | soot_nuclei_mass_fraction | temperature | turbulent_dissipation | turbulent_frequency | turbulent_helmholtz_function | turbulent_kinetic_energy | turbulent_v2 | volume_of_fluid | x_solid_velocity | x_velocity | y_solid_velocity | y_velocity | z_solid_velocity | z_velocity} {=} Value

       Characteristic_Length {=} Characteristic length

       Emissivity Spectral File Name {=} Name

       External Field For VariableName [{of} Species] {=} ExtFieldName [ Of Size Value With Multiplier {=} Multiplier  ]

       Emissivity {=} value

       Enthalpy {=} value

       Function For {contact_angle | edc_product | gas_volume_fraction | mixture_fraction | pressure | progress_variable | scalar_variance | second_mixture_fraction | solid_volume_fraction | soot_mass_fraction | soot_nuclei_mass_fraction | temperature | turbulent_dissipation | turbulent_frequency | turbulent_helmholtz_function | turbulent_kinetic_energy | turbulent_v2 | volume_of_fluid | x_solid_velocity | x_velocity | y_solid_velocity | y_velocity | z_solid_velocity | z_velocity} {=} FuncName [ In The {t | x | y | z} Direction  ]

       Function For Emissivity {=} functionName [ In The {t | x | y | z} Direction  ]

       Function For Mass_Fraction {=} FuncName In The {t | x | y | z} Direction

       Function For Mole_Fraction {=} FuncName In The {t | x | y | z} Direction

       Function For Radiation Boundary Temperature {=} functionName

       Function For Radiation Environment Temperature {=} functionName

       Function For Transmissivity {=} functionName [ In The {t | x | y | z} Direction  ]

       Function For Transparent Band Emissivity {=} functionName [ In The {t | x | y | z} Direction  ]

       Include Condensed Phase Convection

       Inline Function For {contact_angle | edc_product | gas_volume_fraction | mixture_fraction | pressure | progress_variable | scalar_variance | second_mixture_fraction | solid_volume_fraction | soot_mass_fraction | soot_nuclei_mass_fraction | temperature | turbulent_dissipation | turbulent_frequency | turbulent_helmholtz_function | turbulent_kinetic_energy | turbulent_v2 | volume_of_fluid | x_solid_velocity | x_velocity | y_solid_velocity | y_velocity | z_solid_velocity | z_velocity} {=} FuncStr

       Integer Data For Subroutine SubName {=} Values...

       Mass Flux {=} Mass_flux

       Mass_Fraction Species {=} Mass fraction

       Mole_Fraction Species {=} Mole fraction

       Porosity Field {=} porosity_field_name

       Porous Condensed Temperature Field {=} porous_condensed_temp_field_name

       Porous Flux Field For {conserved_enthalpy | continuity | edc_product | enthalpy | mixture_fraction | nuclei | progress_variable | scalar_variance | second_mixture_fraction | solid_volume_fraction | soot | species | temperature | turbulent_dissipation | turbulent_frequency | turbulent_helmholtz_function | turbulent_kinetic_energy | turbulent_v2 | volume_of_fluid | x_momentum | x_solid_momentum | y_momentum | y_solid_momentum | z_momentum | z_solid_momentum} [{of} Species] {=} porous_flux_field_name

       Porous Penalty Field For {conserved_enthalpy | continuity | edc_product | enthalpy | mixture_fraction | nuclei | progress_variable | scalar_variance | second_mixture_fraction | solid_volume_fraction | soot | species | temperature | turbulent_dissipation | turbulent_frequency | turbulent_helmholtz_function | turbulent_kinetic_energy | turbulent_v2 | volume_of_fluid | x_momentum | x_solid_momentum | y_momentum | y_solid_momentum | z_momentum | z_solid_momentum} [{of} Species] {=} porous_penalty_field_name

       Porous Target Value Field For {conserved_enthalpy | continuity | edc_product | enthalpy | mixture_fraction | nuclei | progress_variable | scalar_variance | second_mixture_fraction | solid_volume_fraction | soot | species | temperature | turbulent_dissipation | turbulent_frequency | turbulent_helmholtz_function | turbulent_kinetic_energy | turbulent_v2 | volume_of_fluid | x_momentum | x_solid_momentum | y_momentum | y_solid_momentum | z_momentum | z_solid_momentum} [{of} Species] {=} porous_target_field_name

       Porous Volumetric Heat Transfer Coefficient {=} porous_vol_xfer_field_name

       Post Process Delta Area

       Post Process Delta Mass Flow Rate

       Post Process Delta Pressure

       Post Process Delta Thrust

       Postprocess FluxType Flux Of {conserved_enthalpy | continuity | edc_product | enthalpy | mixture_fraction | nuclei | progress_variable | scalar_variance | second_mixture_fraction | solid_volume_fraction | soot | species | temperature | turbulent_dissipation | turbulent_frequency | turbulent_helmholtz_function | turbulent_kinetic_energy | turbulent_v2 | volume_of_fluid | x_momentum | x_solid_momentum | y_momentum | y_solid_momentum | z_momentum | z_solid_momentum} [ As aliases...  ]

       Progress_Variable ProgressVariableName {=} Value

       Real Data For Subroutine SubName {=} Values...

       Radiation Boundary Temperature {=} value

       Radiation Boundary Temperature Field {=} FieldName

       Radiation Environment Temperature {=} value

       Radiation Environment Temperature Field {=} FieldName

       Specific Surface Area Field {=} ssa_field_name

       Subroutine For {contact_angle | edc_product | gas_volume_fraction | mixture_fraction | pressure | progress_variable | scalar_variance | second_mixture_fraction | solid_volume_fraction | soot_mass_fraction | soot_nuclei_mass_fraction | temperature | turbulent_dissipation | turbulent_frequency | turbulent_helmholtz_function | turbulent_kinetic_energy | turbulent_v2 | volume_of_fluid | x_solid_velocity | x_velocity | y_solid_velocity | y_velocity | z_solid_velocity | z_velocity} {=} Subroutine

       Subroutine For Emissivity {=} subroutineName

       Subroutine For Mass_Fraction {=} Subroutine

       Subroutine For Mole_Fraction {=} Subroutine

       Subroutine For Radiation Boundary Temperature {=} subroutineName

       Subroutine For Radiation Environment Temperature {=} subroutineName

       Subroutine For Transmissivity {=} subroutineName

       Subroutine For Transparent Band Emissivity {=} subroutineName

       Transparent Band Emissivity {=} value

       Transmissivity {=} value

       Turbulence_Intensity {=} Turbulent intensity

       Use Porous Coupling For {conserved_enthalpy | continuity | edc_product | enthalpy | mixture_fraction | nuclei | progress_variable | scalar_variance | second_mixture_fraction | solid_volume_fraction | soot | species | temperature | turbulent_dissipation | turbulent_frequency | turbulent_helmholtz_function | turbulent_kinetic_energy | turbulent_v2 | volume_of_fluid | x_momentum | x_solid_momentum | y_momentum | y_solid_momentum | z_momentum | z_solid_momentum}

    end Mass Flux Boundary Condition On Surface Surfacename

## 7.12.4.1. Line Commands

###### Primitivevariable

Syntax

  Primitivevariable {contact_angle | edc_product | gas_volume_fraction | mixture_fraction | pressure | progress_variable | scalar_variance | second_mixture_fraction | solid_volume_fraction | soot_mass_fraction | soot_nuclei_mass_fraction | temperature | turbulent_dissipation | turbulent_frequency | turbulent_helmholtz_function | turbulent_kinetic_energy | turbulent_v2 | volume_of_fluid | x_solid_velocity | x_velocity | y_solid_velocity | y_velocity | z_solid_velocity | z_velocity} {=} Value

Summary

  Value for the specified variable (in consistent units). Value can be a constant or a string function of position (x,y,z), time (t), and any global variable.

  The function string must be enclosed in quotes if it has spaces or commas. For example: x_velocity = “min(1, 0.1*t)”

Parameter | Value | Default
--- | --- | ---
PrimitiveVariable | {contact_angle | edc_product | gas_volume_fraction | mixture_fraction | pressure | progress_variable | scalar_variance | second_mixture_fraction | solid_volume_fraction | soot_mass_fraction | soot_nuclei_mass_fraction | temperature | turbulent_dissipation | turbulent_frequency | turbulent_helmholtz_function | turbulent_kinetic_energy | turbulent_v2 | volume_of_fluid | x_solid_velocity | x_velocity | y_solid_velocity | y_velocity | z_solid_velocity | z_velocity} | –
{=} | {= | are | is} | –
Value | “string” | –

###### Characteristic_Length

Syntax

  Characteristic_Length {=} Characteristic length

Summary

  Specify characteristic length for possible entrainment on open pressure specified boundary.

Parameter | Value | Default
--- | --- | ---
{=} | {= | are | is} | –
Characteristic length | real | 1.0

###### Emissivity Spectral File Name

Syntax

  Emissivity Spectral File Name {=} Name

Summary

  Specify the file name for defining spectral radiation properties on a surface.

Parameter | Value | Default
--- | --- | ---
{=} | {= | are | is} | –
Name | string | –

###### External Field For

Syntax

  External Field For VariableName [{of} Species] {=} ExtFieldName [ Of Size Value With Multiplier {=} Multiplier ]

Summary

  Name of the field that is to be transferred in. For species equation, specify variable as “mass fraction of” followed by the species name for transfers associated with separated individual species field names.

Parameter | Value | Default
--- | --- | ---
VariableName | string | –
Species | string | –
{=} | {= | are | is} | –
ExtFieldName | string | –

###### Emissivity

Syntax

  Emissivity {=} value

Summary

  Constant value for emissivity variable.

Parameter | Value | Default
--- | --- | ---
{=} | {= | are | is} | –
value | “string” | –

###### Enthalpy

Syntax

  Enthalpy {=} value

Summary

  Value for inflowing enthalpy on mass flux BC.

Description

  Value for inflowing enthalpy on mass flux BC. Normally it is best to specify temperature and let Fuego calculate enthalpy, but when coupling mass BCs together it is more natural and less error prone to specify enthalpy directly. The value can be either a constant or a string function of time and global variables.

Parameter | Value | Default
--- | --- | ---
{=} | {= | are | is} | –
value | “string” | –

###### Function For

Syntax

  Function For {contact_angle | edc_product | gas_volume_fraction | mixture_fraction | pressure | progress_variable | scalar_variance | second_mixture_fraction | solid_volume_fraction | soot_mass_fraction | soot_nuclei_mass_fraction | temperature | turbulent_dissipation | turbulent_frequency | turbulent_helmholtz_function | turbulent_kinetic_energy | turbulent_v2 | volume_of_fluid | x_solid_velocity | x_velocity | y_solid_velocity | y_velocity | z_solid_velocity | z_velocity} {=} FuncName [ In The {t | x | y | z} Direction ]

Summary

  Name of function to use for the given variable, in the specified direction.

Parameter | Value | Default
--- | --- | ---
PrimitiveVariable | {contact_angle | edc_product | gas_volume_fraction | mixture_fraction | pressure | progress_variable | scalar_variance | second_mixture_fraction | solid_volume_fraction | soot_mass_fraction | soot_nuclei_mass_fraction | temperature | turbulent_dissipation | turbulent_frequency | turbulent_helmholtz_function | turbulent_kinetic_energy | turbulent_v2 | volume_of_fluid | x_solid_velocity | x_velocity | y_solid_velocity | y_velocity | z_solid_velocity | z_velocity} | –
{=} | {= | are | is} | –
FuncName | string | –

###### Function For Emissivity

Syntax

  Function For Emissivity {=} functionName [ In The {t | x | y | z} Direction ]

Summary

  Name of the function to use for the emissivity in the given direction (default direction = time).

Parameter | Value | Default
--- | --- | ---
{=} | {= | are | is} | –
functionName | string | –

###### Function For Mass_Fraction

Syntax

  Function For Mass_Fraction {=} FuncName In The {t | x | y | z} Direction

Summary

  Name of the mass fraction function to use for all species in the given direction. Note that this must be a Multicolumn function

Parameter | Value | Default
--- | --- | ---
{=} | {= | are | is} | –
FuncName | string | –
Direction | {t | x | y | z} | –

###### Function For Mole_Fraction

Syntax

  Function For Mole_Fraction {=} FuncName In The {t | x | y | z} Direction

Summary

  Name of the mass fraction function to use for all species in the given direction. Note that this must be a Multicolumn function

Parameter | Value | Default
--- | --- | ---
{=} | {= | are | is} | –
FuncName | string | –
Direction | {t | x | y | z} | –

###### Function For Radiation Boundary Temperature

Syntax

  Function For Radiation Boundary Temperature {=} functionName

Summary

  Name of function to use for the radiation_boundary_temperature variable

Parameter | Value | Default
--- | --- | ---
{=} | {= | are | is} | –
functionName | string | –

###### Function For Radiation Environment Temperature

Syntax

  Function For Radiation Environment Temperature {=} functionName

Summary

  Name of function to use for the radiation_environment_temperature variable

Parameter | Value | Default
--- | --- | ---
{=} | {= | are | is} | –
functionName | string | –

###### Function For Transmissivity

Syntax

  Function For Transmissivity {=} functionName [ In The {t | x | y | z} Direction ]

Summary

  Name of function to use for the transmissivity variable

Parameter | Value | Default
--- | --- | ---
{=} | {= | are | is} | –
functionName | string | –

###### Function For Transparent Band Emissivity

Syntax

  Function For Transparent Band Emissivity {=} functionName [ In The {t | x | y | z} Direction ]

Summary

  Name of function to use for the transparent emissivity band for spectral emissivity on surfaces.

Parameter | Value | Default
--- | --- | ---
{=} | {= | are | is} | –
functionName | string | –

###### Include Condensed Phase Convection

Syntax

  Include Condensed Phase Convection

Summary

  Include condensed phase convection contribution to enthalpy flux. Requires specifying condensed temperature, porosity, and volumetric heat transfer coefficient fields that are transferred from the porous region.

###### Inline Function For

Syntax

  Inline Function For {contact_angle | edc_product | gas_volume_fraction | mixture_fraction | pressure | progress_variable | scalar_variance | second_mixture_fraction | solid_volume_fraction | soot_mass_fraction | soot_nuclei_mass_fraction | temperature | turbulent_dissipation | turbulent_frequency | turbulent_helmholtz_function | turbulent_kinetic_energy | turbulent_v2 | volume_of_fluid | x_solid_velocity | x_velocity | y_solid_velocity | y_velocity | z_solid_velocity | z_velocity} {=} FuncStr

Summary

  warning{This command is deprecated. Regular BCs now support using string functions directly}

Parameter | Value | Default
--- | --- | ---
PrimitiveVariable | {contact_angle | edc_product | gas_volume_fraction | mixture_fraction | pressure | progress_variable | scalar_variance | second_mixture_fraction | solid_volume_fraction | soot_mass_fraction | soot_nuclei_mass_fraction | temperature | turbulent_dissipation | turbulent_frequency | turbulent_helmholtz_function | turbulent_kinetic_energy | turbulent_v2 | volume_of_fluid | x_solid_velocity | x_velocity | y_solid_velocity | y_velocity | z_solid_velocity | z_velocity} | –
{=} | {= | are | is} | –
FuncStr | “string” | –

###### Integer Data For Subroutine

Syntax

  Integer Data For Subroutine SubName {=} Values…

Summary

  List of integer data values to be passed down in to the user subroutine. These values may be changed by the user subroutine.

Parameter | Value | Default
--- | --- | ---
SubName | string | –
{=} | {= | are | is} | –
Values | integer… | –

###### Mass Flux

Syntax

  Mass Flux {=} Mass_flux

Summary

  Value for the specified mass flux in consistent units. The value can be a constant or a function of time and global variables.

Parameter | Value | Default
--- | --- | ---
{=} | {= | are | is} | –
Mass_flux | “string” | –

###### Mass_Fraction

Syntax

  Mass_Fraction Species {=} Mass fraction

Summary

  Value for the mass fraction of selected species. Can be a constant value or a string function of space (x,y,z), time (t), and any global variable.

Parameter | Value | Default
--- | --- | ---
Species | string | –
{=} | {= | are | is} | –
Mass fraction | “string” | –

###### Mole_Fraction

Syntax

  Mole_Fraction Species {=} Mole fraction

Summary

  Value for the mole fraction of selected species. Can be a constant value or a string function of space (x,y,z), time (t), and any global variable.

Parameter | Value | Default
--- | --- | ---
Species | string | –
{=} | {= | are | is} | –
Mole fraction | “string” | –

###### Porosity Field

Syntax

  Porosity Field {=} porosity_field_name

Summary

  Specify name of the external field containing the porosity transferred from the porous region.

Parameter | Value | Default
--- | --- | ---
{=} | {= | are | is} | –
porosity_field_name | string | –

###### Porous Condensed Temperature Field

Syntax

  Porous Condensed Temperature Field {=} porous_condensed_temp_field_name

Summary

  Specify name of the external field containing the condensed phase temperature transferred from the porous region.

Parameter | Value | Default
--- | --- | ---
{=} | {= | are | is} | –
porous_condensed_temp_field_name | string | –

###### Porous Flux Field For

Syntax

  Porous Flux Field For {conserved_enthalpy | continuity | edc_product | enthalpy | mixture_fraction | nuclei | progress_variable | scalar_variance | second_mixture_fraction | solid_volume_fraction | soot | species | temperature | turbulent_dissipation | turbulent_frequency | turbulent_helmholtz_function | turbulent_kinetic_energy | turbulent_v2 | volume_of_fluid | x_momentum | x_solid_momentum | y_momentum | y_solid_momentum | z_momentum | z_solid_momentum} [{of} Species] {=} porous_flux_field_name

Summary

  Specify name of the external field containing the flux transferred from the porous region for the specified equation. For continuity this should be the mass flux (rho*u) field, for enthalpy or species this should be the diffusive flux field.

Parameter | Value | Default
--- | --- | ---
equation | {conserved_enthalpy | continuity | edc_product | enthalpy | mixture_fraction | nuclei | progress_variable | scalar_variance | second_mixture_fraction | solid_volume_fraction | soot | species | temperature | turbulent_dissipation | turbulent_frequency | turbulent_helmholtz_function | turbulent_kinetic_energy | turbulent_v2 | volume_of_fluid | x_momentum | x_solid_momentum | y_momentum | y_solid_momentum | z_momentum | z_solid_momentum} | –
Species | string | –
{=} | {= | are | is} | –
porous_flux_field_name | string | –

###### Porous Penalty Field For

Syntax

  Porous Penalty Field For {conserved_enthalpy | continuity | edc_product | enthalpy | mixture_fraction | nuclei | progress_variable | scalar_variance | second_mixture_fraction | solid_volume_fraction | soot | species | temperature | turbulent_dissipation | turbulent_frequency | turbulent_helmholtz_function | turbulent_kinetic_energy | turbulent_v2 | volume_of_fluid | x_momentum | x_solid_momentum | y_momentum | y_solid_momentum | z_momentum | z_solid_momentum} [{of} Species] {=} porous_penalty_field_name

Summary

  Specify name of the external field containing the penalty parameter transferred from the porous region for the specified equation.

Parameter | Value | Default
--- | --- | ---
equation | {conserved_enthalpy | continuity | edc_product | enthalpy | mixture_fraction | nuclei | progress_variable | scalar_variance | second_mixture_fraction | solid_volume_fraction | soot | species | temperature | turbulent_dissipation | turbulent_frequency | turbulent_helmholtz_function | turbulent_kinetic_energy | turbulent_v2 | volume_of_fluid | x_momentum | x_solid_momentum | y_momentum | y_solid_momentum | z_momentum | z_solid_momentum} | –
Species | string | –
{=} | {= | are | is} | –
porous_penalty_field_name | string | –

###### Porous Target Value Field For

Syntax

  Porous Target Value Field For {conserved_enthalpy | continuity | edc_product | enthalpy | mixture_fraction | nuclei | progress_variable | scalar_variance | second_mixture_fraction | solid_volume_fraction | soot | species | temperature | turbulent_dissipation | turbulent_frequency | turbulent_helmholtz_function | turbulent_kinetic_energy | turbulent_v2 | volume_of_fluid | x_momentum | x_solid_momentum | y_momentum | y_solid_momentum | z_momentum | z_solid_momentum} [{of} Species] {=} porous_target_field_name

Summary

  Specify name of the external field containing the target value transferred from the porous region for the specified equation. For continuity this should be pressure, enthalpy it should be enthalpy, and species it should be mass fraction.

Parameter | Value | Default
--- | --- | ---
equation | {conserved_enthalpy | continuity | edc_product | enthalpy | mixture_fraction | nuclei | progress_variable | scalar_variance | second_mixture_fraction | solid_volume_fraction | soot | species | temperature | turbulent_dissipation | turbulent_frequency | turbulent_helmholtz_function | turbulent_kinetic_energy | turbulent_v2 | volume_of_fluid | x_momentum | x_solid_momentum | y_momentum | y_solid_momentum | z_momentum | z_solid_momentum} | –
Species | string | –
{=} | {= | are | is} | –
porous_target_field_name | string | –

###### Porous Volumetric Heat Transfer Coefficient

Syntax

  Porous Volumetric Heat Transfer Coefficient {=} porous_vol_xfer_field_name

Summary

  Specify name of the external field containing the volumetric heat transfer coefficient transferred from the porous region.

Parameter | Value | Default
--- | --- | ---
{=} | {= | are | is} | –
porous_vol_xfer_field_name | string | –

###### Post Process Delta Area

Syntax

  Post Process Delta Area

Summary

  Request post processing of delta area on this mesh part.

Description

  Area change can be post-processed on this mesh part for laminar or turbulent flows. This option calculates the absolute value of area change after each iteration of a time step, writes it to the log and stores the last value for a given step. The value can be accessed by solution control and used as a criterion in the evaluator. To access this value use `region_name.MaxDeltaArea(n)` where for area change in the x-direction n=1, area change in the y-direction n=2, and area change in the z-direction n=3.

  Note that `MaxDeltaArea(1)` will return the maximum area change in x-direction if the request to post process this value was made on more than one boundary in a given region.

###### Post Process Delta Mass Flow Rate

Syntax

  Post Process Delta Mass Flow Rate

Summary

  Request post processing of delta mass flow rate on this mesh part.

Description

  Mass flow rate change can be post-processed on this mesh part for laminar or turbulent flows. This option calculates the absolute value of mass flow rate change after each iteration of a time step, writes it to the log and stores the last value for a given step. The value can be accessed by solution control and used as a criterion in the evaluator. To access this variable use `region_name.MaxDeltaMassFlowRate(0)`.

  Note that `MaxDeltaMassFlowRate(0)` will return the maximum mass flow rate change if the request to post process this value was made on more than one boundary in a given region.

###### Post Process Delta Pressure

Syntax

  Post Process Delta Pressure

Summary

  Request post processing of delta pressure on this mesh part.

Description

  Pressure change can be post-processed on this mesh part for laminar or turbulent flows. This option calculates the absolute value of pressure change after each iteration of a time step, writes it to the log and stores the last value for a given step. The value can be accessed by solution control and used as a criterion in the evaluator. To access this value use `region_name.MaxDeltaPressure(n)` where for pressure change in the x-direction n=1, pressure change in the y-direction n=2, and pressure change in the z-direction n=3.

  Note that `MaxDeltaPressure(1)` will return the maximum pressure change in x-direction if the request to post process this value was made on more than one boundary in a given region.

###### Post Process Delta Thrust

Syntax

  Post Process Delta Thrust

Summary

  Request post processing of delta thrust on this mesh part.

Description

  Thrust change can be post-processed on this mesh part for laminar or turbulent flows. This option calculates the absolute value of thrust change after each iteration of a time step, writes it to the log and stores the last value for a given step. The value can be accessed by solution control and used as a criterion in the evaluator. To access this value use `region_name.MaxDeltaThrust(n)` where for thrust change in the x-direction n=1, thrust change in the y-direction n=2, and thrust change in the z-direction n=3.

  Note that `MaxDeltaThrust(1)` will return the maximum thrust change in x-direction if the request to post process this value was made on more than one boundary in a given region.

###### Postprocess

Syntax

  Postprocess FluxType Flux Of {conserved_enthalpy | continuity | edc_product | enthalpy | mixture_fraction | nuclei | progress_variable | scalar_variance | second_mixture_fraction | solid_volume_fraction | soot | species | temperature | turbulent_dissipation | turbulent_frequency | turbulent_helmholtz_function | turbulent_kinetic_energy | turbulent_v2 | volume_of_fluid | x_momentum | x_solid_momentum | y_momentum | y_solid_momentum | z_momentum | z_solid_momentum} [ As aliases… ]

Summary

  Enable nodal flux post-processing for a given equation. Flux types can be “total”, “advective”, or “diffusive”. Integrated fluxes will also be output to global variables for post-processing or use in other string functions.

  By default the variables will be named based on the equation and sideset they are applied to as bc_FluxType_EquationName_flux_SurfaceName. However, if you want to assign a more compact or descriptive name you can provide it with

      POSTPROCESS TOTAL FLUX OF Continuity AS mdot1

  When post-processing enthalpy, the average temperature is also output as a global variable. If you provide only one alias the enthalpy flux uses your alias and the average temperature is automatically named. If you provide two aliases the first is used for enthalpy and the second is used for temperature.

      POSTPROCESS TOTAL FLUX OF ENTHALPY AS hFlux
      POSTPROCESS TOTAL FLUX OF ENTHALPY AS hFlux Tavg

  When post-processing species, the post-processor is run for each species that is solved for. This means that there is no post-processor run on the last species (which is determined by a fractional balance). If you provide aliases for the species post-processor you should provide one for each post-processed species. For example, in a problem with O2, CO2, and N2 (in that order) you could use:

      POSTPROCESS TOTAL FLUX OF SPECIES AS mdotO2 mdotCO2

Parameter | Value | Default
--- | --- | ---
FluxType | string | –
equation | {conserved_enthalpy | continuity | edc_product | enthalpy | mixture_fraction | nuclei | progress_variable | scalar_variance | second_mixture_fraction | solid_volume_fraction | soot | species | temperature | turbulent_dissipation | turbulent_frequency | turbulent_helmholtz_function | turbulent_kinetic_energy | turbulent_v2 | volume_of_fluid | x_momentum | x_solid_momentum | y_momentum | y_solid_momentum | z_momentum | z_solid_momentum} | –

###### Progress_Variable

Syntax

  Progress_Variable ProgressVariableName {=} Value

Summary

  Constant value for the progress variable of selected scalars.

Parameter | Value | Default
--- | --- | ---
ProgressVariableName | string | –
{=} | {= | are | is} | –
Value | real | –

###### Real Data For Subroutine

Syntax

  Real Data For Subroutine SubName {=} Values…

Summary

  List of real data values to be passed down in to the user subroutine. These values may be changed by the user subroutine.

Parameter | Value | Default
--- | --- | ---
SubName | string | –
{=} | {= | are | is} | –
Values | real… | –

###### Radiation Boundary Temperature

Syntax

  Radiation Boundary Temperature {=} value

Summary

  Constant value for radiation_boundary_temperature variable.

Parameter | Value | Default
--- | --- | ---
{=} | {= | are | is} | –
value | “string” | –

###### Radiation Boundary Temperature Field

Syntax

  Radiation Boundary Temperature Field {=} FieldName

Summary

  Name of the field to use for the radiation boundary temperature.

Parameter | Value | Default
--- | --- | ---
{=} | {= | are | is} | –
FieldName | string | –

###### Radiation Environment Temperature

Syntax

  Radiation Environment Temperature {=} value

Summary

  Constant value for radiation_environment_temperature variable.

Parameter | Value | Default
--- | --- | ---
{=} | {= | are | is} | –
value | “string” | –

###### Radiation Environment Temperature Field

Syntax

  Radiation Environment Temperature Field {=} FieldName

Summary

  Name of the field to use for the radiation environment temperature.

Parameter | Value | Default
--- | --- | ---
{=} | {= | are | is} | –
FieldName | string | –

###### Specific Surface Area Field

Syntax

  Specific Surface Area Field {=} ssa_field_name

Summary

  Specify name of the external field containing the specific surface area transferred from the porous region.

Parameter | Value | Default
--- | --- | ---
{=} | {= | are | is} | –
ssa_field_name | string | –

###### Subroutine For

Syntax

  Subroutine For {contact_angle | edc_product | gas_volume_fraction | mixture_fraction | pressure | progress_variable | scalar_variance | second_mixture_fraction | solid_volume_fraction | soot_mass_fraction | soot_nuclei_mass_fraction | temperature | turbulent_dissipation | turbulent_frequency | turbulent_helmholtz_function | turbulent_kinetic_energy | turbulent_v2 | volume_of_fluid | x_solid_velocity | x_velocity | y_solid_velocity | y_velocity | z_solid_velocity | z_velocity} {=} Subroutine

Summary

  Name of the subroutine to use for this variable.

Parameter | Value | Default
--- | --- | ---
PrimitiveVariable | {contact_angle | edc_product | gas_volume_fraction | mixture_fraction | pressure | progress_variable | scalar_variance | second_mixture_fraction | solid_volume_fraction | soot_mass_fraction | soot_nuclei_mass_fraction | temperature | turbulent_dissipation | turbulent_frequency | turbulent_helmholtz_function | turbulent_kinetic_energy | turbulent_v2 | volume_of_fluid | x_solid_velocity | x_velocity | y_solid_velocity | y_velocity | z_solid_velocity | z_velocity} | –
{=} | {= | are | is} | –
Subroutine | string | –

###### Subroutine For Emissivity

Syntax

  Subroutine For Emissivity {=} subroutineName

Summary

  Name of the user subroutine to use for the emissivity variable.

Parameter | Value | Default
--- | --- | ---
{=} | {= | are | is} | –
subroutineName | string | –

###### Subroutine For Mass_Fraction

Syntax

  Subroutine For Mass_Fraction {=} Subroutine

Summary

  Name of the subroutine to use for the mass fraction. ALL species mass fractions must be assigned by this subroutine.

Parameter | Value | Default
--- | --- | ---
{=} | {= | are | is} | –
Subroutine | string | –

###### Subroutine For Mole_Fraction

Syntax

  Subroutine For Mole_Fraction {=} Subroutine

Summary

  Name of the subroutine to use for the mole fractions. ALL species mole fractions must be assigned by this subroutine.

Parameter | Value | Default
--- | --- | ---
{=} | {= | are | is} | –
Subroutine | string | –

###### Subroutine For Radiation Boundary Temperature

Syntax

  Subroutine For Radiation Boundary Temperature {=} subroutineName

Summary

  Name of the user subroutine to use for the radiation_boundary_temperature variable.

Parameter | Value | Default
--- | --- | ---
{=} | {= | are | is} | –
subroutineName | string | –

###### Subroutine For Radiation Environment Temperature

Syntax

  Subroutine For Radiation Environment Temperature {=} subroutineName

Summary

  Name of the user subroutine to use for the radiation_environment_temperature variable.

Parameter | Value | Default
--- | --- | ---
{=} | {= | are | is} | –
subroutineName | string | –

###### Subroutine For Transmissivity

Syntax

  Subroutine For Transmissivity {=} subroutineName

Summary

  Name of the user subroutine to use for the transmissivity variable.

Parameter | Value | Default
--- | --- | ---
{=} | {= | are | is} | –
subroutineName | string | –

###### Subroutine For Transparent Band Emissivity

Syntax

  Subroutine For Transparent Band Emissivity {=} subroutineName

Summary

  Name of the user subroutine to use for the transparent emissivity band for spectral emissivity on surfaces.

Parameter | Value | Default
--- | --- | ---
{=} | {= | are | is} | –
subroutineName | string | –

###### Transparent Band Emissivity

Syntax

  Transparent Band Emissivity {=} value

Summary

  Constant value to use for the emissivity in the transparent band for spectral surfaces.

Parameter | Value | Default
--- | --- | ---
{=} | {= | are | is} | –
value | “string” | –

###### Transmissivity

Syntax

  Transmissivity {=} value

Summary

  Constant value for transmissivity variable.

Parameter | Value | Default
--- | --- | ---
{=} | {= | are | is} | –
value | “string” | –

###### Turbulence_Intensity

Syntax

  Turbulence_Intensity {=} Turbulent intensity

Summary

  Specify turbulent intensity for use in the calculation for the entrainment value of turbulent kinetic energy when there is possible entrainment on open pressure specified boundary.

Parameter | Value | Default
--- | --- | ---
{=} | {= | are | is} | –
Turbulent intensity | real | –

###### Use Porous Coupling For

Syntax

  Use Porous Coupling For {conserved_enthalpy | continuity | edc_product | enthalpy | mixture_fraction | nuclei | progress_variable | scalar_variance | second_mixture_fraction | solid_volume_fraction | soot | species | temperature | turbulent_dissipation | turbulent_frequency | turbulent_helmholtz_function | turbulent_kinetic_energy | turbulent_v2 | volume_of_fluid | x_momentum | x_solid_momentum | y_momentum | y_solid_momentum | z_momentum | z_solid_momentum}

Summary

  Enable porous fluid coupling algorithm for specified equation.

Parameter | Value | Default
--- | --- | ---
equation | {conserved_enthalpy | continuity | edc_product | enthalpy | mixture_fraction | nuclei | progress_variable | scalar_variance | second_mixture_fraction | solid_volume_fraction | soot | species | temperature | turbulent_dissipation | turbulent_frequency | turbulent_helmholtz_function | turbulent_kinetic_energy | turbulent_v2 | volume_of_fluid | x_momentum | x_solid_momentum | y_momentum | y_solid_momentum | z_momentum | z_solid_momentum} | –