This section is referenced in the following other sections

Simulation Setup: Fixed

6.12.1. Fixed Boundary Condition On Surface

Scope: Fuego Region
Summary: Defines a fixed boundary condition on a named surface of the mesh.

begin Fixed 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

   Emissivity Spectral File Name {=} Name

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

   Emissivity {=} 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  ]

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

   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_Fraction Species {=} Mass fraction

   Mole_Fraction Species {=} Mole fraction

   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

   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

   Subroutine For Wall Temperature {=} subroutineName

   Transparent Band Emissivity {=} value

   Transmissivity {=} value

   Wall Temperature {=} value

end Fixed Boundary Condition On Surface Surfacename

6.12.1.1. 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”	–

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”	–

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	–

Function For Wall Temperature

Syntax: Function For Wall Temperature {=} functionName [ In The {t | x | y | z} Direction ]
Summary: Name of function to use for the wall_temperature variable, in the specified direction.

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

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_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”	–

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	–

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	–

Subroutine For Wall Temperature

Syntax: Subroutine For Wall Temperature {=} subroutineName
Summary: Name of the user subroutine to use for the wall_temperature variable.

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”	–

Wall Temperature

Syntax: Wall Temperature {=} value
Summary: Value for wall_temperature variable. Can be a constant or a string function of space (x,y,z), time (t) or global variables.

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