7.11. Initial Conditions

This section is referenced in the following other sections

Simulation Setup: Initial Conditions

7.11.1. Initial Condition Block

Scope: Fuego Region
Summary: Allows the specification of piecewise constant initial conditions on any combination of volumes, surfaces and nodes.

begin Initial Condition Block BlockName

    {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

   Copy Nodal File Variable ExodusName To Region Field AfgoName [ At Time InterpTime  ]

   External Field For VariableName {=} ExtFieldName [ Of Size Value  ]

   External Field For Progress_Variable ProgressVariableName {=} ExtFieldName

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

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

   Ignite

   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 {=} y0

   Mole_Fraction Species {=} y0

   Progress_Variable ProgressVariableName {=} Value

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

   Solid Object {=} t0

   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} {=} SubName

   Subroutine For Mass_Fraction {=} Sub

   Subroutine For Mole_Fraction {=} Sub

   Update Enthalpy And Density

   Vof Shape 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} {=} ShapeName ShapeArgs...

   Volume {=} Blocks...

end Initial Condition Block BlockName

7.11.1.1. 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

Assign initial condition to the specified variable. Specified value can be a constant or a string function of time, space, and global variables.

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

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”	–

Copy Nodal File Variable

Syntax: Copy Nodal File Variable ExodusName To Region Field AfgoName [ At Time InterpTime ]
Summary: Solid geometry to which this initial condition applies.

Parameter	Value	Default
ExodusName	string	–
AfgoName	string	–

External Field For

Syntax: External Field For VariableName {=} ExtFieldName [ Of Size Value ]
Summary: Name of the field that is to be transferred in.

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

External Field For Progress_Variable

Syntax: External Field For Progress_Variable ProgressVariableName {=} ExtFieldName
Summary: Name of the progress variable field that is to be transferred in.

Parameter	Value	Default
ProgressVariableName	string	–
{=}	{= \| are \| is}	–
ExtFieldName	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 with which to set the initial condition for the given variable in the given 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	–
Direction	{t \| x \| y \| z}	–

Function For Mass_Fraction

Syntax: Function For Mass_Fraction {=} FuncName In The {t | x | y | z} Direction
Summary: Names of functions with which to set the initial mass fractions for the given species in the given direction.

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 mole 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}	–

Ignite

Syntax: Ignite
Summary: Flag this block for combustion ignition

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 ICs 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 {=} y0
Summary: Set the initial mass fraction. Specified value can be a constant or a string function of time, space, and global variables.

Parameter	Value	Default
Species	string	–
{=}	{= \| are \| is}	–
y0	“string”	–

Mole_Fraction

Syntax: Mole_Fraction Species {=} y0
Summary: Set the initial mole fractions to a constant value.

Parameter	Value	Default
Species	string	–
{=}	{= \| are \| is}	–
y0	“string”	–

Progress_Variable

Syntax: Progress_Variable ProgressVariableName {=} Value
Summary: Set the initial progress variable. Specified value can be a constant or a string function of time, space, and global variables.

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

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…	–

Solid Object

Syntax: Solid Object {=} t0
Summary: Solid geometry to which this initial condition applies.

Parameter	Value	Default
{=}	{= \| are \| is}	–
t0	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} {=} SubName
Summary: Set the initial condition on the specified variable using a subroutine

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}	–
SubName	string	–

Subroutine For Mass_Fraction

Syntax: Subroutine For Mass_Fraction {=} Sub
Summary: Set the initial mass fractions using a subroutine.

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

Subroutine For Mole_Fraction

Syntax: Subroutine For Mole_Fraction {=} Sub
Summary: Set the initial mole fractions using a subroutine.

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

Update Enthalpy And Density

Syntax: Update Enthalpy And Density
Summary: Flag this block for updating enthalpy after replacing T or Y

Vof Shape For

Syntax: Vof Shape 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} {=} ShapeName ShapeArgs…
Summary: Set the smooth VOF initial conditions using basic shapes. Multiple shapes can be specified, and where they intersect will be a union operation.

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}	–
ShapeName	string	–
ShapeArgs	string…	–

Volume

Syntax

Volume {=} Blocks…

Summary

Element Block name(s) to which this initial condition applies.

For multiple blocks, you can either use multiple VOLUME = X lines or specify all the blocks in one line as VOLUME = X Y Z.

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