7.38. Solution Options

This section is referenced in the following other sections

Simulation Setup: Solution Options

7.38.1. Solution Options

Scope: Aria Region
Summary: Specify information regarding the governing equations to be solved.

begin Solution Options OptionsName

   Apply Flux Limiter Stabilization

   Check Matrix For Discrete Maximum Principle

   Face Stabilization Multiplier {=} Multiplier

   Force Non Tale {=} {false | no | off | on | true | yes}

   Free Stream Reynolds Number {=} input_Re

   Ignore Coordinate Displacements {=} {false | no | off | on | true | yes}

   Maximum Temperature Allowed From Temperature Extraction {=} MaxTemp

   Maximum Wall Time {=} WallTime Hours

   Minimum Temperature Allowed From Temperature Extraction {=} MinTemp

   Omit Enthalpy Adjustment After Temperature Clipping

   Omit Finite Difference Sensitivities For Cantera Properties

   Use Inverse Density Continuity Scaling {=} {false | no | off | on | true | yes}

   begin Cvfem Algorithm Specification PStabName
   end

   begin Edc Model Specification EdcSpecName
   end

   begin Hdiff Model Specification HdiffOptionsName
   end

   begin Porous Flow Options blockName
   end

   begin Species Options blockName
   end

   begin Turbulence Model Specification TurbSpecName
   end

end Solution Options OptionsName

7.38.1.1. Line Commands

Apply Flux Limiter Stabilization

Syntax: Apply Flux Limiter Stabilization
Summary: Enables flux limiter stabilization for diffusion.
Description: This activates flux limiter stabilization for diffusion terms to prevent non-physical temperatures on meshes that don’t satisfy the requirements for a discrete maximum principle, or for anisotropic material properties.

Check Matrix For Discrete Maximum Principle

Syntax: Check Matrix For Discrete Maximum Principle
Summary: Examine rows of the system matrix before boundary conditions are applied and check if the diagonal entries are non-negative, the off-diagonal entries are non-positive, the row-sum is non-negative. If these conditions fail, it is possible the solution will contain non-physical values, and the discrete maximum principle is not satisfied by the matrix. If any of these conditions fail, a warning is printed to the log file. More output can be obtained with turning on debug logging.

Face Stabilization Multiplier

Syntax: Face Stabilization Multiplier {=} Multiplier
Summary: Multiplier for face stabilization term.
Description: This value specifies the multiplier applied to the stabilization terms activated by the GRAD_JUMP_PENALTY or DMP stabilization terms on the specified equation.

Parameter	Value	Default
{=}	{= \| are \| is}	–
Multiplier	real	1.0

Force Non Tale

Syntax: Force Non Tale {=} {false | no | off | on | true | yes}
Summary: Enable (true) to force simulation not to use TALE.

Parameter	Value	Default
{=}	{= \| are \| is}	–
Value	{false \| no \| off \| on \| true \| yes}	FALSE

Free Stream Reynolds Number

Syntax: Free Stream Reynolds Number {=} input_Re
Summary: Input Reynolds number is used for solving nondimensional viscous problems using the GasDyn equations.

Parameter	Value	Default
{=}	{= \| are \| is}	–
input_Re	real	–

Ignore Coordinate Displacements

Syntax: Ignore Coordinate Displacements {=} {false | no | off | on | true | yes}
Summary: Enable (true) or disable (false) displacing the physical coordinates by either MESH_DISPLACEMENTS or SOLID_DISPLACEMENTS. By default, this is false, and physical_coordinates are displaced. However, this can be disabled by setting this to true, and physical_coordinates will be equal to model_coordinates.

Parameter	Value	Default
{=}	{= \| are \| is}	–
Value	{false \| no \| off \| on \| true \| yes}	FALSE

Maximum Temperature Allowed From Temperature Extraction

Syntax: Maximum Temperature Allowed From Temperature Extraction {=} MaxTemp
Summary: Specify a maximum cutoff temperature for extraction from enthalpy and composition
Description: This option specifies the maximum temperature to be allowed to be extracted from enthalpy, given the mixture composition. If a temperature is computed that is greater than this value, the temperature is reset to equal the maximum allowed value.

Parameter	Value	Default
{=}	{= \| are \| is}	–
MaxTemp	real	2400.0 K

Maximum Wall Time

Syntax: Maximum Wall Time {=} WallTime Hours
Summary: Specify a maximum wall time to let the simulation end gracefully and output before slurm kills it.

Parameter	Value	Default
{=}	{= \| are \| is}	–
WallTime	real	Infinite

Minimum Temperature Allowed From Temperature Extraction

Syntax: Minimum Temperature Allowed From Temperature Extraction {=} MinTemp
Summary: Specify a minimum cutoff temperature for extraction from enthalpy and composition
Description: This option specifies the minimum temperature to be allowed to be extracted from enthalpy, given the mixture composition. If a temperature is computed that is less than this value, the temperature is reset to equal the minimum allowed value.

Parameter	Value	Default
{=}	{= \| are \| is}	–
MinTemp	real	250.0 K

Omit Enthalpy Adjustment After Temperature Clipping

Syntax: Omit Enthalpy Adjustment After Temperature Clipping
Summary: Do not adjust enthalpy to be consistent with clipped temperatures
Description: When temperature extraction fails to produce a viable result, the temperature will usually be clipped at either the upper or lower limit temperature. By default, the enthalpy will then be adjusted up or down to match the clipped temperature so that the thermochemical state is internally consistent. This omits the enthalpy adjustment, leaving clipped nodes in an inconsistent state.

Omit Finite Difference Sensitivities For Cantera Properties

Syntax: Omit Finite Difference Sensitivities For Cantera Properties
Summary: Do not populate any Cantera property sensitivities via finite difference

Use Inverse Density Continuity Scaling

Syntax: Use Inverse Density Continuity Scaling {=} {false | no | off | on | true | yes}
Summary: Enable (true) or disable (false) the inverse element scaling of the continuity equation.

Parameter	Value	Default
{=}	{= \| are \| is}	–
Value	{false \| no \| off \| on \| true \| yes}	TRUE

7.38.1.2. Cvfem Algorithm Specification

Scope: Solution Options
Summary: Specify CVFEM algorithmic modeling options.

begin Cvfem Algorithm Specification PStabName

   Activate Acoustic Compressibility Algorithm

   Activate Ausm Plus Scheme

   Activate Edge Based Diffusion Operator [ With {minimum_nonorthogonal_correction | orthogonal_nonorthogonal_correction | overrelaxed_nonorthogonal_correction}  ]

   Activate Edge Based Fourth Order Advection

   Activate Kexact Muscl Scheme For Equation EquationString [{of} SpeciesName  | {in} MaterialPhaseName] [ Using K {=} kappa  ]

   Activate Mixture Fraction Clipping Utility At {begin_nonlinear_solve | end_nonlinear_solve | manually_run | post_iterate | post_linear_solve | post_nonlinear_solve | pre_iterate | pre_linear_solve | pre_nonlinear_solve | run_initially | run_once | run_post_linear_system_initialization}

   Activate Muscl Scheme For Equation EquationString [{of} SpeciesName  | {in} MaterialPhaseName]

   Activate Pressure Projection Algorithm

   Activate Projected Stress Stabilization

   Activate Scv Nodal Gradient

   Activate Shakib Scaling

   Activate Vrtm In Mass Flux Vector

   Ausm Alpha {=} alpha

   Ausm Beta {=} beta

   Clip Cvfem Level Set Dof

   First Order Upwind Factor {=} RealValue For Equation EquationString [{of} SpeciesName  | {in} MaterialPhaseName]

   Flux Scheme {=} {ausm | ausm_plus | roe | van_leer}

   Freeze Muscl Limiter At Global Step {=} freezeStep

   Hybrid Upwind Factor {=} RealValue For Equation EquationString [{of} SpeciesName  | {in} MaterialPhaseName]

   Interpolate Density And Velocity Separately In Mass Flux Vector

   Lag Nodal Pressure Gradient In Mass Flux Vector Expression

   Lag Nodal Tau In Mass Flux Vector Expression

   Muscl Limiter {=} {muscl_minmod | muscl_none | muscl_superbee | muscl_van_albada | muscl_van_leer} For Equation EquationString [{of} SpeciesName  | {in} MaterialPhaseName]

   Omit Diffusion Term From Sucv Tau

   Omit Disting Bc Ip Sensitivities

   Omit Dt Term From Sucv Tau

   Pressure Stabilization Characteristic Length {=} CharLength

   Pressure Stabilization Order {=} {fourth_order | second_order | zeroth_order}

   Pressure Stabilization Parameter Scaling {=} TauScaling

   Pressure Stabilization Scaling {=} {characteristic | constant | shakib | stabilized | time_step} [ With Value {=} ConstantTau  ]

   Roe Entropy Fix C {=} epsc

   Roe Entropy Fix U {=} epsu

   Upwind Method {=} {fourth | gupw | muscl | sucv | upw} For Equation EquationString [{of} SpeciesName  | {in} MaterialPhaseName]

   Use Approximate Roe Sensitivities

   Use Opposing Subface In Open Mass Flux

   Use Specified Pressure In Open Mass Flux

end Cvfem Algorithm Specification PStabName

7.38.1.2.1. Line Commands

Activate Acoustic Compressibility Algorithm

Syntax: Activate Acoustic Compressibility Algorithm
Summary: Variable thermodynamic pressure to allow for closed system pressurization

Activate Ausm Plus Scheme

Syntax: Activate Ausm Plus Scheme
Summary: Activate AUSM plus with standard values for alpha and beta
Description: Activate AUSM plus scheme.

Activate Edge Based Diffusion Operator

Syntax: Activate Edge Based Diffusion Operator [ With {minimum_nonorthogonal_correction | orthogonal_nonorthogonal_correction | overrelaxed_nonorthogonal_correction} ]
Summary: Activate edge-based scheme for diffusion operator.
Description: Only implemented now for tke and sdr - interior only

Activate Edge Based Fourth Order Advection

Syntax: Activate Edge Based Fourth Order Advection
Summary: Activate edge-based advection for fourth order LES scheme
Description: Activate edge-based advection for fourth order LES scheme

Activate Kexact Muscl Scheme For Equation

Syntax: Activate Kexact Muscl Scheme For Equation EquationString [{of} SpeciesName | {in} MaterialPhaseName] [ Using K {=} kappa ]
Summary: Use kexact MUSCL variable extrapolation for the specified equation
Description: Use kexact MUSCL variable extrapolation for the specified equation. The projected gradients for the necessary variables must be computed using a cvfem_lumped_muscl_projection equation.

Parameter	Value	Default
EquationString	string	–
{of}	{of \| species}	–
SpeciesName	string	–
{in}	{in \| material_phase}	–
MaterialPhaseName	string	–

Activate Mixture Fraction Clipping Utility At

Syntax: Activate Mixture Fraction Clipping Utility At {begin_nonlinear_solve | end_nonlinear_solve | manually_run | post_iterate | post_linear_solve | post_nonlinear_solve | pre_iterate | pre_linear_solve | pre_nonlinear_solve | run_initially | run_once | run_post_linear_system_initialization}
Summary: Activate clipping utility for mixture fraction
Description: Sometimes it helps to clip the mixture fraction. This is a utility that provides this support.

Parameter	Value	Default
UtilClipLocation	{begin_nonlinear_solve \| end_nonlinear_solve \| manually_run \| post_iterate \| post_linear_solve \| post_nonlinear_solve \| pre_iterate \| pre_linear_solve \| pre_nonlinear_solve \| run_initially \| run_once \| run_post_linear_system_initialization}	–

Activate Muscl Scheme For Equation

Syntax: Activate Muscl Scheme For Equation EquationString [{of} SpeciesName | {in} MaterialPhaseName]
Summary: Use MUSCL variable extrapolation for the specified equation
Description: Use MUSCL variable extrapolation for the specified equation. The projected gradients for the necessary variables must be computed using a cvfem_lumped_muscl_projection equation.

Parameter	Value	Default
EquationString	string	–
{of}	{of \| species}	–
SpeciesName	string	–
{in}	{in \| material_phase}	–
MaterialPhaseName	string	–

Activate Pressure Projection Algorithm

Syntax: Activate Pressure Projection Algorithm
Summary: Activate PP alg.
Description: Rather than fully coupling uvwp, activate a pressure projection algorithm. This will require creating two EQ systems: uvw and p. However, once this is created, the code will handle supplemental utilities. This option can only be used in the context of a momentum lumped mass matrix

Activate Projected Stress Stabilization

Syntax: Activate Projected Stress Stabilization
Summary: Activate full momentum stress term for residual stabilization
Description: Activate full momentum stress term for residual stabilization

Activate Scv Nodal Gradient

Syntax: Activate Scv Nodal Gradient
Summary: Use scv nodal gradient for MUSCL and edge-based diffusion terms
Description: Use scv nodal gradient for MUSCL and edge-based diffusion terms; default is to use nodal grad based on Green Gauss over the duel mesh with edge based integration points.

Activate Shakib Scaling

Syntax: Activate Shakib Scaling
Summary: Specify Shakib scaling; temp line command

Activate Vrtm In Mass Flux Vector

Syntax: Activate Vrtm In Mass Flux Vector
Summary: Activate velocity relative to mesh in mass flux vector
Description: In some cases, the volume may be constant, although there is mesh motion. This is the case in wind energy sliding mesh applications. This algorithm pays not attention to GCL and assumes that the time rate of volume is zero. Again, this is fine in solid rotation.

Ausm Alpha

Syntax: Ausm Alpha {=} alpha
Summary: Set constant alpha in Mach splitting function.
Description: Default is 0, unless ausm+ is chosen, then the default is 3/16.

Parameter	Value	Default
{=}	{= \| are \| is}	–
alpha	real	0.0

Ausm Beta

Syntax: Ausm Beta {=} beta
Summary: Set constant beta in Mach splitting function.
Description: Default is 0, unless ausm+ is chosen, then the default is 1/8..

Parameter	Value	Default
{=}	{= \| are \| is}	–
beta	real	0.0

Clip Cvfem Level Set Dof

Syntax: Clip Cvfem Level Set Dof
Summary: Clip level set; only germane for conserved level set formulation that has bounds between zero and unity

First Order Upwind Factor

Syntax

First Order Upwind Factor {=} RealValue For Equation EquationString [{of} SpeciesName | {in} MaterialPhaseName]

Summary

First-order upwind factor, $0 \lessthan x \le 1$ .

Description

This value specifies the explicit upwind blending between pure upwind and the chosen convection operator, e.g., UPW*(firstOrderUpwind) + (1-firstOrderUpwind)*(blendedUpwindCentral).

where UPW is the pure first order upwind value and blendedUpwindCentral is a blend between the selected upwind method and central difference operator based on the local cell Peclet number (see Hybrid Upwind Factor line command).

For now, the blendedUpwindCentral is pure central.

Parameter	Value	Default
{=}	{= \| are \| is}	–
RealValue	real	1.0
EquationString	string	–
{of}	{of \| species}	–
SpeciesName	string	–
{in}	{in \| material_phase}	–
MaterialPhaseName	string	–

Flux Scheme

Syntax: Flux Scheme {=} {ausm | ausm_plus | roe | van_leer}
Summary: Set flux scheme used by all equations in the high-Mach CVFEM formulation.
Description: Set flux scheme used by all equations in the high-Mach CVFEM formulation.

Parameter	Value	Default
{=}	{= \| are \| is}	–
FluxScheme	{ausm \| ausm_plus \| roe \| van_leer}	–

Freeze Muscl Limiter At Global Step

Syntax: Freeze Muscl Limiter At Global Step {=} freezeStep
Summary: Freeze MUSCL limiter at a given global step
Description: Freeze the MUSCL limiter

Parameter	Value	Default
{=}	{= \| are \| is}	–
freezeStep	real	–

Hybrid Upwind Factor

Syntax: Hybrid Upwind Factor {=} RealValue For Equation EquationString [{of} SpeciesName | {in} MaterialPhaseName]
Summary: Hybrid upwind factor dials in blending between user specified operator and central.
Description: Allows blending of the Peclet factor. A value of zero produces pure central. Higher values blend more user specified upwind (currently, pure first order upwind).

Parameter	Value	Default
{=}	{= \| are \| is}	–
RealValue	real	1.0
EquationString	string	–
{of}	{of \| species}	–
SpeciesName	string	–
{in}	{in \| material_phase}	–
MaterialPhaseName	string	–

Interpolate Density And Velocity Separately In Mass Flux Vector

Syntax: Interpolate Density And Velocity Separately In Mass Flux Vector
Summary: use (rho)ip*(uj)ip rather than default (rho*uj)ip

Lag Nodal Pressure Gradient In Mass Flux Vector Expression

Syntax: Lag Nodal Pressure Gradient In Mass Flux Vector Expression
Summary: Compute the nodal pressure gradient calculation.
Description: Lag the nodal pressure gradient assembly for use in the stabilized mass flux vector expression. This command will place the calculation at the top of the non-linear iteration. In general, it will not be wise to use this option for steady simulations as there is one nonlinear loop.

Lag Nodal Tau In Mass Flux Vector Expression

Syntax: Lag Nodal Tau In Mass Flux Vector Expression
Summary: Compute the nodal tau calculation.
Description: Lag the nodal tau assembly for use in the stabilized mass flux vector expression. This command will place the calculation at the top of the non-linear iteration. In general, it will not be wise to use this option for steady simulations as there is one nonlinear loop.

Muscl Limiter

Syntax: Muscl Limiter {=} {muscl_minmod | muscl_none | muscl_superbee | muscl_van_albada | muscl_van_leer} For Equation EquationString [{of} SpeciesName | {in} MaterialPhaseName]
Summary: Specify the MUSCL limiter method.
Description: TVD limiter.

Parameter	Value	Default
{=}	{= \| are \| is}	–
MusclLimiter	{muscl_minmod \| muscl_none \| muscl_superbee \| muscl_van_albada \| muscl_van_leer}	–
EquationString	string	–
{of}	{of \| species}	–
SpeciesName	string	–
{in}	{in \| material_phase}	–
MaterialPhaseName	string	–

Omit Diffusion Term From Sucv Tau

Syntax: Omit Diffusion Term From Sucv Tau
Summary: Do not use timestep in the expression for the SUCV stabilization coefficient

Omit Disting Bc Ip Sensitivities

Syntax: Omit Disting Bc Ip Sensitivities
Summary: Drop distinguishing bc sensitivities for ip values.
Description: Drop distinguishing bc sensitivities for ip values.

Omit Dt Term From Sucv Tau

Syntax: Omit Dt Term From Sucv Tau
Summary: Do not use timestep in the expression for the SUCV stabilization coefficient

Pressure Stabilization Characteristic Length

Syntax: Pressure Stabilization Characteristic Length {=} CharLength
Summary: Specify a constant length scale to compute tau; only applicable for characteristic scaling

Parameter	Value	Default
{=}	{= \| are \| is}	–
CharLength	real	–

Pressure Stabilization Order

Syntax: Pressure Stabilization Order {=} {fourth_order | second_order | zeroth_order}
Summary: Order of pressure stabilization

Parameter	Value	Default
{=}	{= \| are \| is}	–
Cvfempstaborder	{fourth_order \| second_order \| zeroth_order}	–

Pressure Stabilization Parameter Scaling

Syntax: Pressure Stabilization Parameter Scaling {=} TauScaling
Summary: Scaling of tau

Parameter	Value	Default
{=}	{= \| are \| is}	–
TauScaling	real	–

Pressure Stabilization Scaling

Syntax: Pressure Stabilization Scaling {=} {characteristic | constant | shakib | stabilized | time_step} [ With Value {=} ConstantTau ]
Summary: Scaling coefficient for pressure stabilization

Parameter	Value	Default
{=}	{= \| are \| is}	–
CvfemPStabScaling	{characteristic \| constant \| shakib \| stabilized \| time_step}	–

Roe Entropy Fix C

Syntax: Roe Entropy Fix C {=} epsc
Summary: Small constant for entropy fix (modification of |U +/- c| eigenvalues in Roe scheme)

Parameter	Value	Default
{=}	{= \| are \| is}	–
epsc	real	0.1

Roe Entropy Fix U

Syntax: Roe Entropy Fix U {=} epsu
Summary: Small constant for entropy fix (modification of |U| eigenvalues in Roe scheme)

Parameter	Value	Default
{=}	{= \| are \| is}	–
epsu	real	0.1

Upwind Method

Syntax: Upwind Method {=} {fourth | gupw | muscl | sucv | upw} For Equation EquationString [{of} SpeciesName | {in} MaterialPhaseName]
Summary: Specify method that is blended with pure second order.
Description: This user defined method will be blended with pure second order based on cell Peclet blending. In most cases, this operator is upwinded, however, in the case of 4th order a higher order centered scheme is used.

Parameter	Value	Default
{=}	{= \| are \| is}	–
UpwMethod	{fourth \| gupw \| muscl \| sucv \| upw}	UPW
EquationString	string	–
{of}	{of \| species}	–
SpeciesName	string	–
{in}	{in \| material_phase}	–
MaterialPhaseName	string	–

Use Approximate Roe Sensitivities

Syntax: Use Approximate Roe Sensitivities
Summary: Use approximate Roe sensitivities for the LHS instead of Van Leer
Description: By default, the Roe flux uses the sensitivities for the Van Leer flux scheme form the LHS matrix. This command turns on a different approximation, based more closely on the Roe flux itself; this approximation converges more quickly for some problems, but is less robust for others. Currently this option only has an effect when the “NC_ADV” equation term is used.

Use Opposing Subface In Open Mass Flux

Syntax: Use Opposing Subface In Open Mass Flux
Summary: Open mass flux will be computed using the interpolated pressure at the opposing subface

Use Specified Pressure In Open Mass Flux

Syntax: Use Specified Pressure In Open Mass Flux
Summary: User specified pressure in open BC will be used to compute gradp in open mass flux BC

7.38.1.3. Edc Model Specification

Scope: Solution Options
Summary: Specify EDC combustion model options.

begin Edc Model Specification EdcSpecName

   Activate Co2 Dissociation Model

   Activate Hydrogen Dissociation Model

   Activate Ignition Model {on} IgnPart

   Activate Laminar Limit Model

   Activate Lumped Source Term Model

   Activate Separate Co Irreversible Oxidation Pathway

   Activation Time {=} Time

   Fuel Name {=} Fuel

   Ignition Threshold Temperature {=} IgnTemp

   Minimum Product Fraction {=} Prmin

   Reaction Time Scale {=} Tchem

   Reference Property {=} Value

   Reference Property Of SpeciesName {=} Value

   begin Oxidizer Mixture Specification OxMixName
   end

end Edc Model Specification EdcSpecName

7.38.1.3.1. Line Commands

Activate Co2 Dissociation Model

Syntax: Activate Co2 Dissociation Model
Summary: Include effects of CO2 dissociation into CO and O2 at high temperatures
Description: At high temperatures, the equilibrium between CO2, CO, and O2 shifts away from CO2, which can significantly decrease the flame temperature. Activating this model will add this effect to the standard EDC combustion model.

Activate Hydrogen Dissociation Model

Syntax

Activate Hydrogen Dissociation Model

Summary

Include effects of H2 dissociation into H

Description

At temperatures greater than about 2000K, the equilibrium between H2 and H will yield non-negligible concentrations of H which can significantly decrease flame temperatures. Activating this model will add this effect to the standard EDC combustion model using the correlations of W.W. Erikson, which are derived from the NASA CEA code [56, 57].

Note that the H species must be included in the Cantera input XML file, and neither H nor H2 should be the “last” species in the list since this species is not independent of the rest (to enforce unity sum) and may be susceptible to more noise than the others. Since temperature and other properties are very sensitive to oscillations in the H and H2 equilibrium, this noise could be problematic.

Activate Ignition Model

Syntax: Activate Ignition Model {on} IgnPart
Summary: MeshPart on which to use the EDC ignition model
Description: Turn on the ignition model for this MeshPart. If fuel and oxidizer are present and the temperature is below the ignition threshold temperature everywhere in the part, reaction will begin. Volume block names and surface names are valid for this command, as well as the alias “all_blocks” and “all_surfaces”. Multiple parts must be specified with multiple instances of this line command.

Parameter	Value	Default
{on}	{@ \| at \| for \| in \| on \| over}	–
IgnPart	string	–

Activate Laminar Limit Model

Syntax: Activate Laminar Limit Model
Summary: Turn on the EDC laminar limit model for low-turbulence situations
Description: Turn on the EDC laminar limit model. This model requires setting three model constants: CtauLam, CgammaLam, and ClamTrans. The model uses a time scale based on a velocity gradient rather than the turb_ke/turb_diss. This appropriate time scale permits the flame to anchor in laminar regions.

Activate Lumped Source Term Model

Syntax: Activate Lumped Source Term Model
Summary: Nodally lump the EDC source term
Description: If set, the EDC source terms are nodally lumped, rather than using the default implementation of a consistent approach at the Gauss points.

Activate Separate Co Irreversible Oxidation Pathway

Syntax: Activate Separate Co Irreversible Oxidation Pathway
Summary: Add CO oxidation pathway as a separate reaction pathway. This should really be used only in the context of a propellant fire in the presence of hydrogen combustion.

Activation Time

Syntax: Activation Time {=} Time
Summary: The time at which the EDC combustion model is activated. No combustion will occur before this time.

Parameter	Value	Default
{=}	{= \| are \| is}	–
Time	real	0.0

Fuel Name

Syntax: Fuel Name {=} Fuel
Summary: The name of the EDC fuel species, typically either H2 or a major hydrocarbon

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

Ignition Threshold Temperature

Syntax: Ignition Threshold Temperature {=} IgnTemp
Summary: The temperature below which the ignition model is activated
Description: If the ignition model is requested (through the “ACTIVATE IGNITION MODEL” line command, then it will be activated if all temperatures in the corresponding block are below this temperature.

Parameter	Value	Default
{=}	{= \| are \| is}	–
IgnTemp	real	1000 K

Minimum Product Fraction

Syntax: Minimum Product Fraction {=} Prmin
Summary: The minimum product fraction, below which the EDC model will be deactivated.

Parameter	Value	Default
{=}	{= \| are \| is}	–
Prmin	real	1.0e-6

Reaction Time Scale

Syntax: Reaction Time Scale {=} Tchem
Summary: Reaction time scale to set extinction
Description: Characteristic time scale of the chemical kinetics. Residence time in the fine structure region will be compared to this to determine if extinction will result.

Parameter	Value	Default
{=}	{= \| are \| is}	–
Tchem	real	7.0e-5

Reference

Syntax: Reference Property {=} Value
Summary: Reference property for initial diagnostic output
Description: If all required properties are set, the EDC model will print the adiabatic flame temperature and heat of combustion for the mechanism defined by the specified fuel.

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

Reference

Syntax: Reference Property Of SpeciesName {=} Value
Summary: Reference species-dimensioned property for initial diagnostic output
Description: If all required properties are set, the EDC model will print the adiabatic flame temperature and heat of combustion for the mechanism defined by the specified fuel.

Parameter	Value	Default
Property	string	–
SpeciesName	string	–
{=}	{= \| are \| is}	–
Value	real	–

7.38.1.3.2. Oxidizer Mixture Specification

Scope: Edc Model Specification
Summary: Specify either mass fractions or mole fractions for the oxidizer mixture. Only non-zero species need to be included, and the mass or mole fractions must sum to unity. The default is air, with a 0.2095:0.7905 molar ratio between O2 and N2.

begin Oxidizer Mixture Specification OxMixName

   Mass_Fraction SpeciesName {=} Value

   Mole_Fraction SpeciesName {=} Value

end Oxidizer Mixture Specification OxMixName

Line Commands

Mass_Fraction

Syntax: Mass_Fraction SpeciesName {=} Value
Summary: Oxidizer mixture mass fraction for the given species

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

Mole_Fraction

Syntax: Mole_Fraction SpeciesName {=} Value
Summary: Oxidizer mixture mole fraction for the given species

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

7.38.1.4. Hdiff Model Specification

Scope: Solution Options
Summary: Specify hydrogen diffusion model options

begin Hdiff Model Specification HdiffOptionsName

   Use Reference System Flux {=} {false | no | off | on | true | yes}

end Hdiff Model Specification HdiffOptionsName

7.38.1.4.1. Line Commands

Use Reference System Flux

Syntax: Use Reference System Flux {=} {false | no | off | on | true | yes}
Summary: Use flux defined in the reference (if true) or current (if false) coordinate system.
Description: If the hydrogen flux is written in the current configuration coordinate system, the formulation includes a tensor multiplication by the inverse right Cauchy-Green tensor. This gives the most accurate formulation when the entire equation is being solved in the current configuration. If the flux is written in the reference system (i.e. the parameter value is “true”), no such tensor multiplication is included.

Parameter	Value	Default
{=}	{= \| are \| is}	–
useReferenceFlux	{false \| no \| off \| on \| true \| yes}	TRUE

7.38.1.5. Porous Flow Options

Scope: Solution Options
Summary: Specify solution options for porous flow.

begin Porous Flow Options blockName

   Integrate Advection By Parts {=} {false | no | off | on | true | yes}

   Use Cvfem {=} {false | no | off | on | true | yes}

end Porous Flow Options blockName

7.38.1.5.1. Line Commands

Integrate Advection By Parts

Syntax: Integrate Advection By Parts {=} {false | no | off | on | true | yes}
Summary: Do you wish to integrate the advection associated with porous flow species by parts?

Parameter	Value	Default
{=}	{= \| are \| is}	–
integrate_advection_by_parts	{false \| no \| off \| on \| true \| yes}	–

Use Cvfem

Syntax

Use Cvfem {=} {false | no | off | on | true | yes}

Summary

Specify whether to use CVFEM or Galerkin discretization.

Default is Galerkin.

Parameter	Value	Default
{=}	{= \| are \| is}	–
use_cvfem	{false \| no \| off \| on \| true \| yes}	–

7.38.1.6. Species Options

Scope: Solution Options
Summary: Specify solution options for species equations

begin Species Options blockName

   Use Cvfem {=} {false | no | off | on | true | yes}

end Species Options blockName

7.38.1.6.1. Line Commands

Use Cvfem

Syntax: Use Cvfem {=} {false | no | off | on | true | yes}
Summary: Specify whether to use CVFEM or Galerkin discretization. Default is Galerkin.

Parameter	Value	Default
{=}	{= \| are \| is}	–
use_cvfem	{false \| no \| off \| on \| true \| yes}	–

7.38.1.7. Turbulence Model Specification

Scope: Solution Options
Summary: Specify turbulence modeling options.

begin Turbulence Model Specification TurbSpecName

   Activate Cvfem Lumped Turbulent Source Term Algorithm

   Activate Kepsilon Source Term Trickster Linearization

   Activate New Komega Src Linearization

   Activate Rhs Sdr Sensitivities To {dens_sens | sdr_sens | tke_sens | turb_prod_sens | tvisc_sens}

   Activate Rhs Tke Sensitivities To {dens_sens | sdr_sens | tke_sens | turb_prod_sens | tvisc_sens}

   Activate Turbulence Clipping Utility At {begin_nonlinear_solve | end_nonlinear_solve | manually_run | post_iterate | post_linear_solve | post_nonlinear_solve | pre_iterate | pre_linear_solve | pre_nonlinear_solve | run_initially | run_once | run_post_linear_system_initialization}

   Implicit Les Filter Scale {=} Value

   Limit Turbulent Ke Production To Value Times Dissipation

   Omit Finite Difference Sensitivity Due To Utau

   Omit Sensitivities In Turbulent Production Term

   Omit Sensitivities To Turbulent Production From Ke Source Only

   Omit Velocity Divergence In Turbulent Production Term

   Time Filter {=} Value

   Turbulence Model {=} {dsmag | kepsilon | komega | ksgs | laminar | sarans | smag | sst}

   Turbulence Model Parameter {a_1 | beta | beta_1 | beta_star | c_epsilon | c_epsilon_1 | c_epsilon_2 | c_mu | c_mu_cs | c_mu_epsilon | edc_c_gamma_lam | edc_c_lam_trans | edc_c_tau_lam | gamma | gamma_1 | kappa | lr_omega | minimum_turbulent_viscosity | pr_t | ramp_time | sa_cb1 | sa_cb2 | sa_cv1 | sa_cw2 | sa_cw3 | sa_sigma | sc_t | sigma_epsilon_lam | sigma_epsilon_trb | sigma_k1_trb | sigma_k_lam | sigma_k_trb | sigma_omega1_trb | sigma_omega_lam | sigma_omega_trb | von_karman | wall_length_factor | y_plus_crit} {=} Value

end Turbulence Model Specification TurbSpecName

7.38.1.7.1. Line Commands

Activate Cvfem Lumped Turbulent Source Term Algorithm

Syntax: Activate Cvfem Lumped Turbulent Source Term Algorithm
Summary: Lump cvfem turbulent ke, tdr and ksgs rhs source terms
Description: This is appropriate for CVFEM only as it uses a special flavor of lumping source terms.

Activate Kepsilon Source Term Trickster Linearization

Syntax: Activate Kepsilon Source Term Trickster Linearization
Summary: Follow classic Patankar approach to linearization of k rhs
Description: The dissipation rate in the k equation includes sensitivities to k by using the Prandtl Kolmorgorov relationship to for the model for of the dissipation rate. This procedure provides additional diagonal dominance for the k rhs source term.

Activate New Komega Src Linearization

Syntax: Activate New Komega Src Linearization
Summary: Alternate komega src linearization
Description: Alt komega src linearization

Activate Rhs Sdr Sensitivities To

Syntax: Activate Rhs Sdr Sensitivities To {dens_sens | sdr_sens | tke_sens | turb_prod_sens | tvisc_sens}
Summary: Dial in rhs sens for sdr equation

Parameter	Value	Default
TurbSensParams	{dens_sens \| sdr_sens \| tke_sens \| turb_prod_sens \| tvisc_sens}	–

Activate Rhs Tke Sensitivities To

Syntax: Activate Rhs Tke Sensitivities To {dens_sens | sdr_sens | tke_sens | turb_prod_sens | tvisc_sens}
Summary: Dial in rhs sens for tke equation

Parameter	Value	Default
TurbSensParams	{dens_sens \| sdr_sens \| tke_sens \| turb_prod_sens \| tvisc_sens}	–

Activate Turbulence Clipping Utility At

Syntax: Activate Turbulence Clipping Utility At {begin_nonlinear_solve | end_nonlinear_solve | manually_run | post_iterate | post_linear_solve | post_nonlinear_solve | pre_iterate | pre_linear_solve | pre_nonlinear_solve | run_initially | run_once | run_post_linear_system_initialization}
Summary: Activate clipping utility for turbulence quantities
Description: Sometimes it helps to clip the turbulence quantities. This is a utility that provides this support.

Parameter	Value	Default
UtilClipLocation	{begin_nonlinear_solve \| end_nonlinear_solve \| manually_run \| post_iterate \| post_linear_solve \| post_nonlinear_solve \| pre_iterate \| pre_linear_solve \| pre_nonlinear_solve \| run_initially \| run_once \| run_post_linear_system_initialization}	–

Implicit Les Filter Scale

Syntax: Implicit Les Filter Scale {=} Value
Summary: Provide implicit filter length
Description: In constant coefficient LES models, allow the user to specify and implicit filter length. The default is to determine a length scale tied to the mesh.

Parameter	Value	Default
{=}	{= \| are \| is}	–
Value	real	–

Limit Turbulent Ke Production

Syntax: Limit Turbulent Ke Production To Value Times Dissipation
Summary: Choose to limit production source terms
Description: This option limits the turbulent ke production to a scale factor of dissipation, prod = min(prod, limit*den*en1). In practice, the ratio of production to dissipation is not very high. In some flows, it is useful to specify a value of approximately 1000. The ratio should be checked as part of the analysis to make sure that violation of the physical ratio has not been done. In general, this option is only activated in domain locations where dissipation rate is very small.

Parameter	Value	Default
Value	real	1.0e-8

Omit Finite Difference Sensitivity Due To Utau

Syntax: Omit Finite Difference Sensitivity Due To Utau
Summary: Omit FD sensitivity from utau
Description: The wall friction velocity, utau, can be complex to evaluate in the context of the law of the wall. The default is to compute sensitivities via finite difference. Sometimes, this seems to add some overhead and spurious sensitivities.

Omit Sensitivities In Turbulent Production Term

Syntax: Omit Sensitivities In Turbulent Production Term
Summary: Do not include sensitivities for turbulence production
Description: This option removes the analytical sensitivities for the production of turbulent kinetic energy. It seems that most simulations are more stable if this option is activated.

Omit Sensitivities To Turbulent Production From Ke Source Only

Syntax: Omit Sensitivities To Turbulent Production From Ke Source Only
Summary: Omit sensitivities to turbulence production from the KE source term
Description: This option removes the analytical sensitivities for the production of turbulent kinetic energy in the KE source terms (where they may be destabilizing) but retains them elsewhere (where they may be helpful). Mutually exclusive w/ the previous option.

Omit Velocity Divergence In Turbulent Production Term

Syntax: Omit Velocity Divergence In Turbulent Production Term
Summary: Do not include divergence term in turbulence production
Description: This option removes the divergence term from the turbulent production of kinetic energy. The default is to include this term.

Time Filter

Syntax: Time Filter {=} Value
Summary: Time filter size for Time Filtered Navier-Stokes model
Description: Turbulent viscosity is normally calculated based on a time scale given by k/epsilon (for k-epsilon models) or T (v2f model). The TFNS model substitutes the minimum of the normal computed value and the user-specified time filter size in the turbulent viscosity calculation. In general, this filter should be no less than twice the physical time step. A non-fatal warning is issued if this condition is violated.

Parameter	Value	Default
{=}	{= \| are \| is}	–
Value	real	1.0e32

Turbulence Model

Syntax: Turbulence Model {=} {dsmag | kepsilon | komega | ksgs | laminar | sarans | smag | sst}
Summary: Specify type of turbulence model to be used

Parameter	Value	Default
{=}	{= \| are \| is}	–
TurbulenceModel	{dsmag \| kepsilon \| komega \| ksgs \| laminar \| sarans \| smag \| sst}	–

Turbulence Model Parameter

Syntax: Turbulence Model Parameter {a_1 | beta | beta_1 | beta_star | c_epsilon | c_epsilon_1 | c_epsilon_2 | c_mu | c_mu_cs | c_mu_epsilon | edc_c_gamma_lam | edc_c_lam_trans | edc_c_tau_lam | gamma | gamma_1 | kappa | lr_omega | minimum_turbulent_viscosity | pr_t | ramp_time | sa_cb1 | sa_cb2 | sa_cv1 | sa_cw2 | sa_cw3 | sa_sigma | sc_t | sigma_epsilon_lam | sigma_epsilon_trb | sigma_k1_trb | sigma_k_lam | sigma_k_trb | sigma_omega1_trb | sigma_omega_lam | sigma_omega_trb | von_karman | wall_length_factor | y_plus_crit} {=} Value
Summary: Turbulence model parameters

Parameter	Value	Default
TurbParams	{a_1 \| beta \| beta_1 \| beta_star \| c_epsilon \| c_epsilon_1 \| c_epsilon_2 \| c_mu \| c_mu_cs \| c_mu_epsilon \| edc_c_gamma_lam \| edc_c_lam_trans \| edc_c_tau_lam \| gamma \| gamma_1 \| kappa \| lr_omega \| minimum_turbulent_viscosity \| pr_t \| ramp_time \| sa_cb1 \| sa_cb2 \| sa_cv1 \| sa_cw2 \| sa_cw3 \| sa_sigma \| sc_t \| sigma_epsilon_lam \| sigma_epsilon_trb \| sigma_k1_trb \| sigma_k_lam \| sigma_k_trb \| sigma_omega1_trb \| sigma_omega_lam \| sigma_omega_trb \| von_karman \| wall_length_factor \| y_plus_crit}	–
{=}	{= \| are \| is}	–
Value	real	–