Kernels System

A "Kernel" is a piece of physics. It can represent one or more operators or terms in the weak form of a partial differential equation. With all terms on the left-hand-side, their sum is referred to as the "residual". The residual is evaluated at several integration quadrature points over the problem domain. To implement your own physics in MOOSE, you create your own kernel by subclassing the MOOSE Kernel class.

In a Kernel subclass the computeQpResidual() function must be overridden. This is where you implement your PDE weak form terms. The following member functions can optionally be overridden:

• computeQpJacobian()

• computeQpOffDiagJacobian()

These two functions provide extra information that can help the numerical solver(s) converge faster and better. Inside your Kernel class, you have access to several member variables for computing the residual and Jacobian values in the above mentioned functions:

• _i, _j: indices for the current test and trial shape functions respectively.

• _qp: current quadrature point index.

• _u, _grad_u: value and gradient of the variable this Kernel operates on; indexed by _qp (i.e. _u[_qp]).

• _test, _grad_test: value () and gradient () of the test functions at the q-points; indexed by _i and then _qp (i.e., _test[_i][_qp]).

• _phi, _grad_phi: value () and gradient () of the trial functions at the q-points; indexed by _j and then _qp (i.e., _phi[_j][_qp]).

• _q_point: XYZ coordinates of the current quadrature point.

• _current_elem: pointer to the current element being operated on.

Custom Kernel Creation

To create a custom kernel, you can follow the pattern of the Diffusion kernel implemented and included in the MOOSE framework. Additionally, Example 2 in MOOSE provides a step-by-step overview of creating your own custom kernel.

The strong-form of the diffusion equations is defined on a 3-D domain as: find such that

(1) where is defined as the boundary on which the value of is fixed to a known constant , is defined as the boundary on which the flux across the boundary is fixed to a known constant , and $\hat{n} is the boundary outward normal. The weak form is generated by multiplying by a test function () and integrating over the domain (using inner-product notation): (2) and then integrating by parts which gives the weak form: (3) where is known as the trial function that defines the finite element discretization, , with being the basis functions. The Jacobian, which is the derivative of Eq. (3) with respect to , is defined as: (4) The diffusion kernel header and implementation files are:  #pragma once #include "Kernel.h" class Diffusion; template <> InputParameters validParams<Diffusion>(); /** * This kernel implements the Laplacian operator: *$\nabla u \cdot \nabla \phi_i$*/ class Diffusion : public Kernel { public: Diffusion(const InputParameters & parameters); protected: virtual Real computeQpResidual() override; virtual Real computeQpJacobian() override; };  (framework/include/kernels/Diffusion.h)  #include "Diffusion.h" registerMooseObject("MooseApp", Diffusion); template <> InputParameters validParams<Diffusion>() { InputParameters params = validParams<Kernel>(); params.addClassDescription("The Laplacian operator ($-\\nabla \\cdot \\nabla u$), with the weak " "form of$(\\nabla \\phi_i, \\nabla u_h)$."); return params; } Diffusion::Diffusion(const InputParameters & parameters) : Kernel(parameters) {} Real Diffusion::computeQpResidual() { return _grad_u[_qp] * _grad_test[_i][_qp]; } Real Diffusion::computeQpJacobian() { return _grad_phi[_j][_qp] * _grad_test[_i][_qp]; }  (framework/src/kernels/Diffusion.C) Before a custom physics kernel is available for use, it must be registered in your application. This is done in e.g. src/base/YourApp.C for the YourApp application.  // src/base/YourApp.C contents #include "YourKernel.h" ... int YourApp::registerObjects(Factory & factory) { ... registerKernel(YourKernel); ... } ...  Time Derivative Kernels You can create a time-derivative term/kernel by subclassing TimeKernel instead of Kernel. For example, the residual contribution for a time derivative term is: (5) where is the finite element solution, and (6) because you can interchange the order of differentiation and summation. In the equation above, is the time derivative of the th finite element coefficient of . While the exact form of this derivative depends on the time stepping scheme, without much loss of generality, we can assume the following form for the time derivative: (7) for some constants , which depend on and the timestepping method. The derivative of equation Eq. (6) with respect to is then: (8) So that the Jacobian term for equation Eq. (6) is (9) where is what we call du_dot_du in MOOSE. Therefore the computeQpResidual() function for our time-derivative term kernel looks like: text cpp return _test[_i][_qp] * _u_dot[_qp];  And the corresponding computeQpJacobian() is:  return _test[_i][_qp] * _phi[_j][_qp] * _du_dot_du[_qp];  Further Kernel Documentation Several specialized kernel types exist in MOOSE each with useful functionality. Details for each are in the sections below. Available Objects • Moose App • ADBodyForceDemonstrates the multiple ways that scalar values can be introduced into kernels, e.g. (controllable) constants, functions, and postprocessors. Implements the weak form . • ADCoupledTimeDerivativeTime derivative Kernel that acts on a coupled variable. Weak form: . • ADDiffusionSame as Diffusion in terms of physics/residual, but the Jacobian is computed using forward automatic differentiation • ADTimeDerivativeThe time derivative operator with the weak form of . • ADVectorDiffusionThe Laplacian operator (), with the weak form of . The Jacobian is computed using automatic differentiation • ADVectorTimeDerivativeThe time derivative operator with the weak form of . • AnisotropicDiffusionAnisotropic diffusion kernel with weak form given by . • BodyForceDemonstrates the multiple ways that scalar values can be introduced into kernels, e.g. (controllable) constants, functions, and postprocessors. Implements the weak form . • CoefTimeDerivativeThe time derivative operator with the weak form of . • ConservativeAdvectionConservative form of which in its weak form is given by: . • CoupledForceImplements a source term proportional to the value of a coupled variable. Weak form: . • CoupledTimeDerivativeTime derivative Kernel that acts on a coupled variable. Weak form: . • DiffusionThe Laplacian operator (), with the weak form of . • MassEigenKernelAn eigenkernel with weak form where is the eigenvalue. • MassLumpedTimeDerivativeLumped formulation of the time derivative . Its corresponding weak form is where denotes the time derivative of the solution coefficient associated with node . • MatDiffusionDiffusion equation Kernel that takes an isotropic Diffusivity from a material property • MaterialDerivativeRankFourTestKernelClass used for testing derivatives of a rank four tensor material property. • MaterialDerivativeRankTwoTestKernelClass used for testing derivatives of a rank two tensor material property. • MaterialDerivativeTestKernelClass used for testing derivatives of a scalar material property. • NullKernelKernel that sets a zero residual. • ReactionImplements a simple consuming reaction term with weak form . • TimeDerivativeThe time derivative operator with the weak form of . • UserForcingFunctionDemonstrates the multiple ways that scalar values can be introduced into kernels, e.g. (controllable) constants, functions, and postprocessors. Implements the weak form . • VectorBodyForceDemonstrates the multiple ways that scalar values can be introduced into kernels, e.g. (controllable) constants, functions, and postprocessors. Implements the weak form . • VectorDiffusionThe Laplacian operator (), with the weak form of . • Phase Field App • ACBarrierFunctionAllen Cahn kernel used when 'mu' is a function of variables • ACGBPolyGrain-Boundary model concentration dependent residual • ACGrGrElasticDrivingForceAdds elastic energy contribution to the Allen-Cahn equation • ACGrGrMultiMulti-phase poly-crystaline Allen-Cahn Kernel • ACGrGrPolyGrain-Boundary model poly-crystaline interface Allen-Cahn Kernel • ACInterfaceGradient energy Allen-Cahn Kernel • ACInterface2DMultiPhase1Gradient energy Allen-Cahn Kernel where the derivative of interface parameter kappa wrt the gradient of order parameter is considered. • ACInterface2DMultiPhase2Gradient energy Allen-Cahn Kernel where the interface parameter kappa is considered. • ACInterfaceKobayashi1Anisotropic gradient energy Allen-Cahn Kernel Part 1 • ACInterfaceKobayashi2Anisotropic Gradient energy Allen-Cahn Kernel Part 2 • ACInterfaceStressInterface stress driving force Allen-Cahn Kernel • ACKappaFunctionGradient energy term for when kappa as a function of the variable • ACMultiInterfaceGradient energy Allen-Cahn Kernel with cross terms • ACSEDGPolyStored Energy contribution to grain growth • ACSwitchingKernel for Allen-Cahn equation that adds derivatives of switching functions and energies • ADACInterfaceGradient energy Allen-Cahn Kernel • ADAllenCahnAllen-Cahn Kernel that uses a DerivativeMaterial Free Energy • ADSplitCHParsedSplit formulation Cahn-Hilliard Kernel that uses a DerivativeMaterial Free Energy • ADSplitCHWResSplit formulation Cahn-Hilliard Kernel for the chemical potential variable with a scalar (isotropic) mobility • ADSplitCHWResAnisoSplit formulation Cahn-Hilliard Kernel for the chemical potential variable with a scalar (isotropic) mobility • AllenCahnAllen-Cahn Kernel that uses a DerivativeMaterial Free Energy • AllenCahnElasticEnergyOffDiagThis kernel calculates off-diagonal jacobian of elastic energy in AllenCahn with respect to displacements • CHBulkPFCTradCahn-Hilliard kernel for a polynomial phase field crystal free energy. • CHInterfaceGradient energy Cahn-Hilliard Kernel with a scalar (isotropic) mobility • CHInterfaceAnisoGradient energy Cahn-Hilliard Kernel with a tensor (anisotropic) mobility • CHMathSimple demonstration Cahn-Hilliard Kernel using an algebraic double-well potential • CHPFCRFFCahn-Hilliard residual for the RFF form of the phase field crystal model • CHSplitChemicalPotentialChemical potential kernel in Split Cahn-Hilliard that solves chemical potential in a weak form • CHSplitConcentrationConcentration kernel in Split Cahn-Hilliard that solves chemical potential in a weak form • CHSplitFluxComputes flux as nodal variable • CahnHilliardCahn-Hilliard Kernel that uses a DerivativeMaterial Free Energy and a scalar (isotropic) mobility • CahnHilliardAnisoCahn-Hilliard Kernel that uses a DerivativeMaterial Free Energy and a tensor (anisotropic) mobility • CoefCoupledTimeDerivativeScaled time derivative Kernel that acts on a coupled variable • CoefReactionImplements the residual term (p*u, test) • ConservedLangevinNoiseSource term for noise from a ConservedNoise userobject • CoupledAllenCahnCoupled Allen-Cahn Kernel that uses a DerivativeMaterial Free Energy • CoupledMaterialDerivativeKernel that implements the first derivative of a function material property with respect to a coupled variable. • CoupledSusceptibilityTimeDerivativeA modified coupled time derivative Kernel that multiplies the time derivative of a coupled variable by a generalized susceptibility • CoupledSwitchingTimeDerivativeCoupled time derivative Kernel that multiplies the time derivative by$\frac{dh_\alpha}{d\eta_i} F_\alpha + \frac{dh_\beta}{d\eta_i} F_\beta + \dots)
• DiscreteNucleationForceTerm for inserting grain nuclei or phases in non-conserved order parameter fields
• GradientComponentSet the kernel variable to a specified component of the gradient of a coupled variable.
• HHPFCRFFReaction type kernel for the RFF phase fit crystal model
• KKSACBulkCKKS model kernel (part 2 of 2) for the Bulk Allen-Cahn. This includes all terms dependent on chemical potential.
• KKSACBulkFKKS model kernel (part 1 of 2) for the Bulk Allen-Cahn. This includes all terms NOT dependent on chemical potential.
• KKSCHBulkKKS model kernel for the Bulk Cahn-Hilliard term. This operates on the concentration 'c' as the non-linear variable
• KKSMultiACBulkCMulti-phase KKS model kernel (part 2 of 2) for the Bulk Allen-Cahn. This includes all terms dependent on chemical potential.
• KKSMultiACBulkFKKS model kernel (part 1 of 2) for the Bulk Allen-Cahn. This includes all terms NOT dependent on chemical potential.
• KKSMultiPhaseConcentrationKKS multi-phase model kernel to enforce . The non-linear variable of this kernel is , the final phase concentration in the list.
• KKSPhaseChemicalPotentialKKS model kernel to enforce the pointwise equality of phase chemical potentials dFa/dca = dFb/dcb. The non-linear variable of this kernel is ca.
• KKSPhaseConcentrationKKS model kernel to enforce the decomposition of concentration into phase concentration (1-h(eta))ca + h(eta)cb - c = 0. The non-linear variable of this kernel is cb.
• KKSSplitCHCResKKS model kernel for the split Bulk Cahn-Hilliard term. This operates on the chemical potential 'c' as the non-linear variable
• LangevinNoiseSource term for non-conserved Langevin noise
• LaplacianSplitSplit with a variable that holds the Laplacian of a phase field variable.
• MaskedBodyForceKernel that defines a body force modified by a material mask
• MatAnisoDiffusionDiffusion equation Kernel that takes an anisotropic Diffusivity from a material property
• MatReactionKernel to add -L*v, where L=reaction rate, v=variable
• MultiGrainRigidBodyMotionAdds rigid mody motion to grains
• SimpleACInterfaceGradient energy for Allen-Cahn Kernel with constant Mobility and Interfacial parameter
• SimpleCHInterfaceGradient energy for Cahn-Hilliard equation with constant Mobility and Interfacial parameter
• SimpleCoupledACInterfaceGradient energy for Allen-Cahn Kernel with constant Mobility and Interfacial parameter for a coupled order parameter variable.
• SimpleSplitCHWResGradient energy for split Cahn-Hilliard equation with constant Mobility for a coupled order parameter variable.
• SingleGrainRigidBodyMotionAdds rigid mody motion to a single grain
• SoretDiffusionAdd Soret effect to Split formulation Cahn-Hilliard Kernel
• SplitCHMathSimple demonstration split formulation Cahn-Hilliard Kernel using an algebraic double-well potential
• SplitCHParsedSplit formulation Cahn-Hilliard Kernel that uses a DerivativeMaterial Free Energy
• SplitCHWResSplit formulation Cahn-Hilliard Kernel for the chemical potential variable with a scalar (isotropic) mobility
• SplitCHWResAnisoSplit formulation Cahn-Hilliard Kernel for the chemical potential variable with a tensor (anisotropic) mobility
• SusceptibilityTimeDerivativeA modified time derivative Kernel that multiplies the time derivative of a variable by a generalized susceptibility
• SwitchingFunctionConstraintEtaLagrange multiplier kernel to constrain the sum of all switching functions in a multiphase system. This kernel acts on a non-conserved order parameter eta_i.
• SwitchingFunctionConstraintLagrangeLagrange multiplier kernel to constrain the sum of all switching functions in a multiphase system. This kernel acts on the lagrange multiplier variable.
• SwitchingFunctionPenaltyPenalty kernel to constrain the sum of all switching functions in a multiphase system.
• Misc App
• ADMatDiffusionSame as Diffusion in terms of physics/residual, but the Jacobian is computed using forward automatic differentiation
• CoefDiffusionKernel for diffusion with diffusivity = coef + function
• ThermoDiffusionKernel for thermo-diffusion (Soret effect, thermophoresis, etc.)
• Level Set App
• LevelSetAdvectionImplements the level set advection equation: , where the weak form is .
• LevelSetAdvectionSUPGSUPG stablization term for the advection portion of the level set equation.
• LevelSetForcingFunctionSUPGThe SUPG stablization term for a forcing function.
• LevelSetOlssonReinitializationThe re-initialization equation defined by Olsson et. al. (2007).
• LevelSetTimeDerivativeSUPGSUPG stablization terms for the time derivative of the level set equation.
• XFEMApp
• CrackTipEnrichmentStressDivergenceTensorsEnrich stress divergence kernel for small-strain simulations
• Heat Conduction App
• ADHeatConductionSame as Diffusion in terms of physics/residual, but the Jacobian is computed using forward automatic differentiation
• ADHeatConductionTimeDerivativeAD Time derivative term of the heat equation for quasi-constant specific heat and the density .
• AnisoHeatConduction
• HeatCapacityConductionTimeDerivativeTime derivative term of the heat equation with the heat capacity as an argument.
• HeatConductionComputes residual/Jacobian contribution for term.
• HeatConductionTimeDerivativeTime derivative term of the heat equation for quasi-constant specific heat and the density .
• HeatSourceDemonstrates the multiple ways that scalar values can be introduced into kernels, e.g. (controllable) constants, functions, and postprocessors. Implements the weak form .
• HomogenizedHeatConduction
• JouleHeatingSourceDemonstrates the multiple ways that scalar values can be introduced into kernels, e.g. (controllable) constants, functions, and postprocessors. Implements the weak form .
• SpecificHeatConductionTimeDerivativeTime derivative term of the heat equation with the specific heat and the density as arguments.
• Tensor Mechanics App
• ADGravityApply gravity. Value is in units of acceleration.
• ADStressDivergenceRSphericalTensorsCalculate stress divergence for a spherically symmetric 1D problem in polar coordinates.
• ADStressDivergenceRZTensorsCalculate stress divergence for an axisymmetric problem in cylindrical coordinates.
• ADStressDivergenceTensorsStress divergence kernel with automatic differentiation for the Cartesian coordinate system
• CosseratStressDivergenceTensorsStress divergence kernel for the Cartesian coordinate system
• DynamicStressDivergenceTensorsResidual due to stress related Rayleigh damping and HHT time integration terms
• GeneralizedPlaneStrainOffDiagGeneralized Plane Strain kernel to provide contribution of the out-of-plane strain to other kernels
• GravityApply gravity. Value is in units of acceleration.
• InertialForceCalculates the residual for the interial force () and the contribution of mass dependent Rayleigh damping and HHT time integration scheme ($\eta \cdot M \cdot ((1+\alpha)velq2-\alpha \cdot vel-old)$)
• InertialForceBeamCalculates the residual for the interial force/moment and the contribution of mass dependent Rayleigh damping and HHT time integration scheme.
• InertialTorqueKernel for interial torque: density * displacement x acceleration
• MomentBalancing
• OutOfPlanePressureApply pressure in the out-of-plane direction in 2D plane stress or generalized plane strain models
• PhaseFieldFractureMechanicsOffDiagStress divergence kernel for phase-field fracture: Computes off diagonal damage dependent Jacobian components. To be used with StressDivergenceTensors or DynamicStressDivergenceTensors.
• PlasticHeatEnergyPlastic heat energy density = coeff * stress * plastic_strain_rate
• PoroMechanicsCouplingAdds , where the subscript is the component.
• StressDivergenceBeamQuasi-static and dynamic stress divergence kernel for Beam element
• StressDivergenceRSphericalTensorsCalculate stress divergence for a spherically symmetric 1D problem in polar coordinates.
• StressDivergenceRZTensorsCalculate stress divergence for an axisymmetric problem in cylindrical coordinates.
• StressDivergenceTensorsStress divergence kernel for the Cartesian coordinate system
• StressDivergenceTensorsTrussKernel for truss element
• WeakPlaneStressPlane stress kernel to provide out-of-plane strain contribution
• Porous Flow App
• FluxLimitedTVDAdvectionConservative form of (advection), using the Flux Limited TVD scheme invented by Kuzmin and Turek
• PorousFlowBasicAdvectionAdvective flux of a Variable using the Darcy velocity of the fluid phase
• PorousFlowDesorpedMassTimeDerivativeDesorped component mass derivative wrt time.
• PorousFlowDesorpedMassVolumetricExpansionDesorped_mass * rate_of_solid_volumetric_expansion
• PorousFlowDispersiveFluxDispersive and diffusive flux of the component given by fluid_component in all phases
• PorousFlowEffectiveStressCouplingAdds , where the subscript is the component.
• PorousFlowEnergyTimeDerivativeDerivative of heat-energy-density wrt time
• PorousFlowExponentialDecayResidual = rate * (variable - reference). Useful for modelling exponential decay of a variable
• PorousFlowFluxLimitedTVDAdvectionAdvective flux of fluid species or heat using the Flux Limited TVD scheme invented by Kuzmin and Turek
• PorousFlowFullySaturatedDarcyBaseDarcy flux suitable for models involving a fully-saturated, single phase, single component fluid. No upwinding is used
• PorousFlowFullySaturatedDarcyFlowDarcy flux suitable for models involving a fully-saturated single phase, multi-component fluid. No upwinding is used
• PorousFlowFullySaturatedHeatAdvectionHeat flux that arises from the advection of a fully-saturated single phase fluid. No upwinding is used
• PorousFlowFullySaturatedMassTimeDerivativeFully-saturated version of the single-component, single-phase fluid mass derivative wrt time
• PorousFlowHeatConductionHeat conduction in the Porous Flow module
• PorousFlowHeatVolumetricExpansionEnergy-density*rate_of_solid_volumetric_expansion
• PorousFlowMassTimeDerivativeComponent mass derivative wrt time for component given by fluid_component
• PorousFlowMassVolumetricExpansionComponent_mass*rate_of_solid_volumetric_expansion
• PorousFlowPlasticHeatEnergyPlastic heat energy density source = (1 - porosity) * coeff * stress * plastic_strain_rate
• PorousFlowPreDisPrecipitation-dissolution of chemical species
• Navier Stokes App
• DistributedForce
• DistributedPower
• INSADMassThis class computes the mass equation residual and Jacobian contributions (the latter using automatic differentiation) for the incompressible Navier-Stokes equations.
• INSADMassPSPGThis class adds PSPG stabilization to the mass equation, enabling use of equal order shape functions for pressure and velocity variables
• INSADMomentumTimeDerivativeThis class computes the time derivative for the incompressible Navier-Stokes momentum equation.
• INSADTemperatureAdvectionThis class computes the residual and Jacobian contributions for temperature advection for a divergence free velocity field.
• INSADTemperatureAdvectionSUPGThis class computes the residual and Jacobian contributions for SUPG stabilization of temperature advection for a divergence free velocity field.
• INSChorinCorrectorThis class computes the 'Chorin' Corrector equation in fully-discrete (both time and space) form.
• INSChorinPredictorThis class computes the 'Chorin' Predictor equation in fully-discrete (both time and space) form.
• INSChorinPressurePoissonThis class computes the pressure Poisson solve which is part of the 'split' scheme used for solving the incompressible Navier-Stokes equations.
• INSCompressibilityPenaltyThe penalty term may be used when Dirichlet boundary condition is applied to the entire boundary.
• INSMassThis class computes the mass equation residual and Jacobian contributions for the incompressible Navier-Stokes momentum equation.
• INSMassRZThis class computes the mass equation residual and Jacobian contributions for the incompressible Navier-Stokes momentum equation in RZ coordinates.
• INSMomentumLaplaceFormThis class computes momentum equation residual and Jacobian viscous contributions for the 'Laplacian' form of the governing equations.
• INSMomentumLaplaceFormRZThis class computes additional momentum equation residual and Jacobian contributions for the incompressible Navier-Stokes momentum equation in RZ (axisymmetric cylindrical) coordinates, using the 'Laplace' form of the governing equations.
• INSMomentumTimeDerivativeThis class computes the time derivative for the incompressible Navier-Stokes momentum equation.
• INSMomentumTractionFormThis class computes momentum equation residual and Jacobian viscous contributions for the 'traction' form of the governing equations.
• INSMomentumTractionFormRZThis class computes additional momentum equation residual and Jacobian contributions for the incompressible Navier-Stokes momentum equation in RZ (axisymmetric cylindrical) coordinates.
• INSPressurePoissonThis class computes the pressure Poisson solve which is part of the 'split' scheme used for solving the incompressible Navier-Stokes equations.
• INSProjectionThis class computes the 'projection' part of the 'split' method for solving incompressible Navier-Stokes.
• INSSplitMomentumThis class computes the 'split' momentum equation residual.
• INSTemperatureThis class computes the residual and Jacobian contributions for the incompressible Navier-Stokes temperature (energy) equation.
• INSTemperatureTimeDerivativeThis class computes the time derivative for the incompressible Navier-Stokes momentum equation.
• MassConvectiveFlux
• MomentumConvectiveFlux
• NSEnergyInviscidFluxThis class computes the inviscid part of the energy flux.
• NSEnergyThermalFluxThis class is responsible for computing residuals and Jacobian terms for the k * grad(T) * grad(phi) term in the Navier-Stokes energy equation.
• NSEnergyViscousFluxViscous flux terms in energy equation.
• NSGravityForceThis class computes the gravity force contribution.
• NSGravityPowerThis class computes the momentum contributed by gravity.
• NSMassInviscidFluxThis class computes the inviscid flux in the mass equation.
• NSMomentumInviscidFluxThe inviscid flux (convective + pressure terms) for the momentum conservation equations.
• NSMomentumInviscidFluxWithGradPThis class computes the inviscid flux with pressure gradient in the momentum equation.
• NSMomentumViscousFluxDerived instance of the NSViscousFluxBase class for the momentum equations.
• NSSUPGEnergyCompute residual and Jacobian terms form the SUPG terms in the energy equation.
• NSSUPGMassCompute residual and Jacobian terms form the SUPG terms in the mass equation.
• NSSUPGMomentumCompute residual and Jacobian terms form the SUPG terms in the momentum equation.
• NSTemperatureL2This class was originally used to solve for the temperature using an L2-projection.