Initial commit

applications/solvers/combustion/PDRFoam/PDRModels/dragModels/PDRDragModel/PDRDragModel.H

+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | www.openfoam.com
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+    Copyright (C) 2011-2015 OpenFOAM Foundation
+-------------------------------------------------------------------------------
+License
+    This file is part of OpenFOAM.
+
+    OpenFOAM is free software: you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
+
+Class
+    Foam::PDRDragModel
+
+Description
+    Base-class for sub-grid obstacle drag models. The available drag model is at
+    \link basic.H \endlink.
+
+SourceFiles
+    PDRDragModel.C
+
+\*---------------------------------------------------------------------------*/
+
+#ifndef PDRDragModel_H
+#define PDRDragModel_H
+
+#include "IOdictionary.H"
+#include "psiuReactionThermo.H"
+#include "turbulentFluidThermoModel.H"
+#include "multivariateSurfaceInterpolationScheme.H"
+#include "runTimeSelectionTables.H"
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+namespace Foam
+{
+
+/*---------------------------------------------------------------------------*\
+                          Class PDRDragModel Declaration
+\*---------------------------------------------------------------------------*/
+
+class PDRDragModel
+:
+    public regIOobject
+{
+
+protected:
+
+    // Protected data
+
+        dictionary PDRDragModelCoeffs_;
+
+        const compressible::RASModel& turbulence_;
+        const volScalarField& rho_;
+        const volVectorField& U_;
+        const surfaceScalarField& phi_;
+
+        bool on_;
+
+
+private:
+
+    // Private Member Functions
+
+        //- No copy construct
+        PDRDragModel(const PDRDragModel&) = delete;
+
+        //- No copy assignment
+        void operator=(const PDRDragModel&) = delete;
+
+
+public:
+
+    //- Runtime type information
+    TypeName("PDRDragModel");
+
+
+    // Declare run-time constructor selection table
+
+        declareRunTimeSelectionTable
+        (
+            autoPtr,
+            PDRDragModel,
+            dictionary,
+            (
+                const dictionary& PDRProperties,
+                const compressible::RASModel& turbulence,
+                const volScalarField& rho,
+                const volVectorField& U,
+                const surfaceScalarField& phi
+            ),
+            (
+                PDRProperties,
+                turbulence,
+                rho,
+                U,
+                phi
+            )
+        );
+
+
+    // Selectors
+
+        //- Return a reference to the selected Xi model
+        static autoPtr<PDRDragModel> New
+        (
+            const dictionary& PDRProperties,
+            const compressible::RASModel& turbulence,
+            const volScalarField& rho,
+            const volVectorField& U,
+            const surfaceScalarField& phi
+        );
+
+
+    // Constructors
+
+        //- Construct from components
+        PDRDragModel
+        (
+            const dictionary& PDRProperties,
+            const compressible::RASModel& turbulence,
+            const volScalarField& rho,
+            const volVectorField& U,
+            const surfaceScalarField& phi
+        );
+
+
+    //- Destructor
+    virtual ~PDRDragModel();
+
+
+    // Member Functions
+
+        //- Return true if the drag model is switched on
+        bool on() const
+        {
+            return on_;
+        }
+
+        //- Return the momentum drag coefficient
+        virtual tmp<volSymmTensorField> Dcu() const = 0;
+
+        //- Return the momentum drag turbulence generation rate
+        virtual tmp<volScalarField> Gk() const = 0;
+
+        //- Inherit read from regIOobject
+        using regIOobject::read;
+
+        //- Update properties from given dictionary
+        virtual bool read(const dictionary& PDRProperties) = 0;
+
+        virtual bool writeData(Ostream&) const
+        {
+            return true;
+        }
+
+        virtual void writeFields() const
+        {
+            NotImplemented;
+        }
+};
+
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+} // End namespace Foam
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+#endif
+
+// ************************************************************************* //

applications/solvers/combustion/PDRFoam/PDRModels/dragModels/PDRDragModel/PDRDragModelNew.C

+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | www.openfoam.com
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+    Copyright (C) 2011-2015 OpenFOAM Foundation
+    Copyright (C) 2019-2021 OpenCFD Ltd.
+-------------------------------------------------------------------------------
+License
+    This file is part of OpenFOAM.
+
+    OpenFOAM is free software: you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
+
+\*---------------------------------------------------------------------------*/
+
+#include "PDRDragModel.H"
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+Foam::autoPtr<Foam::PDRDragModel> Foam::PDRDragModel::New
+(
+    const dictionary& dict,
+    const compressible::RASModel& turbulence,
+    const volScalarField& rho,
+    const volVectorField& U,
+    const surfaceScalarField& phi
+)
+{
+    const word modelType(dict.get<word>("PDRDragModel"));
+
+    Info<< "Selecting drag model " << modelType << endl;
+
+    auto* ctorPtr = dictionaryConstructorTable(modelType);
+
+    if (!ctorPtr)
+    {
+        FatalIOErrorInLookup
+        (
+            dict,
+            "PDRDragModel",
+            modelType,
+            *dictionaryConstructorTablePtr_
+        ) << exit(FatalIOError);
+    }
+
+    return autoPtr<PDRDragModel>
+    (
+        ctorPtr(dict, turbulence, rho, U, phi)
+    );
+}
+
+
+// ************************************************************************* //

applications/solvers/combustion/PDRFoam/PDRModels/dragModels/basic/basic.C

+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | www.openfoam.com
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+    Copyright (C) 2011-2016 OpenFOAM Foundation
+-------------------------------------------------------------------------------
+License
+    This file is part of OpenFOAM.
+
+    OpenFOAM is free software: you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
+
+\*---------------------------------------------------------------------------*/
+
+#include "basic.H"
+#include "addToRunTimeSelectionTable.H"
+
+// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
+
+namespace Foam
+{
+namespace PDRDragModels
+{
+    defineTypeNameAndDebug(basic, 0);
+    addToRunTimeSelectionTable(PDRDragModel, basic, dictionary);
+}
+}
+
+
+// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
+
+Foam::PDRDragModels::basic::basic
+(
+    const dictionary& PDRProperties,
+    const compressible::RASModel& turbulence,
+    const volScalarField& rho,
+    const volVectorField& U,
+    const surfaceScalarField& phi
+)
+:
+    PDRDragModel(PDRProperties, turbulence, rho, U, phi),
+    Csu("Csu", dimless, PDRDragModelCoeffs_),
+    Csk("Csk", dimless, PDRDragModelCoeffs_),
+
+    Aw_
+    (
+        IOobject
+        (
+            "Aw",
+            U_.mesh().facesInstance(),
+            U_.mesh(),
+            IOobject::MUST_READ,
+            IOobject::NO_WRITE
+        ),
+        U_.mesh()
+    ),
+
+    CR_
+    (
+        IOobject
+        (
+            "CR",
+            U_.mesh().facesInstance(),
+            U_.mesh(),
+            IOobject::MUST_READ,
+            IOobject::NO_WRITE
+        ),
+        U_.mesh()
+    )
+{}
+
+
+// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
+
+Foam::PDRDragModels::basic::~basic()
+{}
+
+
+// * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * * //
+
+Foam::tmp<Foam::volSymmTensorField> Foam::PDRDragModels::basic::Dcu() const
+{
+    tmp<volSymmTensorField> tDragDcu
+    (
+        new volSymmTensorField
+        (
+            IOobject
+            (
+                "tDragDcu",
+                U_.mesh().time().constant(),
+                U_.mesh(),
+                IOobject::NO_READ,
+                IOobject::NO_WRITE
+            ),
+            U_.mesh(),
+            dimensionedSymmTensor(dimMass/dimTime/dimVolume, Zero)
+        )
+    );
+
+    volSymmTensorField& DragDcu = tDragDcu.ref();
+
+    if (on_)
+    {
+        const volScalarField& betav =
+            U_.db().lookupObject<volScalarField>("betav");
+
+        DragDcu =
+            (0.5*rho_)*CR_*mag(U_) + (Csu*I)*betav*turbulence_.muEff()*sqr(Aw_);
+    }
+
+    return tDragDcu;
+}
+
+
+Foam::tmp<Foam::volScalarField> Foam::PDRDragModels::basic::Gk() const
+{
+    tmp<volScalarField> tGk
+    (
+        new volScalarField
+        (
+            IOobject
+            (
+                "tGk",
+                U_.mesh().time().constant(),
+                U_.mesh(),
+                IOobject::NO_READ,
+                IOobject::NO_WRITE
+            ),
+            U_.mesh(),
+            dimensionedScalar(dimMass/dimLength/pow3(dimTime), Zero)
+        )
+    );
+
+    volScalarField& Gk = tGk.ref();
+
+    if (on_)
+    {
+        const volScalarField& betav =
+            U_.db().lookupObject<volScalarField>("betav");
+
+        const volSymmTensorField& CT =
+            U_.db().lookupObject<volSymmTensorField>("CT");
+
+        Gk =
+            (0.5*rho_)*mag(U_)*(U_ & CT & U_)
+          + Csk*betav*turbulence_.muEff()*sqr(Aw_)*magSqr(U_);
+    }
+
+    return tGk;
+}
+
+
+bool Foam::PDRDragModels::basic::read(const dictionary& PDRProperties)
+{
+    PDRDragModel::read(PDRProperties);
+
+    PDRDragModelCoeffs_.readEntry("Csu", Csu.value());
+    PDRDragModelCoeffs_.readEntry("Csk", Csk.value());
+
+    return true;
+}
+
+
+void Foam::PDRDragModels::basic::writeFields() const
+{
+    Aw_.write();
+    CR_.write();
+}
+
+// ************************************************************************* //

applications/solvers/combustion/PDRFoam/PDRModels/dragModels/basic/basic.H

+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | www.openfoam.com
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+    Copyright (C) 2011 OpenFOAM Foundation
+-------------------------------------------------------------------------------
+License
+    This file is part of OpenFOAM.
+
+    OpenFOAM is free software: you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
+
+Class
+    Foam::PDRDragModels::basic
+
+Description
+    Basic sub-grid obstacle drag model.
+    Details supplied by J Puttock 2/7/06.
+
+    <b> Sub-grid drag term </b>
+
+    The resistance term (force per unit of volume) is given by:
+
+    \f[
+        R = -\frac{1}{2} \rho \vert \dwea{\vec{U}} \vert \dwea{\vec{U}}.D
+    \f]
+
+    where:
+
+        \f$ D \f$ is the tensor field "CR" in \f$ m^{-1} \f$
+
+        This is term is treated implicitly in UEqn.H
+
+    <b> Sub-grid turbulence generation </b>
+
+    The turbulence source term \f$ G_{R} \f$ occurring in the
+    \f$ \kappa-\epsilon \f$ equations for the generation of turbulence due
+    to interaction with unresolved obstacles :
+
+    \f$ G_{R} = C_{s}\beta_{\nu}
+    \mu_{eff} A_{w}^{2}(\dwea{\vec{U}}-\dwea{\vec{U}_{s}})^2 + \frac{1}{2}
+    \rho \vert \dwea{\vec{U}} \vert \dwea{\vec{U}}.T.\dwea{\vec{U}} \f$
+
+    where:
+
+        \f$ C_{s} \f$ = 1
+
+        \f$ \beta_{\nu} \f$ is the volume porosity (file "betav").
+
+        \f$ \mu_{eff} \f$ is the effective viscosity.
+
+        \f$ A_{w}^{2}\f$ is the obstacle surface area per unit of volume
+        (file "Aw").
+
+        \f$ \dwea{\vec{U}_{s}} \f$ is the slip velocity and is considered
+        \f$ \frac{1}{2}. \dwea{\vec{U}} \f$.
+
+        \f$ T \f$ is a tensor in the file CT.
+
+    The term \f$ G_{R} \f$ is treated explicitly in the \f$ \kappa-\epsilon
+    \f$ Eqs in the \link PDRkEpsilon.C \endlink file.
+
+
+SourceFiles
+    basic.C
+
+\*---------------------------------------------------------------------------*/
+
+#ifndef basic_H
+#define basic_H
+
+#include "PDRDragModel.H"
+#include "XiEqModel.H"
+
+
+namespace Foam
+{
+namespace PDRDragModels
+{
+
+/*---------------------------------------------------------------------------*\
+                          Class basic Declaration
+\*---------------------------------------------------------------------------*/
+
+class basic
+:
+    public PDRDragModel
+{
+    // Private data
+
+        dimensionedScalar Csu;
+        dimensionedScalar Csk;
+
+        volScalarField Aw_;
+        volSymmTensorField CR_;
+
+
+    // Private Member Functions
+
+        //- No copy construct
+        basic(const basic&) = delete;
+
+        //- No copy assignment
+        void operator=(const basic&) = delete;
+
+
+public:
+
+    //- Runtime type information
+    TypeName("basic");
+
+
+    // Constructors
+
+        //- Construct from components
+        basic
+        (
+            const dictionary& PDRProperties,
+            const compressible::RASModel& turbulence,
+            const volScalarField& rho,
+            const volVectorField& U,
+            const surfaceScalarField& phi
+        );
+
+
+    //- Destructor
+    virtual ~basic();
+
+
+    // Member Functions
+
+        //- Return the momentum drag coefficient
+        virtual tmp<volSymmTensorField> Dcu() const;
+
+        //- Return the momentum drag turbulence generation rate
+        virtual tmp<volScalarField> Gk() const;
+
+        //- Update properties from given dictionary
+        virtual bool read(const dictionary& PDRProperties);
+
+        //- Write fields
+        void writeFields() const;
+};
+
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+} // End namespace PDRDragModels
+} // End namespace Foam
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+#endif
+
+// ************************************************************************* //

applications/solvers/combustion/PDRFoam/PDRModels/turbulence/PDRkEpsilon/PDRkEpsilon.C

+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | www.openfoam.com
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+    Copyright (C) 2011-2016 OpenFOAM Foundation
+    Copyright (C) 2019-2020 OpenCFD Ltd.
+-------------------------------------------------------------------------------
+License
+    This file is part of OpenFOAM.
+
+    OpenFOAM is free software: you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
+
+\*---------------------------------------------------------------------------*/
+
+#include "PDRkEpsilon.H"
+#include "PDRDragModel.H"
+#include "addToRunTimeSelectionTable.H"
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+namespace Foam
+{
+namespace compressible
+{
+namespace RASModels
+{
+
+// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
+
+defineTypeNameAndDebug(PDRkEpsilon, 0);
+addToRunTimeSelectionTable(RASModel, PDRkEpsilon, dictionary);
+
+// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
+
+PDRkEpsilon::PDRkEpsilon
+(
+    const geometricOneField& alpha,
+    const volScalarField& rho,
+    const volVectorField& U,
+    const surfaceScalarField& alphaRhoPhi,
+    const surfaceScalarField& phi,
+    const fluidThermo& thermophysicalModel,
+    const word& turbulenceModelName,
+    const word& modelName
+)
+:
+    Foam::RASModels::kEpsilon<EddyDiffusivity<compressible::turbulenceModel>>
+    (
+        geometricOneField(),
+        rho,
+        U,
+        phi,
+        phi,
+        thermophysicalModel,
+        turbulenceModelName,
+        modelName
+    ),
+
+    C4_
+    (
+        dimensioned<scalar>::getOrAddToDict
+        (
+            "C4",
+            coeffDict_,
+            0.1
+        )
+    )
+{}
+
+
+// * * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * //
+
+PDRkEpsilon::~PDRkEpsilon()
+{}
+
+
+// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
+
+bool PDRkEpsilon::read()
+{
+    if (RASModel::read())
+    {
+        C4_.readIfPresent(coeffDict_);
+        return true;
+    }
+
+    return false;
+}
+
+
+void PDRkEpsilon::correct()
+{
+    if (!turbulence_)
+    {
+        // Re-calculate viscosity
+        nut_ = Cmu_*sqr(k_)/epsilon_;
+        nut_.correctBoundaryConditions();
+
+        // Re-calculate thermal diffusivity
+        //***HGWalphat_ = mut_/Prt_;
+        //alphat_.correctBoundaryConditions();
+
+        return;
+    }
+
+    RASModel::correct();
+
+    volScalarField divU(fvc::div(phi_/fvc::interpolate(rho_)));
+
+    if (mesh_.moving())
+    {
+        divU += fvc::div(mesh_.phi());
+    }
+
+    tmp<volTensorField> tgradU = fvc::grad(U_);
+    volScalarField G(GName(), rho_*nut_*(tgradU() && dev(twoSymm(tgradU()))));
+    tgradU.clear();
+
+    // Update epsilon and G at the wall
+    epsilon_.boundaryFieldRef().updateCoeffs();
+
+    // Add the blockage generation term so that it is included consistently
+    // in both the k and epsilon equations
+    const volScalarField& betav =
+        U_.db().lookupObject<volScalarField>("betav");
+
+    const volScalarField& Lobs =
+        U_.db().lookupObject<volScalarField>("Lobs");
+
+    const PDRDragModel& drag =
+        U_.db().lookupObject<PDRDragModel>("PDRDragModel");
+
+    volScalarField GR(drag.Gk());
+
+    volScalarField LI
+        (C4_*(Lobs + dimensionedScalar("minLength", dimLength, VSMALL)));
+
+    // Dissipation equation
+    tmp<fvScalarMatrix> epsEqn
+    (
+        betav*fvm::ddt(rho_, epsilon_)
+      + fvm::div(phi_, epsilon_)
+      - fvm::laplacian(rho_*DepsilonEff(), epsilon_)
+     ==
+        C1_*betav*G*epsilon_/k_
+      + 1.5*pow(Cmu_, 3.0/4.0)*GR*sqrt(k_)/LI
+      - fvm::SuSp(((2.0/3.0)*C1_)*betav*rho_*divU, epsilon_)
+      - fvm::Sp(C2_*betav*rho_*epsilon_/k_, epsilon_)
+    );
+
+    epsEqn.ref().relax();
+
+    epsEqn.ref().boundaryManipulate(epsilon_.boundaryFieldRef());
+
+    solve(epsEqn);
+    bound(epsilon_, epsilonMin_);
+
+
+    // Turbulent kinetic energy equation
+
+    tmp<fvScalarMatrix> kEqn
+    (
+        betav*fvm::ddt(rho_, k_)
+      + fvm::div(phi_, k_)
+      - fvm::laplacian(rho_*DkEff(), k_)
+     ==
+        betav*G + GR
+      - fvm::SuSp((2.0/3.0)*betav*rho_*divU, k_)
+      - fvm::Sp(betav*rho_*epsilon_/k_, k_)
+    );
+
+    kEqn.ref().relax();
+    solve(kEqn);
+    bound(k_, kMin_);
+
+    // Re-calculate viscosity
+    nut_ = Cmu_*sqr(k_)/epsilon_;
+    nut_.correctBoundaryConditions();
+
+    // Re-calculate thermal diffusivity
+    //***HGWalphat_ = mut_/Prt_;
+    //alphat_.correctBoundaryConditions();
+}
+
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+} // End namespace RASModels
+} // End namespace compressible
+} // End namespace Foam
+
+// ************************************************************************* //

applications/solvers/combustion/PDRFoam/PDRModels/turbulence/PDRkEpsilon/PDRkEpsilon.H

+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | www.openfoam.com
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+    Copyright (C) 2011-2015 OpenFOAM Foundation
+-------------------------------------------------------------------------------
+License
+    This file is part of OpenFOAM.
+
+    OpenFOAM is free software: you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
+
+Class
+    Foam::compressible::RASModels::PDRkEpsilon
+
+Description
+    Standard k-epsilon turbulence model with additional source terms
+    corresponding to PDR basic drag model (\link basic.H \endlink)
+
+    The default model coefficients correspond to the following:
+    \verbatim
+        PDRkEpsilonCoeffs
+        {
+            Cmu         0.09;
+            C1          1.44;
+            C2          1.92;
+            C3          -0.33;  // only for compressible
+            C4          0.1;
+            sigmak      1.0;    // only for compressible
+            sigmaEps    1.3;
+            Prt         1.0;    // only for compressible
+        }
+    \endverbatim
+
+    The turbulence source term \f$ G_{R} \f$ appears in the
+    \f$ \kappa-\epsilon \f$ equation for the generation of turbulence due to
+    interaction with unresolved obstacles.
+
+    In the \f$ \epsilon  \f$ equation \f$ C_{1} G_{R} \f$ is added as a source
+    term.
+
+    In the \f$ \kappa \f$ equation \f$ G_{R} \f$ is added as a source term.
+
+SourceFiles
+    PDRkEpsilon.C
+
+\*---------------------------------------------------------------------------*/
+
+#ifndef compressiblePDRkEpsilon_H
+#define compressiblePDRkEpsilon_H
+
+#include "kEpsilon.H"
+#include "turbulentFluidThermoModel.H"
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+namespace Foam
+{
+namespace compressible
+{
+namespace RASModels
+{
+
+/*---------------------------------------------------------------------------*\
+                           Class PDRkEpsilon Declaration
+\*---------------------------------------------------------------------------*/
+
+class PDRkEpsilon
+:
+    public Foam::RASModels::kEpsilon
+    <
+        EddyDiffusivity
+        <
+            compressible::turbulenceModel
+        >
+    >
+{
+    // Private data
+
+        // Model coefficients
+        dimensionedScalar C4_;
+
+
+public:
+
+    //- Runtime type information
+    TypeName("PDRkEpsilon");
+
+
+    // Constructors
+
+        //- Construct from components
+        PDRkEpsilon
+        (
+            const geometricOneField& alpha,
+            const volScalarField& rho,
+            const volVectorField& U,
+            const surfaceScalarField& alphaRhoPhi,
+            const surfaceScalarField& phi,
+            const fluidThermo& thermophysicalModel,
+            const word& turbulenceModelName = turbulenceModel::typeName,
+            const word& modelName = typeName
+        );
+
+
+    //- Destructor
+    virtual ~PDRkEpsilon();
+
+
+    // Member Functions
+
+        //- Solve the turbulence equations and correct the turbulence viscosity
+        void correct();
+
+        //- Read turbulenceProperties dictionary
+        bool read();
+};
+
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+} // End namespace RASModels
+} // End namespace compressible
+} // End namespace Foam
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+#endif
+
+// ************************************************************************* //

applications/solvers/combustion/PDRFoam/StCourantNo.H

+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | www.openfoam.com
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+    Copyright (C) 2011-2016 OpenFOAM Foundation
+-------------------------------------------------------------------------------
+License
+    This file is part of OpenFOAM.
+
+    OpenFOAM is free software: you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
+
+Global
+    CourantNo
+
+Description
+    Calculates and outputs the mean and maximum Courant Numbers.
+
+\*---------------------------------------------------------------------------*/
+
+{
+    scalar meanStCoNum = 0.0;
+
+    if (mesh.nInternalFaces())
+    {
+       scalarField sumPhi
+        (
+            fvc::surfaceSum(mag(phiSt))().primitiveField()
+          / rho.primitiveField()
+        );
+
+        StCoNum = 0.5*gMax(sumPhi/mesh.V().field())*runTime.deltaTValue();
+
+        meanStCoNum =
+            0.5*(gSum(sumPhi)/gSum(mesh.V().field()))*runTime.deltaTValue();
+    }
+
+    Info<< "St courant Number mean: " << meanStCoNum
+        << " max: " << StCoNum << endl;
+}
+
+// ************************************************************************* //

applications/solvers/combustion/PDRFoam/UEqn.H

+    MRF.correctBoundaryVelocity(U);
+
+    fvVectorMatrix UEqn
+    (
+        betav*fvm::ddt(rho, U) + fvm::div(phi, U)
+      + MRF.DDt(rho, U)
+      + turbulence->divDevRhoReff(U)
+     ==
+        betav*rho*g
+      + betav*fvOptions(rho, U)
+    );
+
+    fvOptions.constrain(UEqn);
+
+    volSymmTensorField invA(inv(I*UEqn.A() + drag->Dcu()));
+
+    if (pimple.momentumPredictor())
+    {
+        U = invA & (UEqn.H() - betav*fvc::grad(p));
+        U.correctBoundaryConditions();
+        fvOptions.correct(U);
+        K = 0.5*magSqr(U);
+    }

applications/solvers/combustion/PDRFoam/XiModels/XiEqModels/Gulder/Gulder.C

+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | www.openfoam.com
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+    Copyright (C) 2011-2016 OpenFOAM Foundation
+-------------------------------------------------------------------------------
+License
+    This file is part of OpenFOAM.
+
+    OpenFOAM is free software: you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
+
+\*---------------------------------------------------------------------------*/
+
+#include "Gulder.H"
+#include "addToRunTimeSelectionTable.H"
+
+// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
+
+namespace Foam
+{
+namespace XiEqModels
+{
+    defineTypeNameAndDebug(Gulder, 0);
+    addToRunTimeSelectionTable(XiEqModel, Gulder, dictionary);
+}
+}
+
+
+// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
+
+Foam::XiEqModels::Gulder::Gulder
+(
+    const dictionary& XiEqProperties,
+    const psiuReactionThermo& thermo,
+    const compressible::RASModel& turbulence,
+    const volScalarField& Su
+)
+:
+    XiEqModel(XiEqProperties, thermo, turbulence, Su),
+    XiEqCoef_(XiEqModelCoeffs_.get<scalar>("XiEqCoef")),
+    SuMin_(0.01*Su.average()),
+    uPrimeCoef_(XiEqModelCoeffs_.get<scalar>("uPrimeCoef")),
+    subGridSchelkin_(XiEqModelCoeffs_.get<bool>("subGridSchelkin"))
+{}
+
+
+// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
+
+Foam::XiEqModels::Gulder::~Gulder()
+{}
+
+
+// * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * * //
+
+Foam::tmp<Foam::volScalarField> Foam::XiEqModels::Gulder::XiEq() const
+{
+    volScalarField up(sqrt((2.0/3.0)*turbulence_.k()));
+    const volScalarField& epsilon = turbulence_.epsilon();
+
+    if (subGridSchelkin_)
+    {
+        up.primitiveFieldRef() += calculateSchelkinEffect(uPrimeCoef_);
+    }
+
+    volScalarField tauEta(sqrt(mag(thermo_.muu()/(thermo_.rhou()*epsilon))));
+
+    volScalarField Reta
+    (
+        up
+      / (
+            sqrt(epsilon*tauEta)
+          + dimensionedScalar("1e-8", up.dimensions(), 1e-8)
+        )
+    );
+
+    return (1.0 + XiEqCoef_*sqrt(up/(Su_ + SuMin_))*Reta);
+}
+
+
+bool Foam::XiEqModels::Gulder::read(const dictionary& XiEqProperties)
+{
+    XiEqModel::read(XiEqProperties);
+
+    XiEqModelCoeffs_.readEntry("XiEqCoef", XiEqCoef_);
+    XiEqModelCoeffs_.readEntry("uPrimeCoef", uPrimeCoef_);
+    XiEqModelCoeffs_.readEntry("subGridSchelkin", subGridSchelkin_);
+
+    return true;
+}
+
+
+// ************************************************************************* //

applications/solvers/combustion/PDRFoam/XiModels/XiEqModels/Gulder/Gulder.H

+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | www.openfoam.com
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+    Copyright (C) 2011-2012 OpenFOAM Foundation
+-------------------------------------------------------------------------------
+License
+    This file is part of OpenFOAM.
+
+    OpenFOAM is free software: you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
+
+Class
+    Foam::XiEqModels::Gulder
+
+Description
+    Simple Gulder model for XiEq based on Gulders correlation
+    with a linear correction function to give a plausible profile for XiEq.
+
+SourceFiles
+    Gulder.C
+
+\*---------------------------------------------------------------------------*/
+
+#ifndef Gulder_H
+#define Gulder_H
+
+#include "XiEqModel.H"
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+namespace Foam
+{
+namespace XiEqModels
+{
+
+/*---------------------------------------------------------------------------*\
+                          Class Gulder Declaration
+\*---------------------------------------------------------------------------*/
+
+class Gulder
+:
+    public XiEqModel
+{
+    // Private data
+
+        //- Model constant
+        scalar XiEqCoef_;
+
+        //- Minimum laminar burning velocity
+        const dimensionedScalar SuMin_;
+
+        //- Schelkin effect Model constant
+        scalar uPrimeCoef_;
+
+        //- Use sub-grid Schelkin effect
+        bool subGridSchelkin_;
+
+
+    // Private Member Functions
+
+        //- No copy construct
+        Gulder(const Gulder&) = delete;
+
+        //- No copy assignment
+        void operator=(const Gulder&) = delete;
+
+
+public:
+
+    //- Runtime type information
+    TypeName("Gulder");
+
+
+    // Constructors
+
+        //- Construct from components
+        Gulder
+        (
+            const dictionary& XiEqProperties,
+            const psiuReactionThermo& thermo,
+            const compressible::RASModel& turbulence,
+            const volScalarField& Su
+        );
+
+
+    //- Destructor
+    virtual ~Gulder();
+
+
+    // Member Functions
+
+        //- Return the flame-wrinkling XiEq
+        virtual tmp<volScalarField> XiEq() const;
+
+        //- Update properties from given dictionary
+        virtual bool read(const dictionary& XiEqProperties);
+
+};
+
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+} // End namespace XiEqModels
+} // End namespace Foam
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+#endif
+
+// ************************************************************************* //

applications/solvers/combustion/PDRFoam/XiModels/XiEqModels/SCOPEBlendXiEq/SCOPEBlendXiEq.C

+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | www.openfoam.com
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+    Copyright (C) 2011-2015 OpenFOAM Foundation
+-------------------------------------------------------------------------------
+License
+    This file is part of OpenFOAM.
+
+    OpenFOAM is free software: you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
+
+\*---------------------------------------------------------------------------*/
+
+#include "SCOPEBlendXiEq.H"
+#include "addToRunTimeSelectionTable.H"
+
+// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
+
+namespace Foam
+{
+namespace XiEqModels
+{
+    defineTypeNameAndDebug(SCOPEBlend, 0);
+    addToRunTimeSelectionTable(XiEqModel, SCOPEBlend, dictionary);
+}
+}
+
+
+// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
+
+Foam::XiEqModels::SCOPEBlend::SCOPEBlend
+(
+    const dictionary& XiEqProperties,
+    const psiuReactionThermo& thermo,
+    const compressible::RASModel& turbulence,
+    const volScalarField& Su
+)
+:
+    XiEqModel(XiEqProperties, thermo, turbulence, Su),
+    XiEqModelL_
+    (
+        XiEqModel::New
+        (
+            XiEqModelCoeffs_.subDict("XiEqModelL"),
+            thermo,
+            turbulence,
+            Su
+        )
+    ),
+    XiEqModelH_
+    (
+        XiEqModel::New
+        (
+            XiEqModelCoeffs_.subDict("XiEqModelH"),
+            thermo,
+            turbulence,
+            Su
+        )
+    )
+{}
+
+
+// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
+
+Foam::XiEqModels::SCOPEBlend::~SCOPEBlend()
+{}
+
+
+// * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * * //
+
+Foam::tmp<Foam::volScalarField> Foam::XiEqModels::SCOPEBlend::XiEq() const
+{
+    return pow
+    (
+        pow4(1.0/XiEqModelL_->XiEq()) + pow4(1.0/XiEqModelH_->XiEq()),
+        -0.25
+    );
+}
+
+
+// ************************************************************************* //

applications/solvers/combustion/PDRFoam/XiModels/XiEqModels/SCOPEBlendXiEq/SCOPEBlendXiEq.H

+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | www.openfoam.com
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+    Copyright (C) 2011-2012 OpenFOAM Foundation
+-------------------------------------------------------------------------------
+License
+    This file is part of OpenFOAM.
+
+    OpenFOAM is free software: you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
+
+Class
+    Foam::XiEqModels::SCOPEBlend
+
+Description
+    Simple SCOPEBlendXiEq model for XiEq based on SCOPEXiEqs correlation
+    with a linear correction function to give a plausible profile for XiEq.
+    See \link SCOPELaminarFlameSpeed.H \endlink for details on the SCOPE
+    laminar flame speed model.
+
+SourceFiles
+    SCOPEBlend.C
+
+\*---------------------------------------------------------------------------*/
+
+#ifndef SCOPEBlend_H
+#define SCOPEBlend_H
+
+#include "XiEqModel.H"
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+namespace Foam
+{
+namespace XiEqModels
+{
+
+/*---------------------------------------------------------------------------*\
+                          Class SCOPEBlend Declaration
+\*---------------------------------------------------------------------------*/
+
+class SCOPEBlend
+:
+    public XiEqModel
+{
+    // Private data
+
+        //- Low turbulence intensity equilibrium Xi model
+        autoPtr<XiEqModel> XiEqModelL_;
+
+        //- High turbulence intensity equilibrium Xi model
+        autoPtr<XiEqModel> XiEqModelH_;
+
+
+    // Private Member Functions
+
+        //- No copy construct
+        SCOPEBlend(const SCOPEBlend&) = delete;
+
+        //- No copy assignment
+        void operator=(const SCOPEBlend&) = delete;
+
+
+public:
+
+    //- Runtime type information
+    TypeName("SCOPEBlend");
+
+
+    // Constructors
+
+        //- Construct from components
+        SCOPEBlend
+        (
+            const dictionary& XiEqProperties,
+            const psiuReactionThermo& thermo,
+            const compressible::RASModel& turbulence,
+            const volScalarField& Su
+        );
+
+
+    //- Destructor
+    virtual ~SCOPEBlend();
+
+
+    // Member Functions
+
+        //- Return the flame-wrinkling XiEq
+        virtual tmp<volScalarField> XiEq() const;
+
+        //- Update properties from given dictionary
+        virtual bool read(const dictionary& XiEqProperties)
+        {
+            return true;
+        }
+
+};
+
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+} // End namespace XiEqModels
+} // End namespace Foam
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+#endif
+
+// ************************************************************************* //

applications/solvers/combustion/PDRFoam/XiModels/XiEqModels/SCOPEXiEq/SCOPEXiEq.C

+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | www.openfoam.com
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+    Copyright (C) 2011-2016 OpenFOAM Foundation
+-------------------------------------------------------------------------------
+License
+    This file is part of OpenFOAM.
+
+    OpenFOAM is free software: you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
+
+\*---------------------------------------------------------------------------*/
+
+#include "SCOPEXiEq.H"
+#include "addToRunTimeSelectionTable.H"
+
+// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
+
+namespace Foam
+{
+namespace XiEqModels
+{
+    defineTypeNameAndDebug(SCOPEXiEq, 0);
+    addToRunTimeSelectionTable(XiEqModel, SCOPEXiEq, dictionary);
+}
+}
+
+
+// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
+
+Foam::XiEqModels::SCOPEXiEq::SCOPEXiEq
+(
+    const dictionary& XiEqProperties,
+    const psiuReactionThermo& thermo,
+    const compressible::RASModel& turbulence,
+    const volScalarField& Su
+)
+:
+    XiEqModel(XiEqProperties, thermo, turbulence, Su),
+    XiEqCoef_(XiEqModelCoeffs_.get<scalar>("XiEqCoef")),
+    XiEqExp_(XiEqModelCoeffs_.get<scalar>("XiEqExp")),
+    lCoef_(XiEqModelCoeffs_.get<scalar>("lCoef")),
+    SuMin_(0.01*Su.average()),
+    uPrimeCoef_(XiEqModelCoeffs_.get<scalar>("uPrimeCoef")),
+    subGridSchelkin_(XiEqModelCoeffs_.get<bool>("subGridSchelkin")),
+    MaModel
+    (
+        Su.mesh().lookupObject<IOdictionary>("combustionProperties"),
+        thermo
+    )
+{}
+
+
+// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
+
+Foam::XiEqModels::SCOPEXiEq::~SCOPEXiEq()
+{}
+
+
+// * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * * //
+
+Foam::tmp<Foam::volScalarField> Foam::XiEqModels::SCOPEXiEq::XiEq() const
+{
+    const volScalarField& k = turbulence_.k();
+    const volScalarField& epsilon = turbulence_.epsilon();
+
+    volScalarField up(sqrt((2.0/3.0)*k));
+    if (subGridSchelkin_)
+    {
+        up.primitiveFieldRef() += calculateSchelkinEffect(uPrimeCoef_);
+    }
+
+    volScalarField l(lCoef_*sqrt(3.0/2.0)*up*k/epsilon);
+    volScalarField Rl(up*l*thermo_.rhou()/thermo_.muu());
+
+    volScalarField upBySu(up/(Su_ + SuMin_));
+    volScalarField K(0.157*upBySu/sqrt(Rl));
+    volScalarField Ma(MaModel.Ma());
+
+    tmp<volScalarField> tXiEq
+    (
+        new volScalarField
+        (
+            IOobject
+            (
+                "XiEq",
+                epsilon.time().timeName(),
+                epsilon.db(),
+                IOobject::NO_READ,
+                IOobject::NO_WRITE
+            ),
+            epsilon.mesh(),
+            dimensionedScalar(dimless, Zero)
+        )
+    );
+    volScalarField& xieq = tXiEq.ref();
+
+    forAll(xieq, celli)
+    {
+        if (Ma[celli] > 0.01)
+        {
+            xieq[celli] =
+                XiEqCoef_*pow(K[celli]*Ma[celli], -XiEqExp_)*upBySu[celli];
+        }
+    }
+
+    volScalarField::Boundary& xieqBf = xieq.boundaryFieldRef();
+
+    forAll(xieq.boundaryField(), patchi)
+    {
+        scalarField& xieqp = xieqBf[patchi];
+        const scalarField& Kp = K.boundaryField()[patchi];
+        const scalarField& Map = Ma.boundaryField()[patchi];
+        const scalarField& upBySup = upBySu.boundaryField()[patchi];
+
+        forAll(xieqp, facei)
+        {
+            if (Ma[facei] > 0.01)
+            {
+                xieqp[facei] =
+                    XiEqCoef_*pow(Kp[facei]*Map[facei], -XiEqExp_)
+                   *upBySup[facei];
+            }
+        }
+    }
+
+    return tXiEq;
+}
+
+
+bool Foam::XiEqModels::SCOPEXiEq::read(const dictionary& XiEqProperties)
+{
+    XiEqModel::read(XiEqProperties);
+
+    XiEqModelCoeffs_.readEntry("XiEqCoef", XiEqCoef_);
+    XiEqModelCoeffs_.readEntry("XiEqExp", XiEqExp_);
+    XiEqModelCoeffs_.readEntry("lCoef", lCoef_);
+    XiEqModelCoeffs_.readEntry("uPrimeCoef", uPrimeCoef_);
+    XiEqModelCoeffs_.readEntry("subGridSchelkin", subGridSchelkin_);
+
+    return true;
+}
+
+
+// ************************************************************************* //

applications/solvers/combustion/PDRFoam/XiModels/XiEqModels/SCOPEXiEq/SCOPEXiEq.H

+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | www.openfoam.com
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+    Copyright (C) 2011-2013 OpenFOAM Foundation
+-------------------------------------------------------------------------------
+License
+    This file is part of OpenFOAM.
+
+    OpenFOAM is free software: you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
+
+Class
+    Foam::XiEqModels::SCOPEXiEq
+
+Description
+    Simple SCOPEXiEq model for XiEq based on SCOPEXiEqs correlation
+    with a linear correction function to give a plausible profile for XiEq.
+    See \link SCOPELaminarFlameSpeed.H \endlink for details on the SCOPE laminar
+    flame speed model.
+
+SourceFiles
+    SCOPEXiEq.C
+
+\*---------------------------------------------------------------------------*/
+
+#ifndef SCOPEXiEq_H
+#define SCOPEXiEq_H
+
+#include "XiEqModel.H"
+#include "SCOPELaminarFlameSpeed.H"
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+namespace Foam
+{
+namespace XiEqModels
+{
+
+/*---------------------------------------------------------------------------*\
+                          Class SCOPEXiEq Declaration
+\*---------------------------------------------------------------------------*/
+
+class SCOPEXiEq
+:
+    public XiEqModel
+{
+    // Private data
+
+        // Model constant
+        scalar XiEqCoef_;
+
+        // Model constant
+        scalar XiEqExp_;
+
+        // Model constant
+        scalar lCoef_;
+
+        //- Minimum Su
+        dimensionedScalar SuMin_;
+
+        //- Schelkin effect Model constant
+        scalar uPrimeCoef_;
+
+        //- Use sub-grid Schelkin effect
+        bool subGridSchelkin_;
+
+        //- The SCOPE laminar flame speed model used to obtain the
+        //  Marstein number.  Note: the laminar flame speed need not be
+        //  obtained form the same model.
+        laminarFlameSpeedModels::SCOPE MaModel;
+
+
+    // Private Member Functions
+
+        //- No copy construct
+        SCOPEXiEq(const SCOPEXiEq&) = delete;
+
+        //- No copy assignment
+        void operator=(const SCOPEXiEq&) = delete;
+
+
+public:
+
+    //- Runtime type information
+    TypeName("SCOPEXiEq");
+
+
+    // Constructors
+
+        //- Construct from components
+        SCOPEXiEq
+        (
+            const dictionary& XiEqProperties,
+            const psiuReactionThermo& thermo,
+            const compressible::RASModel& turbulence,
+            const volScalarField& Su
+        );
+
+
+    //- Destructor
+    virtual ~SCOPEXiEq();
+
+
+    // Member Functions
+
+        //- Return the flame-wrinkling XiEq
+        virtual tmp<volScalarField> XiEq() const;
+
+        //- Update properties from given dictionary
+        virtual bool read(const dictionary& XiEqProperties);
+};
+
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+} // End namespace XiEqModels
+} // End namespace Foam
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+#endif
+
+// ************************************************************************* //

applications/solvers/combustion/PDRFoam/XiModels/XiEqModels/XiEqModel/XiEqModel.C

+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | www.openfoam.com
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+    Copyright (C) 2011-2017 OpenFOAM Foundation
+-------------------------------------------------------------------------------
+License
+    This file is part of OpenFOAM.
+
+    OpenFOAM is free software: you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
+
+\*---------------------------------------------------------------------------*/
+
+#include "XiEqModel.H"
+
+// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
+
+namespace Foam
+{
+    defineTypeNameAndDebug(XiEqModel, 0);
+    defineRunTimeSelectionTable(XiEqModel, dictionary);
+}
+
+
+// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
+
+Foam::XiEqModel::XiEqModel
+(
+    const dictionary& XiEqProperties,
+    const psiuReactionThermo& thermo,
+    const compressible::RASModel& turbulence,
+    const volScalarField& Su
+)
+:
+    XiEqModelCoeffs_
+    (
+        XiEqProperties.subDict
+        (
+            XiEqProperties.get<word>("XiEqModel") + "Coeffs"
+        )
+    ),
+    thermo_(thermo),
+    turbulence_(turbulence),
+    Su_(Su)
+{}
+
+
+// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
+
+Foam::XiEqModel::~XiEqModel()
+{}
+
+
+// * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * * //
+
+bool Foam::XiEqModel::read(const dictionary& XiEqProperties)
+{
+    XiEqModelCoeffs_ = XiEqProperties.optionalSubDict(type() + "Coeffs");
+
+    return true;
+}
+
+
+void Foam::XiEqModel::writeFields() const
+{
+    //***HGW It is not clear why B is written here
+    if (Su_.mesh().foundObject<volSymmTensorField>("B"))
+    {
+        const volSymmTensorField& B =
+            Su_.mesh().lookupObject<volSymmTensorField>("B");
+        B.write();
+    }
+}
+
+
+Foam::tmp<Foam::volScalarField>
+Foam::XiEqModel::calculateSchelkinEffect(const scalar uPrimeCoef) const
+{
+    const fvMesh& mesh = Su_.mesh();
+
+    const volVectorField& U = mesh.lookupObject<volVectorField>("U");
+    const volSymmTensorField& CT = mesh.lookupObject<volSymmTensorField>("CT");
+    const volScalarField& Nv = mesh.lookupObject<volScalarField>("Nv");
+    const volSymmTensorField& nsv =
+        mesh.lookupObject<volSymmTensorField>("nsv");
+
+    tmp<volScalarField> tN
+    (
+        new volScalarField
+        (
+            IOobject
+            (
+                "tN",
+                mesh.time().timeName(),
+                mesh,
+                IOobject::NO_READ,
+                IOobject::NO_WRITE,
+                false
+            ),
+            mesh,
+            dimensionedScalar(Nv.dimensions(), Zero)
+        )
+    );
+    volScalarField& N = tN.ref();
+    N.primitiveFieldRef() = Nv.primitiveField()*pow(mesh.V(), 2.0/3.0);
+
+    volSymmTensorField ns
+    (
+        IOobject
+        (
+            "tns",
+            mesh.time().timeName(),
+            mesh,
+            IOobject::NO_READ,
+            IOobject::NO_WRITE
+        ),
+        mesh,
+        dimensionedSymmTensor(nsv.dimensions(), Zero)
+    );
+    ns.primitiveFieldRef() = nsv.primitiveField()*pow(mesh.V(), 2.0/3.0);
+
+    const volVectorField Uhat
+    (
+        U/(mag(U) + dimensionedScalar("Usmall", U.dimensions(), 1e-4))
+    );
+
+    const volScalarField nr(sqrt(max(N - (Uhat & ns & Uhat), scalar(1e-4))));
+
+    const scalarField cellWidth(pow(mesh.V(), 1.0/3.0));
+
+    const scalarField upLocal(uPrimeCoef*sqrt((U & CT & U)*cellWidth));
+
+    const scalarField deltaUp(upLocal*(max(scalar(1), pow(nr, 0.5)) - 1.0));
+
+    // Re use tN
+    N.primitiveFieldRef() = upLocal*(max(scalar(1), pow(nr, 0.5)) - 1.0);
+
+    return tN;
+}
+
+
+// ************************************************************************* //

applications/solvers/combustion/PDRFoam/XiModels/XiEqModels/XiEqModel/XiEqModel.H

+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | www.openfoam.com
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+    Copyright (C) 2011-2015 OpenFOAM Foundation
+-------------------------------------------------------------------------------
+License
+    This file is part of OpenFOAM.
+
+    OpenFOAM is free software: you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
+
+Class
+    Foam::XiEqModel
+
+Description
+    Base-class for all XiEq models used by the b-XiEq combustion model.
+    The available models are :
+        \link basicXiSubXiEq.H \endlink
+        \link Gulder.H \endlink
+        \link instabilityXiEq.H \endlink
+        \link SCOPEBlendXiEq.H \endlink
+        \link SCOPEXiEq.H \endlink
+
+SourceFiles
+    XiEqModel.C
+
+\*---------------------------------------------------------------------------*/
+
+#ifndef XiEqModel_H
+#define XiEqModel_H
+
+#include "IOdictionary.H"
+#include "psiuReactionThermo.H"
+#include "turbulentFluidThermoModel.H"
+#include "runTimeSelectionTables.H"
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+namespace Foam
+{
+
+/*---------------------------------------------------------------------------*\
+                          Class XiEqModel Declaration
+\*---------------------------------------------------------------------------*/
+
+class XiEqModel
+{
+
+protected:
+
+    // Protected data
+
+        //- Dictionary
+        dictionary XiEqModelCoeffs_;
+
+        //- Thermo
+        const psiuReactionThermo& thermo_;
+
+        //- Turbulence
+        const compressible::RASModel& turbulence_;
+
+        //- Laminar burning velocity
+        const volScalarField& Su_;
+
+
+private:
+
+    // Private Member Functions
+
+        //- No copy construct
+        XiEqModel(const XiEqModel&) = delete;
+
+        //- No copy assignment
+        void operator=(const XiEqModel&) = delete;
+
+
+public:
+
+    //- Runtime type information
+    TypeName("XiEqModel");
+
+
+    // Declare run-time constructor selection table
+
+        declareRunTimeSelectionTable
+        (
+            autoPtr,
+            XiEqModel,
+            dictionary,
+            (
+                const dictionary& XiEqProperties,
+                const psiuReactionThermo& thermo,
+                const compressible::RASModel& turbulence,
+                const volScalarField& Su
+            ),
+            (
+                XiEqProperties,
+                thermo,
+                turbulence,
+                Su
+            )
+        );
+
+
+    // Selectors
+
+        //- Return a reference to the selected XiEq model
+        static autoPtr<XiEqModel> New
+        (
+            const dictionary& XiEqProperties,
+            const psiuReactionThermo& thermo,
+            const compressible::RASModel& turbulence,
+            const volScalarField& Su
+        );
+
+
+    // Constructors
+
+        //- Construct from components
+        XiEqModel
+        (
+            const dictionary& XiEqProperties,
+            const psiuReactionThermo& thermo,
+            const compressible::RASModel& turbulence,
+            const volScalarField& Su
+        );
+
+
+    //- Destructor
+    virtual ~XiEqModel();
+
+
+    // Member Functions
+
+        //- Return the flame-wrinkling XiEq
+        virtual tmp<volScalarField> XiEq() const
+        {
+            return turbulence_.muEff();
+        }
+
+        //- Return the sub-grid Schelkin effect
+        tmp<volScalarField> calculateSchelkinEffect(const scalar) const;
+
+        //- Update properties from given dictionary
+        virtual bool read(const dictionary& XiEqProperties) = 0;
+
+        //- Write fields
+        void writeFields() const;
+};
+
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+} // End namespace Foam
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+#endif
+
+// ************************************************************************* //

applications/solvers/combustion/PDRFoam/XiModels/XiEqModels/XiEqModel/XiEqModelNew.C

+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | www.openfoam.com
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+    Copyright (C) 2011-2015 OpenFOAM Foundation
+    Copyright (C) 2019-2021 OpenCFD Ltd.
+-------------------------------------------------------------------------------
+License
+    This file is part of OpenFOAM.
+
+    OpenFOAM is free software: you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
+
+\*---------------------------------------------------------------------------*/
+
+#include "XiEqModel.H"
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+Foam::autoPtr<Foam::XiEqModel> Foam::XiEqModel::New
+(
+    const dictionary& dict,
+    const psiuReactionThermo& thermo,
+    const compressible::RASModel& turbulence,
+    const volScalarField& Su
+)
+{
+    const word modelType(dict.get<word>("XiEqModel"));
+
+    Info<< "Selecting flame-wrinkling model " << modelType << endl;
+
+    auto* ctorPtr = dictionaryConstructorTable(modelType);
+
+    if (!ctorPtr)
+    {
+        FatalIOErrorInLookup
+        (
+            dict,
+            "XiEqModel",
+            modelType,
+            *dictionaryConstructorTablePtr_
+        ) << exit(FatalIOError);
+    }
+
+    return autoPtr<XiEqModel>(ctorPtr(dict, thermo, turbulence, Su));
+}
+
+
+// ************************************************************************* //

applications/solvers/combustion/PDRFoam/XiModels/XiEqModels/instabilityXiEq/instabilityXiEq.C

+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | www.openfoam.com
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+    Copyright (C) 2011-2015 OpenFOAM Foundation
+-------------------------------------------------------------------------------
+License
+    This file is part of OpenFOAM.
+
+    OpenFOAM is free software: you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
+
+\*---------------------------------------------------------------------------*/
+
+#include "instabilityXiEq.H"
+#include "addToRunTimeSelectionTable.H"
+
+// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
+
+namespace Foam
+{
+namespace XiEqModels
+{
+    defineTypeNameAndDebug(instability, 0);
+    addToRunTimeSelectionTable(XiEqModel, instability, dictionary);
+}
+}
+
+
+// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
+
+Foam::XiEqModels::instability::instability
+(
+    const dictionary& XiEqProperties,
+    const psiuReactionThermo& thermo,
+    const compressible::RASModel& turbulence,
+    const volScalarField& Su
+)
+:
+    XiEqModel(XiEqProperties, thermo, turbulence, Su),
+    XiEqIn(XiEqModelCoeffs_.get<scalar>("XiEqIn")),
+    XiEqModel_(XiEqModel::New(XiEqModelCoeffs_, thermo, turbulence, Su))
+{}
+
+
+// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
+
+Foam::XiEqModels::instability::~instability()
+{}
+
+
+// * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * * //
+
+Foam::tmp<Foam::volScalarField> Foam::XiEqModels::instability::XiEq() const
+{
+    volScalarField turbXiEq(XiEqModel_->XiEq());
+    return XiEqIn/turbXiEq + turbXiEq;
+}
+
+
+bool Foam::XiEqModels::instability::read(const dictionary& XiEqProperties)
+{
+    XiEqModel::read(XiEqProperties);
+
+    XiEqModelCoeffs_.readEntry("XiEqIn", XiEqIn);
+
+    return XiEqModel_->read(XiEqModelCoeffs_);
+}
+
+
+// ************************************************************************* //

applications/solvers/combustion/PDRFoam/XiModels/XiEqModels/instabilityXiEq/instabilityXiEq.H

+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | www.openfoam.com
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+    Copyright (C) 2011-2012 OpenFOAM Foundation
+-------------------------------------------------------------------------------
+License
+    This file is part of OpenFOAM.
+
+    OpenFOAM is free software: you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
+
+Class
+    Foam::XiEqModels::instability
+
+Description
+    This is the equilibrium level of the flame wrinkling generated by
+    instability. It is a constant (default 2.5). It is used in
+    \link XiModel.H \endlink.
+
+SourceFiles
+    instability.C
+
+\*---------------------------------------------------------------------------*/
+
+#ifndef instability_H
+#define instability_H
+
+#include "XiEqModel.H"
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+namespace Foam
+{
+namespace XiEqModels
+{
+
+/*---------------------------------------------------------------------------*\
+                          Class instability Declaration
+\*---------------------------------------------------------------------------*/
+
+class instability
+:
+    public XiEqModel
+{
+    // Private data
+
+        //- Equilibrium Xi due to instability only
+        scalar XiEqIn;
+
+        //- Equilibrium Xi model due to all other effects
+        autoPtr<XiEqModel> XiEqModel_;
+
+
+    // Private Member Functions
+
+        //- No copy construct
+        instability(const instability&) = delete;
+
+        //- No copy assignment
+        void operator=(const instability&) = delete;
+
+
+public:
+
+    //- Runtime type information
+    TypeName("instability");
+
+
+    // Constructors
+
+        //- Construct from components
+        instability
+        (
+            const dictionary& XiEqProperties,
+            const psiuReactionThermo& thermo,
+            const compressible::RASModel& turbulence,
+            const volScalarField& Su
+        );
+
+
+    //- Destructor
+    virtual ~instability();
+
+
+    // Member Functions
+
+        //- Return the flame-wrinkling XiEq
+        virtual tmp<volScalarField> XiEq() const;
+
+        //- Update properties from given dictionary
+        virtual bool read(const dictionary& XiEqProperties);
+
+};
+
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+} // End namespace XiEqModels
+} // End namespace Foam
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+#endif
+
+// ************************************************************************* //

applications/solvers/combustion/PDRFoam/XiModels/XiGModels/KTS/KTS.C

+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | www.openfoam.com
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+    Copyright (C) 2011-2015 OpenFOAM Foundation
+-------------------------------------------------------------------------------
+License
+    This file is part of OpenFOAM.
+
+    OpenFOAM is free software: you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
+
+\*---------------------------------------------------------------------------*/
+
+#include "KTS.H"
+#include "addToRunTimeSelectionTable.H"
+
+// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
+
+namespace Foam
+{
+namespace XiGModels
+{
+    defineTypeNameAndDebug(KTS, 0);
+    addToRunTimeSelectionTable(XiGModel, KTS, dictionary);
+}
+}
+
+
+// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
+
+Foam::XiGModels::KTS::KTS
+(
+    const dictionary& XiGProperties,
+    const psiuReactionThermo& thermo,
+    const compressible::RASModel& turbulence,
+    const volScalarField& Su
+)
+:
+    XiGModel(XiGProperties, thermo, turbulence, Su),
+    GEtaCoef_(XiGModelCoeffs_.get<scalar>("GEtaCoef"))
+{}
+
+
+// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
+
+Foam::XiGModels::KTS::~KTS()
+{}
+
+
+// * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * * //
+
+Foam::tmp<Foam::volScalarField> Foam::XiGModels::KTS::G() const
+{
+    volScalarField up(sqrt((2.0/3.0)*turbulence_.k()));
+    const volScalarField& epsilon = turbulence_.epsilon();
+
+    volScalarField tauEta(sqrt(mag(thermo_.muu()/(thermo_.rhou()*epsilon))));
+
+    return (GEtaCoef_/tauEta);
+}
+
+
+bool Foam::XiGModels::KTS::read(const dictionary& XiGProperties)
+{
+    XiGModel::read(XiGProperties);
+
+    XiGModelCoeffs_.readEntry("GEtaCoef", GEtaCoef_);
+
+    return true;
+}
+
+
+// ************************************************************************* //