Added IshiiZuber drag model

applications/solvers/multiphase/twoPhaseEulerFoam/interfacialModels/dragModels/IshiiZuber/IshiiZuber.C

+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | Copyright (C) 2014 OpenFOAM Foundation
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+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 "IshiiZuber.H"
+#include "phasePair.H"
+#include "addToRunTimeSelectionTable.H"
+
+// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
+
+namespace Foam
+{
+namespace dragModels
+{
+    defineTypeNameAndDebug(IshiiZuber, 0);
+    addToRunTimeSelectionTable(dragModel, IshiiZuber, dictionary);
+}
+}
+
+
+// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
+
+Foam::dragModels::IshiiZuber::IshiiZuber
+(
+    const dictionary& dict,
+    const phasePair& pair,
+    const bool registerObject
+)
+:
+    dragModel(dict, pair, registerObject)
+{}
+
+
+// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
+
+Foam::dragModels::IshiiZuber::~IshiiZuber()
+{}
+
+
+// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
+
+Foam::tmp<Foam::volScalarField>
+Foam::dragModels::IshiiZuber::CdRe() const
+{
+    volScalarField Re(pair_.Re());
+    volScalarField Eo(pair_.Eo());
+
+    volScalarField mud(pair_.dispersed().mu());
+    volScalarField muc(pair_.continuous().mu());
+
+    volScalarField muStar((mud + 0.4*muc)/(mud + muc));
+
+    volScalarField muMix
+    (
+        muc
+       *pow(max(1 - pair_.dispersed(), 1e-3), -2.5*muStar)
+    );
+
+    volScalarField ReM(Re*muc/muMix);
+    volScalarField CdRe
+    (
+        pos(1000 - ReM)*24.0*(scalar(1) + 0.15*pow(ReM, 0.687))
+      + neg(1000 - ReM)*0.44*ReM
+    );
+
+    volScalarField F((muc/muMix)*sqrt(1 - pair_.dispersed()));
+    F.max(1e-3);
+
+    volScalarField Ealpha((1 + 17.67*pow(F, 0.8571428))/(18.67*F));
+
+    volScalarField CdReEllipse(Ealpha*0.6666*sqrt(Eo)*Re);
+
+    return
+        pos(CdReEllipse - CdRe)
+       *min(CdReEllipse, Re*sqr(1 - pair_.dispersed())*2.66667)
+      + neg(CdReEllipse - CdRe)*CdRe;
+}
+
+
+// ************************************************************************* //

applications/solvers/multiphase/twoPhaseEulerFoam/interfacialModels/dragModels/IshiiZuber/IshiiZuber.H

+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | Copyright (C) 2014 OpenFOAM Foundation
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+
+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::dragModels::IshiiZuber
+
+Description
+    Ishii and Zuber (1979) drag model for dense dispersed bubbly flows.
+
+    Reference:
+    \verbatim
+        "Drag Coefficient and relative velocity in bubbly, droplet and
+         particulate flows",
+        Ishii, M., Zuber, N.,
+        AIChE Journal 5, Vol. 25, 1979, pp. 843-855.
+    \endverbatim
+
+SourceFiles
+    IshiiZuber.C
+
+\*---------------------------------------------------------------------------*/
+
+#ifndef IshiiZuber_H
+#define IshiiZuber_H
+
+#include "dragModel.H"
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+namespace Foam
+{
+
+class phasePair;
+
+namespace dragModels
+{
+
+/*---------------------------------------------------------------------------*\
+                           Class IshiiZuber Declaration
+\*---------------------------------------------------------------------------*/
+
+class IshiiZuber
+:
+    public dragModel
+{
+
+public:
+
+    //- Runtime type information
+    TypeName("IshiiZuber");
+
+
+    // Constructors
+
+        //- Construct from a dictionary and a phase pair
+        IshiiZuber
+        (
+            const dictionary& dict,
+            const phasePair& pair,
+            const bool registerObject
+        );
+
+
+    //- Destructor
+    virtual ~IshiiZuber();
+
+
+    // Member Functions
+
+        //- Drag coefficient
+        virtual tmp<volScalarField> CdRe() const;
+};
+
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+} // End namespace dragModels
+} // End namespace Foam
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+#endif
+
+// ************************************************************************* //