Viscoelastic model update: linear Maxwell and upper convected Maxvell. Jovani Favero and Miguel Nobrega

src/transportModels/viscoelastic/Make/files

@@ -6,7 +6,8 @@ viscoelasticLaws/viscoelasticLaw/newViscoelasticLaw.C
 viscoelasticLaws/LPTT/LPTT.C
 viscoelasticLaws/EPTT/EPTT.C
 viscoelasticLaws/Oldroyd-B/Oldroyd_B.C
-viscoelasticLaws/UpperConvectedMaxwell/UpperConvectedMaxwell.C
+viscoelasticLaws/linearMaxwell/linearMaxwell.C
+viscoelasticLaws/UCM/UCM.C
 viscoelasticLaws/Giesekus/Giesekus.C
 viscoelasticLaws/FENE-CR/FENE_CR.C
 viscoelasticLaws/FENE-P/FENE_P.C

src/transportModels/viscoelastic/viscoelasticLaws/UCM/UCM.C

@@ -23,26 +23,21 @@ License
 
 \*---------------------------------------------------------------------------*/
 
-#include "UpperConvectedMaxwell.H"
+#include "UCM.H"
 #include "addToRunTimeSelectionTable.H"
 
 // * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
 namespace Foam
 {
-    defineTypeNameAndDebug(UpperConvectedMaxwell, 0);
-    addToRunTimeSelectionTable
-    (
-        viscoelasticLaw,
-        UpperConvectedMaxwell,
-        dictionary
-    );
+    defineTypeNameAndDebug(UCM, 0);
+    addToRunTimeSelectionTable(viscoelasticLaw, UCM, dictionary);
 }
 
 
 // * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
-Foam::UpperConvectedMaxwell::UpperConvectedMaxwell
+Foam::UCM::UCM
 (
     const word& name,
     const volVectorField& U,
@@ -64,7 +59,6 @@ Foam::UpperConvectedMaxwell::UpperConvectedMaxwell
         U.mesh()
     ),
     rho_(dict.lookup("rho")),
-    etaS_(dict.lookup("etaS")),
     etaP_(dict.lookup("etaP")),
     lambda_(dict.lookup("lambda"))
 {}
@@ -72,8 +66,7 @@ Foam::UpperConvectedMaxwell::UpperConvectedMaxwell
 
 // * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
-Foam::tmp<Foam::fvVectorMatrix>
-Foam::UpperConvectedMaxwell::divTau(volVectorField& U) const
+Foam::tmp<Foam::fvVectorMatrix> Foam::UCM::divTau(volVectorField& U) const
 {
     dimensionedScalar etaPEff = etaP_;
 
@@ -81,16 +74,15 @@ Foam::UpperConvectedMaxwell::divTau(volVectorField& U) const
     (
         fvc::div(tau_/rho_, "div(tau)")
       - fvc::laplacian(etaPEff/rho_, U, "laplacian(etaPEff,U)")
-      + fvm::laplacian( (etaPEff + etaS_)/rho_, U, "laplacian(etaPEff+etaS,U)")
+      + fvm::laplacian( (etaPEff)/rho_, U, "laplacian(etaPEff+etaS,U)")
     );
 }
 
 
-void Foam::UpperConvectedMaxwell::correct()
+void Foam::UCM::correct()
 {
     // Velocity gradient tensor
-    const tmp<volTensorField> tL = fvc::grad(U());
-    const volTensorField& L = tL();
+    volTensorField L = fvc::grad(U());
 
     // Convected derivate term
     volTensorField C = tau_ & L;

src/transportModels/viscoelastic/viscoelasticLaws/UCM/UCM.H

@@ -0,0 +1,130 @@
+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | foam-extend: Open Source CFD
+   \\    /   O peration     | Version:     3.2
+    \\  /    A nd           | Web:         http://www.foam-extend.org
+     \\/     M anipulation  | For copyright notice see file Copyright
+-------------------------------------------------------------------------------
+License
+    This file is part of foam-extend.
+
+    foam-extend 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.
+
+    foam-extend 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 foam-extend.  If not, see <http://www.gnu.org/licenses/>.
+
+Class
+    UCM
+
+Description
+    UCM non linear viscoelastic fluid model (BIRD et al., 1987).
+
+Author
+    Jovani L. Favero.  All rights reserved
+
+SourceFiles
+    UCM.C
+
+\*---------------------------------------------------------------------------*/
+
+#ifndef UCM_H
+#define UCM_H
+
+#include "viscoelasticLaw.H"
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+namespace Foam
+{
+
+/*---------------------------------------------------------------------------*\
+                           Class UCM Declaration
+\*---------------------------------------------------------------------------*/
+
+class UCM
+:
+    public viscoelasticLaw
+{
+    // Private data
+
+        //- Transported viscoelastic stress
+        volSymmTensorField tau_;
+
+
+        // Model constants
+
+            //- Density
+            dimensionedScalar rho_;
+
+            //- Zero shear rate polymer viscosity
+            dimensionedScalar etaP_;
+
+            //- Relaxation time
+            dimensionedScalar lambda_;
+
+
+    // Private Member Functions
+
+        //- Disallow default bitwise copy construct
+        UCM(const UCM&);
+
+        //- Disallow default bitwise assignment
+        void operator=(const UCM&);
+
+
+public:
+
+    //- Runtime type information
+    TypeName("UCM");
+
+    // Constructors
+
+        //- Construct from components
+        UCM
+        (
+            const word& name,
+            const volVectorField& U,
+            const surfaceScalarField& phi,
+            const dictionary& dict
+        );
+
+
+    // Destructor
+
+        virtual ~UCM()
+        {}
+
+
+    // Member Functions
+
+        //- Return the viscoelastic stress tensor
+        virtual tmp<volSymmTensorField> tau() const
+        {
+            return tau_;
+        }
+
+        //- Return the coupling term for the momentum equation
+        virtual tmp<fvVectorMatrix> divTau(volVectorField& U) const;
+
+        //- Correct the viscoelastic stress
+        virtual void correct();
+};
+
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+} // End namespace Foam
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+#endif
+
+// ************************************************************************* //

src/transportModels/viscoelastic/viscoelasticLaws/linearMaxwell/linearMaxwell.C

@@ -0,0 +1,105 @@
+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | foam-extend: Open Source CFD
+   \\    /   O peration     | Version:     3.2
+    \\  /    A nd           | Web:         http://www.foam-extend.org
+     \\/     M anipulation  | For copyright notice see file Copyright
+-------------------------------------------------------------------------------
+License
+    This file is part of foam-extend.
+
+    foam-extend 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.
+
+    foam-extend 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 foam-extend.  If not, see <http://www.gnu.org/licenses/>.
+
+\*---------------------------------------------------------------------------*/
+
+#include "linearMaxwell.H"
+#include "addToRunTimeSelectionTable.H"
+
+// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
+
+namespace Foam
+{
+    defineTypeNameAndDebug(linearMaxwell, 0);
+    addToRunTimeSelectionTable(viscoelasticLaw, linearMaxwell, dictionary);
+}
+
+
+// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
+
+Foam::linearMaxwell::linearMaxwell
+(
+    const word& name,
+    const volVectorField& U,
+    const surfaceScalarField& phi,
+    const dictionary& dict
+)
+:
+    viscoelasticLaw(name, U, phi),
+    tau_
+    (
+        IOobject
+        (
+            "tau" + name,
+            U.time().timeName(),
+            U.mesh(),
+            IOobject::MUST_READ,
+            IOobject::AUTO_WRITE
+        ),
+        U.mesh()
+    ),
+    rho_(dict.lookup("rho")),
+    etaS_(dict.lookup("etaS")),
+    etaP_(dict.lookup("etaP")),
+    lambda_(dict.lookup("lambda"))
+{}
+
+
+// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
+
+Foam::tmp<Foam::fvVectorMatrix> Foam::linearMaxwell::divTau(volVectorField& U) const
+{
+    dimensionedScalar etaPEff = etaP_;
+
+    return
+    (
+        fvc::div(tau_/rho_, "div(tau)")
+      - fvc::laplacian(etaPEff/rho_, U, "laplacian(etaPEff,U)")
+      + fvm::laplacian( (etaPEff + etaS_)/rho_, U, "laplacian(etaPEff+etaS,U)")
+    );
+}
+
+
+void Foam::linearMaxwell::correct()
+{
+    // Velocity gradient tensor
+    volTensorField L = fvc::grad(U());
+
+    // Twice the rate of deformation tensor
+    volSymmTensorField twoD = twoSymm(L);
+
+     // Stress transport equation
+    fvSymmTensorMatrix tauEqn
+    (
+        fvm::ddt(tau_)
+     ==
+        etaP_/lambda_*twoD
+      - fvm::Sp( 1/lambda_, tau_)
+    );
+
+    tauEqn.relax();
+    tauEqn.solve();
+}
+
+
+// ************************************************************************* //

src/transportModels/viscoelastic/viscoelasticLaws/linearMaxwell/linearMaxwell.H

@@ -22,21 +22,21 @@ License
     along with foam-extend.  If not, see <http://www.gnu.org/licenses/>.
 
 Class
-    UpperConvectedMaxwell
+    linearMaxwell
 
 Description
-    UpperConvectedMaxwell linear viscoelastic fluid model (UpperConvectedMaxwell, J.C., 1867).
+    Maxwell linear viscoelastic fluid model (linearMaxwell, J.C., 1867).
 
 Author
     Jovani L. Favero.  All rights reserved
 
 SourceFiles
-    UpperConvectedMaxwell.C
+    linearMaxwell.C
 
 \*---------------------------------------------------------------------------*/
 
-#ifndef UpperConvectedMaxwell_H
-#define UpperConvectedMaxwell_H
+#ifndef linearMaxwell_H
+#define linearMaxwell_H
 
 #include "viscoelasticLaw.H"
 
@@ -46,10 +46,10 @@ namespace Foam
 {
 
 /*---------------------------------------------------------------------------*\
-                           Class UpperConvectedMaxwell Declaration
+                           Class linearMaxwell Declaration
 \*---------------------------------------------------------------------------*/
 
-class UpperConvectedMaxwell
+class linearMaxwell
 :
     public viscoelasticLaw
 {
@@ -77,21 +77,21 @@ class UpperConvectedMaxwell
     // Private Member Functions
 
         //- Disallow default bitwise copy construct
-        UpperConvectedMaxwell(const UpperConvectedMaxwell&);
+        linearMaxwell(const linearMaxwell&);
 
         //- Disallow default bitwise assignment
-        void operator=(const UpperConvectedMaxwell&);
+        void operator=(const linearMaxwell&);
 
 
 public:
 
     //- Runtime type information
-    TypeName("UpperConvectedMaxwell");
+    TypeName("linearMaxwell");
 
     // Constructors
 
         //- Construct from components
-        UpperConvectedMaxwell
+        linearMaxwell
         (
             const word& name,
             const volVectorField& U,
@@ -102,7 +102,7 @@ public:
 
     // Destructor
 
-        virtual ~UpperConvectedMaxwell()
+        virtual ~linearMaxwell()
         {}