kEpsilon.C

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    Copyright (C) 2007-2023 PCOpt/NTUA
    Copyright (C) 2013-2023 FOSS GP
    Copyright (C) 2019-2020 OpenCFD Ltd.
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.
 
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#include "kEpsilon.H"
#include "addToRunTimeSelectionTable.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace incompressible
{
namespace RASVariables
{
 
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
defineTypeNameAndDebug(kEpsilon, 0);
addToRunTimeSelectionTable(RASModelVariables, kEpsilon, dictionary);
 
 
// * * * * * * * * * * * * Protected Member Functions  * * * * * * * * * * * //
 
void kEpsilon::allocateMeanFields()
{
    RASModelVariables::allocateMeanFields();
    if (solverControl_.average())
    {
        GMean_.reset
        (
            new volScalarField::Internal
            (
                IOobject
                (
                    "GMean",
                    mesh_.time().timeName(),
                    mesh_,
                    IOobject::READ_IF_PRESENT,
                    IOobject::AUTO_WRITE
                ),
                mesh_,
                dimensionedScalar(dimArea/pow3(dimTime), Zero)
            )
        );
    }
}
 
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
kEpsilon::kEpsilon
(
    const fvMesh& mesh,
    const solverControl& SolverControl
)
:
    RASModelVariables(mesh, SolverControl)
{
    TMVar1BaseName_ = "k";
    TMVar2BaseName_ = "epsilon";
 
    TMVar1Ptr_.ref(mesh_.lookupObjectRef<volScalarField>(TMVar1BaseName_));
    TMVar2Ptr_.ref(mesh_.lookupObjectRef<volScalarField>(TMVar2BaseName_));
    nutPtr_.ref(mesh_.lookupObjectRef<volScalarField>(nutBaseName_));
 
    allocateInitValues();
    allocateMeanFields();
}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
tmp<volScalarField::Internal> kEpsilon::computeG()
{
    const turbulenceModel& turbModel = mesh_.lookupObject<turbulenceModel>
    (
         IOobject::groupName
         (
             turbulenceModel::propertiesName,
             TMVar2().internalField().group()
         )
    );
    // Recompute G and modify values next to the walls
    // Ideally, grad(U) should be cached to avoid the overhead
    const volVectorField& U = turbModel.U();
    tmp<volTensorField> tgradU = fvc::grad(U);
    volScalarField::Internal GbyNu0
    (
        IOobject::scopedName(this->type(), "GbyNu"),
        (tgradU() && devTwoSymm(tgradU()))
    );
 
    // NB: leave tmp registered (for correctBoundaryConditions)
    auto tG =
        tmp<volScalarField::Internal>::New
        (
            turbModel.GName(),
            nutRefInst()*GbyNu0
        );
    // Use correctBoundaryConditions instead of updateCoeffs to avoid
    // messing with updateCoeffs in the next iteration of omegaEqn
    TMVar2Inst().correctBoundaryConditions();
 
    return tG;
}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
tmp<volScalarField::Internal> kEpsilon::G()
{
    if (solverControl_.useAveragedFields())
    {
        DebugInfo
            << "Using GMean" << endl;
        return tmp<volScalarField::Internal>(GMean_());
    }
    DebugInfo
        << "Using instantaneous G" << endl;
    return computeG();
}
 
 
void kEpsilon::computeMeanFields()
{
    RASModelVariables::computeMeanFields();
    if (solverControl_.doAverageIter())
    {
        const label iAverageIter = solverControl_.averageIter();
        scalar avIter(iAverageIter);
        scalar oneOverItP1 = 1./(avIter + 1);
        scalar mult = avIter*oneOverItP1;
        GMean_() = GMean_()*mult + computeG()*oneOverItP1;
    }
}
 
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace RASVariables
} // End namespace incompressible
} // End namespace Foam
 
// ************************************************************************* //