PopeIndex.C

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    Copyright (C) 2022 OpenCFD Ltd.
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License
    This file is part of OpenFOAM.
 
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#include "PopeIndex.H"
#include "resolutionIndexModel.H"
#include "addToRunTimeSelectionTable.H"
 
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
namespace Foam
{
namespace resolutionIndexModels
{
    defineTypeNameAndDebug(PopeIndex, 0);
    addToRunTimeSelectionTable(resolutionIndexModel, PopeIndex, dictionary);
}
}
 
 
// * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
 
Foam::tmp<Foam::volScalarField>
Foam::resolutionIndexModels::PopeIndex::kNum() const
{
    const auto& kSgs = getOrReadField<volScalarField>(kName_);
    const auto& Delta = getOrReadField<volScalarField>(deltaName_);
 
    tmp<volScalarField> th = cbrt(V());
 
    // (CKJ:Eq. 28)
    return Cn_*sqr(th/Delta)*kSgs;
}
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
Foam::resolutionIndexModels::PopeIndex::PopeIndex
(
    const word& name,
    const fvMesh& mesh,
    const dictionary& dict
)
:
    resolutionIndexModel(name, mesh, dict),
    includeKnum_(),
    Cn_(),
    UName_(),
    UMeanName_(),
    kName_(),
    deltaName_()
{
    read(dict);
}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
bool Foam::resolutionIndexModels::PopeIndex::read(const dictionary& dict)
{
    if (!resolutionIndexModel::read(dict))
    {
        return false;
    }
 
    includeKnum_ = dict.getOrDefault<bool>("includeKnum", true);
    if (includeKnum_)
    {
        Cn_ = dict.getOrDefault<scalar>("Cnu", 1.0);
    }
    UName_ = dict.getOrDefault<word>("U", "U");
    UMeanName_ = dict.getOrDefault<word>("UMean", "UMean");
    kName_ = dict.getOrDefault<word>("k", "k");
    deltaName_ = dict.getOrDefault<word>("delta", "delta");
 
    return true;
}
 
 
bool Foam::resolutionIndexModels::PopeIndex::execute()
{
    // Calculate resolved k field
    const auto& U = getOrReadField<volVectorField>(UName_);
    const auto& UMean = getOrReadField<volVectorField>(UMeanName_);
    const volScalarField kRes(0.5*magSqr(U - UMean));
 
    // Calculate subgrid-scale k field
    const auto& kSgs = getOrReadField<volScalarField>(kName_);
 
    // Calculate total k field
    tmp<volScalarField> tkTot = kRes + kSgs;
    if (includeKnum_)
    {
        tkTot.ref() += mag(kNum());
    }
 
 
    // Calculate index field
    auto& index = getOrReadField<volScalarField>(resultName());
 
    const dimensionedScalar kMin(kSgs.dimensions(), SMALL);
 
    // (P:p. 560;CKJ:Eq. 11)
    index = kRes/max(kMin, tkTot);
    index.correctBoundaryConditions();
 
    return true;
}
 
 
bool Foam::resolutionIndexModels::PopeIndex::write()
{
    const auto& index = getOrReadField<volScalarField>(resultName());
 
    Info<< tab << "writing field:" << index.name() << endl;
 
    index.write();
 
    return true;
}
 
 
// ************************************************************************* //