laminar.C

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    Copyright (C) 2011-2017 OpenFOAM Foundation
    Copyright (C) 2023 OpenCFD Ltd.
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License
    This file is part of OpenFOAM.

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#include "laminar.H"
#include "addToRunTimeSelectionTable.H"
#include "fvMesh.H"
#include "fvMatrices.H"
#include "Time.H"
#include "volFields.H"
#include "fvmSup.H"
#include "kinematicSingleLayer.H"
#include "extrapolatedCalculatedFvPatchFields.H"

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

namespace Foam
{
namespace regionModels
{
namespace surfaceFilmModels
{

// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //

defineTypeNameAndDebug(laminar, 0);
addToRunTimeSelectionTable(filmTurbulenceModel, laminar, dictionary);

// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //

laminar::laminar
(
    surfaceFilmRegionModel& film,
    const dictionary& dict
)
:
    filmTurbulenceModel(type(), film, dict),
    Cf_(coeffDict_.get<scalar>("Cf"))
{}


// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //

laminar::~laminar()
{}


// * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * * //

tmp<volVectorField> laminar::Us() const
{
    auto tUs = volVectorField::New
    (
        IOobject::scopedName(typeName, "Us"),
        IOobject::NO_REGISTER,
        filmModel_.regionMesh(),
        dimensionedVector(dimVelocity, Zero),
        fvPatchFieldBase::extrapolatedCalculatedType()
    );

    // apply quadratic profile
    tUs.ref() = Foam::sqrt(2.0)*filmModel_.U();
    tUs.ref().correctBoundaryConditions();

    return tUs;
}


tmp<volScalarField> laminar::mut() const
{
    return volScalarField::New
    (
        IOobject::scopedName(typeName, "mut"),
        IOobject::NO_REGISTER,
        filmModel_.regionMesh(),
        dimensionedScalar(dimMass/dimLength/dimTime, Zero)
    );
}


void laminar::correct()
{}


tmp<fvVectorMatrix> laminar::Su(volVectorField& U) const
{
    // local reference to film model
    const kinematicSingleLayer& film =
        static_cast<const kinematicSingleLayer&>(filmModel_);

    // local references to film fields
    const volScalarField& mu = film.mu();
    const volVectorField& Uw = film.Uw();
    const volScalarField& delta = film.delta();
    const volVectorField& Up = film.UPrimary();
    const volScalarField& rhop = film.rhoPrimary();

    // employ simple coeff-based model
    volScalarField Cs("Cs", Cf_*rhop*mag(Up - U));
    volScalarField Cw("Cw", mu/((1.0/3.0)*(delta + film.deltaSmall())));
    Cw.clamp_max(5000.0);

    return
    (
       - fvm::Sp(Cs, U) + Cs*Up // surface contribution
       - fvm::Sp(Cw, U) + Cw*Uw // wall contribution
    );
}


// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

} // End namespace surfaceFilmModels
} // End namespace regionModels
} // End namespace Foam

// ************************************************************************* //