Smagorinsky.C

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#include "Smagorinsky.H"
#include "fvModels.H"
#include "fvConstraints.H"

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

namespace Foam
{
namespace LESModels
{

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

template<class BasicMomentumTransportModel>
tmp<volScalarField> Smagorinsky<BasicMomentumTransportModel>::k
(
    const tmp<volTensorField>& gradU
) const
{
    volSymmTensorField D(symm(gradU));

    volScalarField a(this->Ce_/this->delta());
    volScalarField b((2.0/3.0)*tr(D));
    volScalarField c(2*Ck_*this->delta()*(dev(D) && D));

    return volScalarField::New
    (
        IOobject::groupName("k", this->alphaRhoPhi_.group()),
        sqr((-b + sqrt(sqr(b) + 4*a*c))/(2*a))
    );
}


template<class BasicMomentumTransportModel>
void Smagorinsky<BasicMomentumTransportModel>::correctNut()
{
    volScalarField k(this->k(fvc::grad(this->U_)));

    this->nut_ = Ck_*this->delta()*sqrt(k);
    this->nut_.correctBoundaryConditions();
    fvConstraints::New(this->mesh_).constrain(this->nut_);
}


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

template<class BasicMomentumTransportModel>
Smagorinsky<BasicMomentumTransportModel>::Smagorinsky
(
    const alphaField& alpha,
    const rhoField& rho,
    const volVectorField& U,
    const surfaceScalarField& alphaRhoPhi,
    const surfaceScalarField& phi,
    const transportModel& transport,
    const word& type
)
:
    LESeddyViscosity<BasicMomentumTransportModel>
    (
        type,
        alpha,
        rho,
        U,
        alphaRhoPhi,
        phi,
        transport
    ),

    Ck_
    (
        dimensioned<scalar>::lookupOrAddToDict
        (
            "Ck",
            this->coeffDict_,
            0.094
        )
    )
{
    if (type == typeName)
    {
        this->printCoeffs(type);
    }
}


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

template<class BasicMomentumTransportModel>
bool Smagorinsky<BasicMomentumTransportModel>::read()
{
    if (LESeddyViscosity<BasicMomentumTransportModel>::read())
    {
        Ck_.readIfPresent(this->coeffDict());

        return true;
    }
    else
    {
        return false;
    }
}


template<class BasicMomentumTransportModel>
tmp<volScalarField> Smagorinsky<BasicMomentumTransportModel>::epsilon() const
{
    volScalarField k(this->k(fvc::grad(this->U_)));

    return volScalarField::New
    (
        IOobject::groupName("epsilon", this->alphaRhoPhi_.group()),
        this->Ce_*k*sqrt(k)/this->delta()
    );
}


template<class BasicMomentumTransportModel>
void Smagorinsky<BasicMomentumTransportModel>::correct()
{
    LESeddyViscosity<BasicMomentumTransportModel>::correct();
    correctNut();
}


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

} // End namespace LESModels
} // End namespace Foam

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