Smagorinsky.C

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
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    \\  /    A nd           | Copyright (C) 1991-2010 OpenCFD Ltd.
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#include "Smagorinsky.H"
#include <OpenFOAM/addToRunTimeSelectionTable.H>

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

namespace Foam
{
namespace compressible
{
namespace LESModels
{

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

defineTypeNameAndDebug(Smagorinsky, 0);
addToRunTimeSelectionTable(LESModel, Smagorinsky, dictionary);


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

void Smagorinsky::updateSubGridScaleFields(const volTensorField& gradU)
{
    volSymmTensorField D = symm(gradU);

    volScalarField a = ce_/delta();
    volScalarField b = (2.0/3.0)*tr(D);
    volScalarField c = 2*ck_*delta()*(dev(D) && D);

    k_ = sqr((-b + sqrt(sqr(b) + 4*a*c))/(2*a));

    muSgs_ = ck_*rho()*delta()*sqrt(k_);
    muSgs_.correctBoundaryConditions();

    alphaSgs_ = muSgs_/Prt_;
    alphaSgs_.correctBoundaryConditions();
}


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

Smagorinsky::Smagorinsky
(
    const volScalarField& rho,
    const volVectorField& U,
    const surfaceScalarField& phi,
    const basicThermo& thermoPhysicalModel
)
:
    LESModel(typeName, rho, U, phi, thermoPhysicalModel),
    GenEddyVisc(rho, U, phi, thermoPhysicalModel),

    ck_
    (
        dimensioned<scalar>::lookupOrAddToDict
        (
            "ck",
            coeffDict_,
            0.02
        )
    )
{
    updateSubGridScaleFields(fvc::grad(U));

    printCoeffs();
}


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

void Smagorinsky::correct(const tmp<volTensorField>& gradU)
{
    GenEddyVisc::correct(gradU);
    updateSubGridScaleFields(gradU());
}


bool Smagorinsky::read()
{
    if (GenEddyVisc::read())
    {
        ck_.readIfPresent(coeffDict());

        return true;
    }
    else
    {
        return false;
    }
}


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

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

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