limitVelocity.C

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#include "limitVelocity.H"
#include "volFields.H"
#include "addToRunTimeSelectionTable.H"

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

namespace Foam
{
namespace fv
{
    defineTypeNameAndDebug(limitVelocity, 0);
    addToRunTimeSelectionTable
    (
        fvConstraint,
        limitVelocity,
        dictionary
    );
}
}


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

void Foam::fv::limitVelocity::readCoeffs()
{
    UName_ = coeffs().lookupOrDefault<word>("U", "U");
    max_ = coeffs().lookup<scalar>("max");
}


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

Foam::fv::limitVelocity::limitVelocity
(
    const word& name,
    const word& modelType,
    const dictionary& dict,
    const fvMesh& mesh
)
:
    fvConstraint(name, modelType, dict, mesh),
    set_(coeffs(), mesh),
    UName_(word::null),
    max_(vGreat)
{
    readCoeffs();
}


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

Foam::wordList Foam::fv::limitVelocity::constrainedFields() const
{
    return wordList(1, UName_);
}


bool Foam::fv::limitVelocity::constrain(volVectorField& U) const
{
    const scalar maxSqrU = sqr(max_);

    vectorField& Uif = U.primitiveFieldRef();

    const labelList& cells = set_.cells();

    forAll(cells, i)
    {
        const label celli = cells[i];

        const scalar magSqrUi = magSqr(Uif[celli]);

        if (magSqrUi > maxSqrU)
        {
            Uif[celli] *= sqrt(maxSqrU/magSqrUi);
        }
    }

    // handle boundaries in the case of 'all'
    if (set_.selectionMode() == fvCellSet::selectionModeType::all)
    {
        volVectorField::Boundary& Ubf = U.boundaryFieldRef();

        forAll(Ubf, patchi)
        {
            fvPatchVectorField& Up = Ubf[patchi];

            if (!Up.fixesValue())
            {
                forAll(Up, facei)
                {
                    const scalar magSqrUi = magSqr(Up[facei]);

                    if (magSqrUi > maxSqrU)
                    {
                        Up[facei] *= sqrt(maxSqrU/magSqrUi);
                    }
                }
            }
        }
    }

    return cells.size();
}


void Foam::fv::limitVelocity::updateMesh(const mapPolyMesh& mpm)
{
    set_.updateMesh(mpm);
}


bool Foam::fv::limitVelocity::read(const dictionary& dict)
{
    if (fvConstraint::read(dict))
    {
        set_.read(coeffs());
        readCoeffs();
        return true;
    }
    else
    {
        return false;
    }
}


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