DICSmoother.C

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License
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#include "DICSmoother.H"
#include "DICPreconditioner.H"

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

namespace Foam
{
    defineTypeNameAndDebug(DICSmoother, 0);

    lduMatrix::smoother::addsymMatrixConstructorToTable<DICSmoother>
        addDICSmootherSymMatrixConstructorToTable_;
}


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

Foam::DICSmoother::DICSmoother
(
    const word& fieldName,
    const lduMatrix& matrix,
    const FieldField<Field, scalar>& interfaceBouCoeffs,
    const FieldField<Field, scalar>& interfaceIntCoeffs,
    const lduInterfaceFieldPtrsList& interfaces
)
:
    lduMatrix::smoother
    (
        fieldName,
        matrix,
        interfaceBouCoeffs,
        interfaceIntCoeffs,
        interfaces
    ),
    rD_(matrix_.diag())
{
    DICPreconditioner::calcReciprocalD(rD_, matrix_);
}


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

void Foam::DICSmoother::smooth
(
    scalarField& psi,
    const scalarField& source,
    const direction cmpt,
    const label nSweeps
) const
{
    const scalar* const __restrict__ rDPtr = rD_.begin();
    const scalar* const __restrict__ upperPtr = matrix_.upper().begin();
    const label* const __restrict__ uPtr =
        matrix_.lduAddr().upperAddr().begin();
    const label* const __restrict__ lPtr =
        matrix_.lduAddr().lowerAddr().begin();

    // Temporary storage for the residual
    scalarField rA(rD_.size());
    scalar* __restrict__ rAPtr = rA.begin();

    for (label sweep=0; sweep<nSweeps; sweep++)
    {
        matrix_.residual
        (
            rA,
            psi,
            source,
            interfaceBouCoeffs_,
            interfaces_,
            cmpt
        );

        rA *= rD_;

        label nFaces = matrix_.upper().size();
        for (label facei=0; facei<nFaces; facei++)
        {
            label u = uPtr[facei];
            rAPtr[u] -= rDPtr[u]*upperPtr[facei]*rAPtr[lPtr[facei]];
        }

        label nFacesM1 = nFaces - 1;
        for (label facei=nFacesM1; facei>=0; facei--)
        {
            label l = lPtr[facei];
            rAPtr[l] -= rDPtr[l]*upperPtr[facei]*rAPtr[uPtr[facei]];
        }

        psi += rA;
    }
}


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