diagonalPreconditioner.C

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#include "diagonalPreconditioner.H"

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

namespace Foam
{
    defineTypeNameAndDebug(diagonalPreconditioner, 0);

    lduMatrix::preconditioner::
        addsymMatrixConstructorToTable<diagonalPreconditioner>
        adddiagonalPreconditionerSymMatrixConstructorToTable_;

    lduMatrix::preconditioner::
        addasymMatrixConstructorToTable<diagonalPreconditioner>
        adddiagonalPreconditionerAsymMatrixConstructorToTable_;
}


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

Foam::diagonalPreconditioner::diagonalPreconditioner
(
    const lduMatrix::solver& sol,
    const dictionary&
)
:
    lduMatrix::preconditioner(sol),
    rD(sol.matrix().diag().size())
{
    scalar* __restrict__ rDPtr = rD.begin();
    const scalar* __restrict__ DPtr = solver_.matrix().diag().begin();

    label nCells = rD.size();

    // Generate reciprocal diagonal
    for (label cell=0; cell<nCells; cell++)
    {
        rDPtr[cell] = 1.0/DPtr[cell];
    }
}


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

void Foam::diagonalPreconditioner::precondition
(
    scalarField& wA,
    const scalarField& rA,
    const direction
) const
{
    scalar* __restrict__ wAPtr = wA.begin();
    const scalar* __restrict__ rAPtr = rA.begin();
    const scalar* __restrict__ rDPtr = rD.begin();

    label nCells = wA.size();

    for (label cell=0; cell<nCells; cell++)
    {
        wAPtr[cell] = rDPtr[cell]*rAPtr[cell];
    }
}


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