DILUSmoother.C

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    Copyright (C) 2011-2015 OpenFOAM Foundation
    Copyright (C) 2019 OpenCFD Ltd.
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License
    This file is part of OpenFOAM.

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#include "DILUSmoother.H"
#include "DILUPreconditioner.H"
#include "PrecisionAdaptor.H"
#include <algorithm>

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

namespace Foam
{
    defineTypeNameAndDebug(DILUSmoother, 0);

    lduMatrix::smoother::addasymMatrixConstructorToTable<DILUSmoother>
        addDILUSmootherAsymMatrixConstructorToTable_;
}


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

Foam::DILUSmoother::DILUSmoother
(
    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().size())
{
    const scalarField& diag = matrix_.diag();
    std::copy(diag.begin(), diag.end(), rD_.begin());

    DILUPreconditioner::calcReciprocalD(rD_, matrix_);
}


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

void Foam::DILUSmoother::smooth
(
    solveScalarField& psi,
    const scalarField& source,
    const direction cmpt,
    const label nSweeps
) const
{
    const solveScalar* const __restrict__ rDPtr = rD_.begin();

    const label* const __restrict__ uPtr =
        matrix_.lduAddr().upperAddr().begin();
    const label* const __restrict__ lPtr =
        matrix_.lduAddr().lowerAddr().begin();

    const scalar* const __restrict__ upperPtr = matrix_.upper().begin();
    const scalar* const __restrict__ lowerPtr = matrix_.lower().begin();

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

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

        forAll(rA, i)
        {
            rA[i] *= rD_[i];
        }

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

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

        psi += rA;
    }
}


void Foam::DILUSmoother::scalarSmooth
(
    solveScalarField& psi,
    const solveScalarField& source,
    const direction cmpt,
    const label nSweeps
) const
{
    smooth
    (
        psi,
        ConstPrecisionAdaptor<scalar, solveScalar>(source),
        cmpt,
        nSweeps
    );
}


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