DICSmoother.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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    under the terms of the GNU General Public License as published by
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    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.
 
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#include "DICSmoother.H"
#include "DICPreconditioner.H"
#include "PrecisionAdaptor.H"
#include <algorithm>
 
// * * * * * * * * * * * * * * 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().size())
{
    const scalarField& diag = matrix_.diag();
    std::copy(diag.begin(), diag.end(), rD_.begin());
 
    DICPreconditioner::calcReciprocalD(rD_, matrix_);
}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
void Foam::DICSmoother::smooth
(
    solveScalarField& psi,
    const scalarField& source,
    const direction cmpt,
    const label nSweeps
) const
{
    const solveScalar* 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
    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 facei=0; facei<nFaces; facei++)
        {
            const label u = uPtr[facei];
            rAPtr[u] -= rDPtr[u]*upperPtr[facei]*rAPtr[lPtr[facei]];
        }
 
        const label nFacesM1 = nFaces - 1;
        for (label facei=nFacesM1; facei>=0; facei--)
        {
            const label l = lPtr[facei];
            rAPtr[l] -= rDPtr[l]*upperPtr[facei]*rAPtr[uPtr[facei]];
        }
 
        psi += rA;
    }
}
 
 
void Foam::DICSmoother::scalarSmooth
(
    solveScalarField& psi,
    const solveScalarField& source,
    const direction cmpt,
    const label nSweeps
) const
{
    smooth
    (
        psi,
        ConstPrecisionAdaptor<scalar, solveScalar>(source),
        cmpt,
        nSweeps
    );
}
 
 
// ************************************************************************* //