TGaussSeidelSmoother.C

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    Copyright (C) 2017-2023 OpenCFD Ltd.
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#include "TGaussSeidelSmoother.H"
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
template<class Type, class DType, class LUType>
Foam::TGaussSeidelSmoother<Type, DType, LUType>::TGaussSeidelSmoother
(
    const word& fieldName,
    const LduMatrix<Type, DType, LUType>& matrix
)
:
    LduMatrix<Type, DType, LUType>::smoother
    (
        fieldName,
        matrix
    ),
    rD_(matrix.diag().size())
{
    const label nCells = matrix.diag().size();
    const DType* const __restrict__ diagPtr = matrix.diag().begin();
    DType* __restrict__ rDPtr = rD_.begin();
 
    for (label celli=0; celli<nCells; celli++)
    {
        rDPtr[celli] = inv(diagPtr[celli]);
    }
}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
template<class Type, class DType, class LUType>
void Foam::TGaussSeidelSmoother<Type, DType, LUType>::smooth
(
    const word& fieldName_,
    Field<Type>& psi,
    const LduMatrix<Type, DType, LUType>& matrix_,
    const Field<DType>& rD_,
    const label nSweeps
)
{
    Type* __restrict__ psiPtr = psi.begin();
 
    const label nCells = psi.size();
 
    Field<Type> bPrime(nCells);
    Type* __restrict__ bPrimePtr = bPrime.begin();
 
    const DType* const __restrict__ rDPtr = rD_.begin();
 
    const LUType* const __restrict__ upperPtr =
        matrix_.upper().begin();
 
    const LUType* const __restrict__ lowerPtr =
        matrix_.lower().begin();
 
    const label* const __restrict__ uPtr =
        matrix_.lduAddr().upperAddr().begin();
 
    const label* const __restrict__ ownStartPtr =
        matrix_.lduAddr().ownerStartAddr().begin();
 
 
    // Parallel boundary initialisation.  The parallel boundary is treated
    // as an effective jacobi interface in the boundary.
    // Note: there is a change of sign in the coupled
    // interface update to add the contibution to the r.h.s.
 
    for (label sweep=0; sweep<nSweeps; sweep++)
    {
        bPrime = matrix_.source();
 
        const label startRequest = UPstream::nRequests();
 
        matrix_.initMatrixInterfaces
        (
            false,
            matrix_.interfacesUpper(),
            psi,
            bPrime
        );
 
        matrix_.updateMatrixInterfaces
        (
            false,
            matrix_.interfacesUpper(),
            psi,
            bPrime,
            startRequest
        );
 
        Type curPsi;
        label fStart;
        label fEnd = ownStartPtr[0];
 
        for (label celli=0; celli<nCells; celli++)
        {
            // Start and end of this row
            fStart = fEnd;
            fEnd = ownStartPtr[celli + 1];
 
            // Get the accumulated neighbour side
            curPsi = bPrimePtr[celli];
 
            // Accumulate the owner product side
            for (label curFace=fStart; curFace<fEnd; curFace++)
            {
                curPsi -= dot(upperPtr[curFace], psiPtr[uPtr[curFace]]);
            }
 
            // Finish current psi
            curPsi = dot(rDPtr[celli], curPsi);
 
            // Distribute the neighbour side using current psi
            for (label curFace=fStart; curFace<fEnd; curFace++)
            {
                bPrimePtr[uPtr[curFace]] -= dot(lowerPtr[curFace], curPsi);
            }
 
            psiPtr[celli] = curPsi;
        }
    }
}
 
 
template<class Type, class DType, class LUType>
void Foam::TGaussSeidelSmoother<Type, DType, LUType>::smooth
(
    Field<Type>& psi,
    const label nSweeps
) const
{
    smooth(this->fieldName_, psi, this->matrix_, rD_, nSweeps);
}
 
 
// ************************************************************************* //