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========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Copyright (C) 2011-2026 OpenFOAM Foundation
\\/ M anipulation |
-------------------------------------------------------------------------------
License
This file is part of OpenFOAM.
OpenFOAM is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
\*---------------------------------------------------------------------------*/
#include "PCG.H"
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
namespace Foam
{
defineTypeNameAndDebug(PCG, 0);
lduMatrix::solver::addsymMatrixConstructorToTable<PCG>
addPCGSymMatrixConstructorToTable_;
}
// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
Foam::PCG::PCG
(
const word& fieldName,
const lduMatrix& matrix,
const Field<Field<scalar>>& interfaceBouCoeffs,
const Field<Field<scalar>>& interfaceIntCoeffs,
const lduInterfaceFieldPtrsList& interfaces,
const dictionary& solverControls
)
:
lduMatrix::solver
(
fieldName,
matrix,
interfaceBouCoeffs,
interfaceIntCoeffs,
interfaces,
solverControls
)
{}
// * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
Foam::solverPerformance Foam::PCG::solve
(
scalarField& psi,
const scalarField& source,
const direction cmpt
) const
{
// --- Setup class containing solver performance data
solverPerformance solverPerf
(
lduMatrix::preconditioner::getName(controlDict_) + typeName,
fieldName_
);
label nCells = psi.size();
scalar* __restrict__ psiPtr = psi.begin();
scalarField pA(nCells);
scalar* __restrict__ pAPtr = pA.begin();
scalarField wA(nCells);
scalar* __restrict__ wAPtr = wA.begin();
scalar wArA = solverPerf.great_;
scalar wArAold = wArA;
// --- Calculate A.psi
matrix_.Amul(wA, psi, interfaceBouCoeffs_, interfaces_, cmpt);
// --- Calculate initial residual field
scalarField rA(source - wA);
scalar* __restrict__ rAPtr = rA.begin();
// --- Calculate normalisation factor
scalar normFactor = this->normFactor(psi, source, wA, pA);
if (lduMatrix::debug >= 2)
{
Info<< " Normalisation factor = " << normFactor << endl;
}
// --- Calculate normalised residual norm
solverPerf.initialResidual() =
gSum(mag(rA), matrix().mesh().comm())/normFactor;
solverPerf.finalResidual() = solverPerf.initialResidual();
// --- Check convergence, solve if not converged
if
(
minIter_ > 0
|| !solverPerf.checkConvergence(tolerance_, relTol_)
)
{
// --- Select and construct the preconditioner
autoPtr<lduMatrix::preconditioner> preconPtr =
lduMatrix::preconditioner::New
(
*this,
controlDict_
);
// --- Solver iteration
do
{
// --- Store previous wArA
wArAold = wArA;
// --- Precondition residual
preconPtr->precondition(wA, rA, cmpt);
// --- Update search directions:
wArA = gSum(wA*rA, matrix().mesh().comm());
if (solverPerf.nIterations() == 0)
{
for (label cell=0; cell<nCells; cell++)
{
pAPtr[cell] = wAPtr[cell];
}
}
else
{
scalar beta = wArA/wArAold;
for (label cell=0; cell<nCells; cell++)
{
pAPtr[cell] = wAPtr[cell] + beta*pAPtr[cell];
}
}
// --- Update preconditioned residual
matrix_.Amul(wA, pA, interfaceBouCoeffs_, interfaces_, cmpt);
scalar wApA = gSum(wA*pA, matrix().mesh().comm());
// --- Test for singularity
if (solverPerf.checkSingularity(mag(wApA)/normFactor)) break;
// --- Update solution and residual:
scalar alpha = wArA/wApA;
for (label cell=0; cell<nCells; cell++)
{
psiPtr[cell] += alpha*pAPtr[cell];
rAPtr[cell] -= alpha*wAPtr[cell];
}
solverPerf.finalResidual() =
gSum(mag(rA), matrix().mesh().comm())/normFactor;
} while
(
(
++solverPerf.nIterations() < maxIter_
&& !solverPerf.checkConvergence(tolerance_, relTol_)
)
|| solverPerf.nIterations() < minIter_
);
}
return solverPerf;
}
// ************************************************************************* //
|