PCG.H

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/*---------------------------------------------------------------------------*\
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    Copyright (C) 2011-2012 OpenFOAM Foundation
    Copyright (C) 2019 OpenCFD Ltd.
-------------------------------------------------------------------------------
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
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Class
    Foam::PCG

Group
    grpLduMatrixSolvers

Description
    Preconditioned conjugate gradient solver for symmetric lduMatrices
    using a run-time selectable preconditioner.

SourceFiles
    PCG.C

\*---------------------------------------------------------------------------*/

#ifndef PCG_H
#define PCG_H

#include "lduMatrix.H"

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

namespace Foam
{

/*---------------------------------------------------------------------------*\
                             Class PCG Declaration
\*---------------------------------------------------------------------------*/

class PCG
:
    public lduMatrix::solver
{
    // Private Member Data

        //- Cached preconditioner
        mutable autoPtr<lduMatrix::preconditioner> preconPtr_;


    // Private Member Functions

        //- No copy construct
        PCG(const PCG&) = delete;

        //- No copy assignment
        void operator=(const PCG&) = delete;


public:

    //- Runtime type information
    TypeName("PCG");


    // Constructors

        //- Construct from matrix components and solver controls
        PCG
        (
            const word& fieldName,
            const lduMatrix& matrix,
            const FieldField<Field, scalar>& interfaceBouCoeffs,
            const FieldField<Field, scalar>& interfaceIntCoeffs,
            const lduInterfaceFieldPtrsList& interfaces,
            const dictionary& solverControls
        );


    //- Destructor
    virtual ~PCG() = default;


    // Member Functions

        //- Solve the matrix with this solver
        virtual solverPerformance scalarSolve
        (
            solveScalarField& psi,
            const solveScalarField& source,
            const direction cmpt=0
        ) const;

        //- Solve the matrix with this solver
        virtual solverPerformance solve
        (
            scalarField& psi,
            const scalarField& source,
            const direction cmpt=0
        ) const;
};


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

} // End namespace Foam

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

#endif

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