LUscalarMatrix.H

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/*---------------------------------------------------------------------------*\
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  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
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    \\  /    A nd           | www.openfoam.com
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-------------------------------------------------------------------------------
    Copyright (C) 2011-2016 OpenFOAM Foundation
-------------------------------------------------------------------------------
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
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    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/>.
 
Class
    Foam::LUscalarMatrix
 
Description
    Class to perform the LU decomposition on a symmetric matrix.
 
SourceFiles
    LUscalarMatrix.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef Foam_LUscalarMatrix_H
#define Foam_LUscalarMatrix_H
 
#include "scalarMatrices.H"
#include "labelList.H"
#include "FieldField.H"
#include "lduInterfaceFieldPtrsList.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
// Forward Declarations
class lduMatrix;
class procLduMatrix;
 
/*---------------------------------------------------------------------------*\
                           Class LUscalarMatrix Declaration
\*---------------------------------------------------------------------------*/
 
class LUscalarMatrix
:
    public scalarSquareMatrix
{
    // Private Data
 
        //- Communicator to use
        const label comm_;
 
        //- Processor matrix offsets
        labelList procOffsets_;
 
        //- The pivot indices used in the LU decomposition
        labelList pivotIndices_;
 
 
    // Private Member Functions
 
        //- Convert the given lduMatrix into this LUscalarMatrix
        void convert
        (
            const lduMatrix& ldum,
            const FieldField<Field, scalar>& interfaceCoeffs,
            const lduInterfaceFieldPtrsList& interfaces
        );
 
        //- Convert the given list of procLduMatrix into this LUscalarMatrix
        //- on the master processor
        void convert(const PtrList<procLduMatrix>& lduMatrices);
 
 
        //- Print the ratio of the mag-sum of the off-diagonal coefficients
        //- to the mag-diagonal
        void printDiagonalDominance() const;
 
 
public:
 
    // Declare name of the class and its debug switch
    ClassName("LUscalarMatrix");
 
 
    // Constructors
 
        //- Default construct
        LUscalarMatrix() noexcept;
 
        //- Construct from and perform LU decomposition of the given matrix
        explicit LUscalarMatrix(const scalarSquareMatrix& mat);
 
        //- Construct from lduMatrix and perform LU decomposition.
        //- In parallel it assembles the matrix on the master.
        LUscalarMatrix
        (
            const lduMatrix& ldum,
            const FieldField<Field, scalar>& interfaceCoeffs,
            const lduInterfaceFieldPtrsList& interfaces
        );
 
 
    // Member Functions
 
        //- Perform the LU decomposition of the matrix
        void decompose(const scalarSquareMatrix& mat);
 
        //- Solve the linear system with the given source
        //  and returning the solution in the Field argument x.
        //  This function may be called with the same field for x and source.
        template<class Type>
        void solve(List<Type>& x, const UList<Type>& source) const;
 
        //- Solve the linear system with the given source
        //  returning the solution
        template<class Type>
        tmp<Field<Type>> solve(const UList<Type>& source) const;
 
        //- Set M to the inverse of this square matrix
        void inv(scalarSquareMatrix& M) const;
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#ifdef NoRepository
    #include "LUscalarMatrixTemplates.C"
#endif
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //