Rosenbrock23.H

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    Copyright (C) 2013-2016 OpenFOAM Foundation
    Copyright (C) 2019 OpenCFD Ltd.
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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.
 
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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
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Class
    Foam::Rosenbrock23
 
Group
    grpODESolvers
 
Description
    L-stable embedded Rosenbrock ODE solver of order (2)3.
 
    References:
    \verbatim
        Sandu, A., Verwer, J. G., Blom, J. G., Spee, E. J., Carmichael, G. R.,
        & Potra, F. A. (1997).
        Benchmarking stiff ODE solvers for atmospheric chemistry problems II:
        Rosenbrock solvers.
        Atmospheric environment, 31(20), 3459-3472.
    \endverbatim
 
SourceFiles
    Rosenbrock23.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef Rosenbrock23_H
#define Rosenbrock23_H
 
#include "ODESolver.H"
#include "adaptiveSolver.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
/*---------------------------------------------------------------------------*\
                           Class Rosenbrock23 Declaration
\*---------------------------------------------------------------------------*/
 
class Rosenbrock23
:
    public ODESolver,
    public adaptiveSolver
{
    // Private data
 
        mutable scalarField k1_;
        mutable scalarField k2_;
        mutable scalarField k3_;
        mutable scalarField err_;
        mutable scalarField dydx_;
        mutable scalarField dfdx_;
        mutable scalarSquareMatrix dfdy_;
        mutable scalarSquareMatrix a_;
        mutable labelList pivotIndices_;
 
        static const scalar
            a21, a31, a32,
            c21, c31, c32,
            b1, b2, b3,
            e1, e2, e3,
            gamma,
            c2, c3,
            d1, d2, d3;
 
 
public:
 
    //- Runtime type information
    TypeName("Rosenbrock23");
 
 
    // Constructors
 
        //- Construct from ODESystem
        Rosenbrock23(const ODESystem& ode, const dictionary& dict);
 
 
    //- Destructor
    virtual ~Rosenbrock23() = default;
 
 
    // Member Functions
 
        //- Inherit solve from ODESolver
        using ODESolver::solve;
 
        //- Resize the ODE solver
        virtual bool resize();
 
        //- Solve a single step dx and return the error
        virtual scalar solve
        (
            const scalar x0,
            const scalarField& y0,
            const scalarField& dydx0,
            const scalar dx,
            scalarField& y
        ) const;
 
        //- Solve the ODE system and the update the state
        virtual void solve
        (
            scalar& x,
            scalarField& y,
            scalar& dxTry
        ) const;
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //