NekNonlinSysNewton.h

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///////////////////////////////////////////////////////////////////////////////
//
// File: NekNonlinSysNewton.h
//
// For more information, please see: http://www.nektar.info
//
// The MIT License
//
// Copyright (c) 2006 Division of Applied Mathematics, Brown University (USA),
// Department of Aeronautics, Imperial College London (UK), and Scientific
// Computing and Imaging Institute, University of Utah (USA).
//
// License for the specific language governing rights and limitations under
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
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//
// Description: NekNonlinSysNewton header
//
///////////////////////////////////////////////////////////////////////////////
 
#ifndef NEKTAR_LIB_UTILITIES_LINEAR_ALGEBRA_NEK_NONLINSYS_NEWTON_H
#define NEKTAR_LIB_UTILITIES_LINEAR_ALGEBRA_NEK_NONLINSYS_NEWTON_H
 
#include <LibUtilities/LinearAlgebra/NekNonlinSys.h>
 
namespace Nektar
{
namespace LibUtilities
{
 
class NekNonlinSysNewton;
 
class NekNonlinSysNewton : public NekNonlinSys
{
public:
    /// Constructor for full direct matrix solve.
    friend class MemoryManager<NekNonlinSysNewton>;
 
    LIB_UTILITIES_EXPORT static NekNonlinSysSharedPtr create(
        const LibUtilities::SessionReaderSharedPtr &pSession,
        const LibUtilities::CommSharedPtr &vComm, const int nDimen,
        const NekSysKey &pKey)
    {
        NekNonlinSysSharedPtr p =
            MemoryManager<NekNonlinSysNewton>::AllocateSharedPtr(
                pSession, vComm, nDimen, pKey);
        p->InitObject();
        return p;
    }
 
    static std::string className;
    LIB_UTILITIES_EXPORT NekNonlinSysNewton(
        const LibUtilities::SessionReaderSharedPtr &pSession,
        const LibUtilities::CommSharedPtr &vComm, const int nscale,
        const NekSysKey &pKey);
    LIB_UTILITIES_EXPORT ~NekNonlinSysNewton();
 
protected:
    NekDouble m_SysResNorm0;
    NekDouble m_SysResNorm;
 
    int m_InexactNewtonForcing = 0;
    NekDouble m_forcingGamma   = 1.0;
    NekDouble m_forcingAlpha   = 0.5 * (1.0 + sqrt(5));
 
    virtual void v_InitObject() override;
 
    virtual int v_SolveSystem(const int nGlobal,
                              const Array<OneD, const NekDouble> &pInput,
                              Array<OneD, NekDouble> &pOutput, const int nDir,
                              const NekDouble tol,
                              const NekDouble factor) override;
 
    virtual bool v_ConvergenceCheck(
        const int nIteration, const Array<OneD, const NekDouble> &Residual,
        const NekDouble tol) override;
 
    virtual void v_SetupNekNonlinSystem(
        const int nGlobal, const Array<OneD, const NekDouble> &pInput,
        const Array<OneD, const NekDouble> &pSource, const int nDir) override;
 
private:
    void CalcInexactNewtonForcing(const int &k, NekDouble &resnormOld,
                                  const NekDouble &resnorm, NekDouble &forcing);
};
} // namespace LibUtilities
} // namespace Nektar
 
#endif