PreconditionerLinearWithBlock.cpp

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///////////////////////////////////////////////////////////////////////////////
//
// File: PreconditionerLinearWithBlock.cpp
//
// 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).
//
// 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
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// Software is furnished to do so, subject to the following conditions:
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// Description: PreconditionerLinearWithBlock definition
//
///////////////////////////////////////////////////////////////////////////////
 
#include <LocalRegions/MatrixKey.h>
#include <MultiRegions/GlobalMatrixKey.h>
#include <MultiRegions/PreconditionerLinearWithBlock.h>
#include <cmath>
 
using namespace std;
 
namespace Nektar::MultiRegions
{
/**
 * Registers the class with the Factory.
 */
 
string PreconditionerLinearWithBlock::className =
    GetPreconFactory().RegisterCreatorFunction(
        "FullLinearSpaceWithBlock", PreconditionerLinearWithBlock::create,
        "Full Linear space and block preconditioning");
 
/**
 * @class PreconditionerLinearWithBlock
 *
 * This class implements preconditioning for the conjugate
 * gradient matrix solver.
 */
 
PreconditionerLinearWithBlock::PreconditionerLinearWithBlock(
    const std::shared_ptr<GlobalLinSys> &plinsys,
    const AssemblyMapSharedPtr &pLocToGloMap)
    : Preconditioner(plinsys, pLocToGloMap)
{
}
 
/**
 *
 */
void PreconditionerLinearWithBlock::v_InitObject()
{
    m_linSpacePrecon = GetPreconFactory().CreateInstance(
        "FullLinearSpace", m_linsys.lock(), m_locToGloMap.lock());
    m_blockPrecon = GetPreconFactory().CreateInstance("Block", m_linsys.lock(),
                                                      m_locToGloMap.lock());
}
 
/**
 *
 */
void PreconditionerLinearWithBlock::v_BuildPreconditioner()
{
    m_linSpacePrecon->BuildPreconditioner();
    m_blockPrecon->BuildPreconditioner();
}
 
/**
 *
 */
void PreconditionerLinearWithBlock::v_DoPreconditioner(
    const Array<OneD, NekDouble> &pInput, Array<OneD, NekDouble> &pOutput,
    const bool &isLocal)
{
    ASSERTL0(isLocal == false, "PreconditionerLinearWithBlock is only set up "
                               "for Global iteratives sovles");
    int nGlobal = pInput.size();
 
    Array<OneD, NekDouble> OutputBlock(nGlobal, 0.0);
    Array<OneD, NekDouble> OutputLinear(nGlobal, 0.0);
    Array<OneD, NekDouble> InputLinear(nGlobal, 0.0);
 
    // Apply Low Energy preconditioner
    m_blockPrecon->DoPreconditioner(pInput, OutputBlock);
 
    // Apply linear space preconditioner
    m_linSpacePrecon->DoPreconditionerWithNonVertOutput(pInput, pOutput,
                                                        OutputBlock);
}
 
} // namespace Nektar::MultiRegions