Base class for the development of solvers. More...

#include <DriverArpack.h>

Inheritance diagram for Nektar::SolverUtils::DriverArpack:

Static Public Member Functions
static DriverSharedPtr	create (const LibUtilities::SessionReaderSharedPtr &pSession, const SpatialDomains::MeshGraphSharedPtr &pGraph)
	Creates an instance of this class. More...

Static Public Attributes
static std::string	className
	Name of the class. More...

Protected Member Functions
	DriverArpack (const LibUtilities::SessionReaderSharedPtr pSession, const SpatialDomains::MeshGraphSharedPtr pGraph)
	Constructor. More...

	~DriverArpack () override=default
	Destructor. More...

void	v_InitObject (std::ostream &out=std::cout) override
	Virtual function for initialisation implementation. More...

void	v_Execute (std::ostream &out=std::cout) override
	Virtual function for solve implementation. More...

Protected Member Functions inherited from Nektar::SolverUtils::DriverArnoldi
	DriverArnoldi (const LibUtilities::SessionReaderSharedPtr pSession, const SpatialDomains::MeshGraphSharedPtr pGraph)
	Constructor. More...

	~DriverArnoldi () override=default
	Destructor. More...

void	v_InitObject (std::ostream &out=std::cout) override
	Virtual function for initialisation implementation. More...

void	v_Execute (std::ostream &out=std::cout) override
	Virtual function for solve implementation. More...

void	CopyArnoldiArrayToField (Array< OneD, NekDouble > &array)
	Copy Arnoldi storage to fields. More...

void	CopyFieldToArnoldiArray (Array< OneD, NekDouble > &array)
	Copy fields to Arnoldi storage. More...

void	CopyFwdToAdj ()
	Copy the forward field to the adjoint system in transient growth calculations. More...

void	WriteFld (std::string file, std::vector< Array< OneD, NekDouble > > coeffs)
	Write coefficients to file. More...

void	WriteFld (std::string file, Array< OneD, NekDouble > coeffs)

void	WriteEvs (std::ostream &evlout, const int k, const NekDouble real, const NekDouble imag, NekDouble resid=NekConstants::kNekUnsetDouble, bool DumpInverse=true)

void	MaskInit ()
	Init mask. More...

void	GetMaskInfo (std::vector< std::vector< LibUtilities::EquationSharedPtr > > &selectedDomains, std::set< int > &unselectedVariables)

SOLVER_UTILS_EXPORT void	ArnoldiSummary (std::ostream &out)

Protected Member Functions inherited from Nektar::SolverUtils::Driver
	Driver (const LibUtilities::SessionReaderSharedPtr pSession, const SpatialDomains::MeshGraphSharedPtr pGraph)
	Initialises EquationSystem class members. More...

virtual SOLVER_UTILS_EXPORT void	v_InitObject (std::ostream &out=std::cout)
	Virtual function for initialisation implementation. More...

virtual SOLVER_UTILS_EXPORT void	v_Execute (std::ostream &out=std::cout)=0
	Virtual function for solve implementation. More...

Protected Attributes
int	m_maxn

int	m_maxnev

int	m_maxncv

Protected Attributes inherited from Nektar::SolverUtils::DriverArnoldi
int	m_kdim

int	m_nvec
	Dimension of Krylov subspace. More...

int	m_nits
	Number of vectors to test. More...

NekDouble	m_evtol
	Maxmum number of iterations. More...

NekDouble	m_period
	Tolerance of iterations. More...

bool	m_timeSteppingAlgorithm
	Period of time stepping algorithm. More...

int	m_infosteps
	underlying operator is time stepping More...

int	m_nfields
	interval to dump information if required. More...

NekDouble	m_realShift

NekDouble	m_imagShift

int	m_negatedOp

Array< OneD, NekDouble >	m_real_evl
	Operator in solve call is negated. More...

Array< OneD, NekDouble >	m_imag_evl

bool	m_useMask

Array< OneD, NekDouble >	m_maskCoeffs

Array< OneD, NekDouble >	m_maskPhys

Protected Attributes inherited from Nektar::SolverUtils::Driver
LibUtilities::CommSharedPtr	m_comm
	Communication object. More...

LibUtilities::SessionReaderSharedPtr	m_session
	Session reader object. More...

LibUtilities::SessionReaderSharedPtr	session_LinNS
	Coupling between SFD and arnoldi. More...

SpatialDomains::MeshGraphSharedPtr	m_graph
	MeshGraph object. More...

Array< OneD, EquationSystemSharedPtr >	m_equ
	Equation system to solve. More...

int	m_nequ
	number of equations More...

enum EvolutionOperatorType	m_EvolutionOperator
	Evolution Operator. More...

Static Protected Attributes
static std::string	driverLookupId

Static Protected Attributes inherited from Nektar::SolverUtils::Driver
static std::string	evolutionOperatorLookupIds []

static std::string	evolutionOperatorDef

static std::string	driverDefault

Static Private Attributes
static std::string	arpackProblemTypeLookupIds []

static std::string	arpackProblemTypeDefault

static std::string	ArpackProblemTypeTrans []

Friends
class	MemoryManager< DriverArpack >

Additional Inherited Members
Public Member Functions inherited from Nektar::SolverUtils::DriverArnoldi
Array< OneD, NekDouble >	GetRealEvl (void)

Array< OneD, NekDouble >	GetImagEvl (void)

Public Member Functions inherited from Nektar::SolverUtils::Driver
virtual	~Driver ()
	Destructor. More...

SOLVER_UTILS_EXPORT void	InitObject (std::ostream &out=std::cout)
	Initialise Object. More...

SOLVER_UTILS_EXPORT void	Execute (std::ostream &out=std::cout)
	Execute driver. More...

SOLVER_UTILS_EXPORT Array< OneD, EquationSystemSharedPtr >	GetEqu ()

Detailed Description

Base class for the development of solvers.

Definition at line 46 of file DriverArpack.h.

Constructor & Destructor Documentation

◆ DriverArpack()

Nektar::SolverUtils::DriverArpack::DriverArpack	(	const LibUtilities::SessionReaderSharedPtr	pSession,
		const SpatialDomains::MeshGraphSharedPtr	pGraph
	)

protected

Constructor.

Definition at line 71 of file DriverArpack.cpp.

    : DriverArnoldi(pSession, pGraph)
{
}

◆ ~DriverArpack()

Nektar::SolverUtils::DriverArpack::~DriverArpack ( )

overrideprotecteddefault

Destructor.

Member Function Documentation

◆ create()

static DriverSharedPtr Nektar::SolverUtils::DriverArpack::create	(	const LibUtilities::SessionReaderSharedPtr &	pSession,
		const SpatialDomains::MeshGraphSharedPtr &	pGraph
	)

inlinestatic

Creates an instance of this class.

Definition at line 52 of file DriverArpack.h.

    {
        DriverSharedPtr p =
            MemoryManager<DriverArpack>::AllocateSharedPtr(pSession, pGraph);
        p->InitObject();
        return p;
    }

References Nektar::MemoryManager< DataType >::AllocateSharedPtr(), and CellMLToNektar.cellml_metadata::p.

◆ v_Execute()

void Nektar::SolverUtils::DriverArpack::v_Execute ( std::ostream & out = std::cout )

overrideprotectedvirtual

Virtual function for solve implementation.

Reimplemented from Nektar::SolverUtils::DriverArnoldi.

Definition at line 121 of file DriverArpack.cpp.

{
    Array<OneD, NekDouble> tmpworkd;
 
    int nq = m_equ[0]
                 ->UpdateFields()[0]
                 ->GetNcoeffs(); // Number of points in the mesh
    int n      = m_nfields * nq; // Number of points in eigenvalue calculation
    int lworkl = 3 * m_kdim * (m_kdim + 2); // Size of work array
    int ido;  // REVERSE COMMUNICATION parameter. At the first call must be
              // initialised at 0
    int info; // do not set initial vector (info=0 random initial vector, info=1
              // read initial vector from session file)
 
    int iparam[11];
    int ipntr[14];
 
    Array<OneD, int> ritzSelect;
    Array<OneD, NekDouble> dr;
    Array<OneD, NekDouble> di;
    Array<OneD, NekDouble> workev;
    Array<OneD, NekDouble> z;
    NekDouble sigmar, sigmai;
 
    Array<OneD, NekDouble> resid(n);
    Array<OneD, NekDouble> v(n * m_kdim);
    Array<OneD, NekDouble> workl(lworkl, 0.0);
    Array<OneD, NekDouble> workd(3 * n, 0.0);
 
    ASSERTL0(n <= m_maxn, "N is greater than   MAXN");
 
    if (m_session->DefinesFunction("InitialConditions"))
    {
        out << "\tInital vector       : input file  " << endl;
        info = 1;
        CopyFieldToArnoldiArray(resid);
    }
    else
    {
        out << "\tInital vector       : random  " << endl;
        info = 0;
    }
 
    char B;
 
    iparam[0] = 1;      // strategy for shift-invert
    iparam[1] = 0;      // (deprecated)
    iparam[2] = m_nits; // maximum number of iterations allowed/taken
    iparam[3] = 1;      // blocksize to be used for recurrence
    iparam[4] = 0;      // number of converged ritz eigenvalues
    iparam[5] = 0;      // (deprecated)
 
    // Use generalized B matrix for coupled solver.
    if (m_timeSteppingAlgorithm)
    {
        iparam[6] = 1; // computation mode 1=> matrix-vector prod
        B         = 'I';
    }
    else
    {
        iparam[6] = 3; // computation mode 1=> matrix-vector prod
        B         = 'G';
    }
#if 0
    if((fabs(m_realShift) > NekConstants::kNekZeroTol)|| // use shift if m_realShift > 1e-12
       (fabs(m_imagShift) > NekConstants::kNekZeroTol))
    {
        iparam[6] = 3; // This was 3 need to know what to set it to
        B = 'G';
    }
    else
    {
        iparam[6] = 1;      // computation mode 1=> matrix-vector prod
        B = 'I';
    }
#endif
    iparam[7]  = 0; // (for shift-invert)
    iparam[8]  = 0; // number of MV operations
    iparam[9]  = 0; // number of BV operations
    iparam[10] = 0; // number of reorthogonalisation steps
 
    int cycle = 0;
    const char *problem =
        ArpackProblemTypeTrans[m_session->GetSolverInfoAsEnum<int>(
                                   "ArpackProblemType")]
            .c_str();
 
    std::string name = m_session->GetSessionName() + ".evl";
    ofstream pFile(name.c_str());
 
    ido = 0; // At the first call must be initialisedat 0
 
    while (ido != 99) // ido==-1 || ido==1 || ido==0)
    {
        // Routine for eigenvalue evaluation for non-symmetric operators
        Arpack::Dnaupd(ido, &B, // B='I' for std eval problem
                       n, problem, m_nvec, m_evtol, &resid[0], m_kdim, &v[0], n,
                       iparam, ipntr, &workd[0], &workl[0], lworkl, info);
 
        // Plotting of real and imaginary part of the
        // eigenvalues from workl
        out << "\rIteration " << cycle << ", output: " << info
            << ", ido=" << ido << " " << std::flush;
 
        if (!((cycle - 1) % m_kdim) && (cycle > m_kdim) && (ido != 2))
        {
            pFile << "Krylov spectrum at iteration: " << cycle << endl;
 
            if (m_timeSteppingAlgorithm)
            {
                pFile << "EV  Magnitude   Angle       Growth      Frequency   "
                         "Residual"
                      << endl;
            }
            else
            {
                pFile << "EV  Real        Imaginary   inverse real  inverse "
                         "imag  Residual"
                      << endl;
            }
 
            out << endl;
            for (int k = 0; k < m_kdim; ++k)
            {
                // write m_kdim eigs to screen
                WriteEvs(pFile, k, workl[ipntr[5] - 1 + k],
                         workl[ipntr[6] - 1 + k]);
            }
        }
 
        if (ido == 99)
        {
            break;
        }
 
        switch (ido)
        {
            case -1:
            case 1: // Note that ido=1 we are using input x
                    // (workd[inptr[0]-1]) rather than Mx as
                    // recommended in manual since it is not
                    // possible to impose forcing directly.
                CopyArnoldiArrayToField(tmpworkd = workd + (ipntr[0] - 1));
 
                m_equ[0]->TransCoeffToPhys();
 
                m_equ[0]->DoSolve();
                if (m_EvolutionOperator == eTransientGrowth)
                {
                    // start Adjoint with latest fields of direct
                    CopyFwdToAdj();
 
                    m_equ[1]->TransCoeffToPhys();
                    m_equ[1]->DoSolve();
                }
 
                if (!(cycle % m_infosteps))
                {
                    out << endl;
                    m_equ[0]->Output();
                }
 
                // operated fields are copied into workd[inptr[1]-1]
                CopyFieldToArnoldiArray(tmpworkd = workd + (ipntr[1] - 1));
 
                cycle++;
                break;
            case 2: // provide y = M x (bwd trans and iproduct);
            {
                // workd[inptr[0]-1] copied into operator fields
                CopyArnoldiArrayToField(tmpworkd = workd + (ipntr[0] - 1));
 
                m_equ[0]->TransCoeffToPhys();
 
                Array<OneD, MultiRegions::ExpListSharedPtr> fields =
                    m_equ[0]->UpdateFields();
                for (int i = 0; i < fields.size(); ++i)
                {
                    fields[i]->IProductWRTBase(fields[i]->GetPhys(),
                                               fields[i]->UpdateCoeffs());
                }
 
                // operated fields are copied into workd[inptr[1]-1]
                CopyFieldToArnoldiArray(tmpworkd = workd + (ipntr[1] - 1));
                break;
            }
            default:
                ASSERTL0(false, "Unexpected reverse communication request.");
        }
    }
 
    out << endl << "Converged in " << iparam[8] << " iterations" << endl;
 
    ASSERTL0(info >= 0, " Error with Dnaupd");
 
    ritzSelect = Array<OneD, int>(m_kdim, 0);
    dr         = Array<OneD, NekDouble>(m_nvec + 1, 0.0);
    di         = Array<OneD, NekDouble>(m_nvec + 1, 0.0);
    workev     = Array<OneD, NekDouble>(3 * m_kdim);
    z          = Array<OneD, NekDouble>(n * (m_nvec + 1));
 
    if (m_negatedOp)
    {
        sigmar = -m_realShift;
    }
    else
    {
        sigmar = m_realShift;
    }
 
    // Do not pass imaginary shift to Arpack since we have not
    // used a Fortran complex number format and so processing
    // is mucked up. Need to do some processing afterwards.
    sigmai = 0;
 
    // Setting 'A', Ritz vectors are computed. 'S' for Shur vectors
    Arpack::Dneupd(1, "A", ritzSelect.get(), dr.get(), di.get(), z.get(), n,
                   sigmar, sigmai, workev.get(), &B, n, problem, m_nvec,
                   m_evtol, resid.get(), m_kdim, v.get(), n, iparam, ipntr,
                   workd.get(), workl.get(), lworkl, info);
 
    ASSERTL0(info == 0, " Error with Dneupd");
 
    int nconv = iparam[4];
 
    // Subtract off complex shift if it exists
    if (m_negatedOp)
    {
        Vmath::Sadd(nconv, m_imagShift, di, 1, di, 1);
    }
    else
    {
        Vmath::Sadd(nconv, -m_imagShift, di, 1, di, 1);
    }
 
    WARNINGL0(m_imagShift == 0, "Complex Shift applied. "
                                "Need to implement Ritz re-evaluation of"
                                "eigenvalue. Only one half of complex "
                                "value will be correct");
 
    Array<OneD, MultiRegions::ExpListSharedPtr> fields =
        m_equ[0]->UpdateFields();
 
    out << "Converged Eigenvalues: " << nconv << endl;
    pFile << "Converged Eigenvalues: " << nconv << endl;
 
    if (m_timeSteppingAlgorithm)
    {
        out << "         Magnitude   Angle       Growth      Frequency" << endl;
        pFile << "         Magnitude   Angle       Growth      Frequency"
              << endl;
        for (int i = 0; i < nconv; ++i)
        {
            WriteEvs(out, i, dr[i], di[i]);
            WriteEvs(pFile, i, dr[i], di[i]);
 
            std::string file = m_session->GetSessionName() + "_eig_" +
                               std::to_string(i) + ".fld";
            WriteFld(file, z + i * n);
        }
    }
    else
    {
        out << "         Real        Imaginary " << endl;
        pFile << "         Real        Imaginary " << endl;
        for (int i = 0; i < nconv; ++i)
        {
            WriteEvs(out, i, dr[i], di[i], NekConstants::kNekUnsetDouble,
                     false);
            WriteEvs(pFile, i, dr[i], di[i], NekConstants::kNekUnsetDouble,
                     false);
 
            std::string file = m_session->GetSessionName() + "_eig_" +
                               std::to_string(i) + ".fld";
            WriteFld(file, z + i * n);
        }
    }
 
    m_real_evl = dr;
    m_imag_evl = di;
 
    pFile.close();
 
    for (int j = 0; j < m_equ[0]->GetNvariables(); ++j)
    {
        NekDouble vL2Error   = m_equ[0]->L2Error(j, false);
        NekDouble vLinfError = m_equ[0]->LinfError(j);
        if (m_comm->GetRank() == 0)
        {
            out << "L 2 error (variable " << m_equ[0]->GetVariable(j)
                << ") : " << vL2Error << endl;
            out << "L inf error (variable " << m_equ[0]->GetVariable(j)
                << ") : " << vLinfError << endl;
        }
    }
}

◆ v_InitObject()

void Nektar::SolverUtils::DriverArpack::v_InitObject ( std::ostream & out = std::cout )

overrideprotectedvirtual

Virtual function for initialisation implementation.

Reimplemented from Nektar::SolverUtils::DriverArnoldi.

Definition at line 80 of file DriverArpack.cpp.

{
    DriverArnoldi::v_InitObject(out);
 
    // Initialisation of Arnoldi parameters
    m_maxn   = 1000000; // Maximum size of the problem
    m_maxnev = 200;     // maximum number of eigenvalues requested
    m_maxncv = 500;     // Largest number of basis vector used in Implicitly
                        // Restarted Arnoldi
 
    // Error alerts
    ASSERTL0(m_nvec <= m_maxnev, "NEV is greater than MAXNEV");
    ASSERTL0(m_kdim <= m_maxncv, "NEV is greater than MAXNEV");
    ASSERTL0(2 <= m_kdim - m_nvec, "NCV-NEV is less than 2");
 
    ASSERTL0(m_comm->GetSize() == 1,
             "..ARPACK is not currently set-up for parallel execution...\n");
 
    m_equ[0]->PrintSummary(out);
 
    // Print session parameters
    out << "\tArnoldi solver type    : Arpack" << endl;
    out << "\tArpack problem type    : ";
    out << ArpackProblemTypeTrans[m_session->GetSolverInfoAsEnum<int>(
               "ArpackProblemType")]
        << endl;
    DriverArnoldi::ArnoldiSummary(out);
 
    // Initialization
    for (int i = 0; i < m_nequ; ++i)
    {
        m_equ[i]->DoInitialise();
    }
 
    // FwdTrans Initial conditions to be in Coefficient Space
    m_equ[m_nequ - 1]->TransPhysToCoeff();
}

References Nektar::SolverUtils::DriverArnoldi::ArnoldiSummary(), ArpackProblemTypeTrans, ASSERTL0, Nektar::SolverUtils::Driver::m_comm, Nektar::SolverUtils::Driver::m_equ, Nektar::SolverUtils::DriverArnoldi::m_kdim, m_maxn, m_maxncv, m_maxnev, Nektar::SolverUtils::Driver::m_nequ, Nektar::SolverUtils::DriverArnoldi::m_nvec, Nektar::SolverUtils::Driver::m_session, and Nektar::SolverUtils::DriverArnoldi::v_InitObject().

Friends And Related Function Documentation

◆ MemoryManager< DriverArpack >

friend class MemoryManager< DriverArpack >

friend

Definition at line 1 of file DriverArpack.h.

Member Data Documentation

◆ arpackProblemTypeDefault

std::string Nektar::SolverUtils::DriverArpack::arpackProblemTypeDefault

staticprivate

Initial value:

=
    LibUtilities::SessionReader::RegisterDefaultSolverInfo("ArpackProblemType",
                                                           "LargestMag")

Definition at line 88 of file DriverArpack.h.

◆ arpackProblemTypeLookupIds

std::string Nektar::SolverUtils::DriverArpack::arpackProblemTypeLookupIds

staticprivate

Initial value:

= {
    LibUtilities::SessionReader::RegisterEnumValue("ArpackProblemType",
                                                   "LargestReal", 0),
    LibUtilities::SessionReader::RegisterEnumValue("ArpackProblemType",
                                                   "SmallestReal", 1),
    LibUtilities::SessionReader::RegisterEnumValue("ArpackProblemType",
                                                   "LargestImag", 2),
    LibUtilities::SessionReader::RegisterEnumValue("ArpackProblemType",
                                                   "SmallestImag", 3),
    LibUtilities::SessionReader::RegisterEnumValue("ArpackProblemType",
                                                   "LargestMag", 4),
    LibUtilities::SessionReader::RegisterEnumValue("ArpackProblemType",
                                                   "SmallestMag", 5),
}

Definition at line 87 of file DriverArpack.h.

◆ ArpackProblemTypeTrans

std::string Nektar::SolverUtils::DriverArpack::ArpackProblemTypeTrans

staticprivate

Initial value:

= {"LR", "SR", "LI",

"SI", "LM", "SM"}

Definition at line 89 of file DriverArpack.h.

Referenced by v_Execute(), and v_InitObject().

◆ className

std::string Nektar::SolverUtils::DriverArpack::className

static

Initial value:

=

GetDriverFactory().RegisterCreatorFunction("Arpack", DriverArpack::create)

Nektar::LibUtilities::NekFactory::RegisterCreatorFunction

tKey RegisterCreatorFunction(tKey idKey, CreatorFunction classCreator, std::string pDesc="")

Register a class with the factory.

Definition: NekFactory.hpp:197

Nektar::SolverUtils::DriverArpack::create

static DriverSharedPtr create(const LibUtilities::SessionReaderSharedPtr &pSession, const SpatialDomains::MeshGraphSharedPtr &pGraph)

Creates an instance of this class.

Definition: DriverArpack.h:52

Nektar::SolverUtils::GetDriverFactory

DriverFactory & GetDriverFactory()

Definition: Driver.cpp:65

Name of the class.

Definition at line 63 of file DriverArpack.h.

◆ driverLookupId

std::string Nektar::SolverUtils::DriverArpack::driverLookupId

staticprotected

Initial value:

=

LibUtilities::SessionReader::RegisterEnumValue("Driver", "Arpack", 0)

Definition at line 84 of file DriverArpack.h.

◆ m_maxn

int Nektar::SolverUtils::DriverArpack::m_maxn

protected

Definition at line 66 of file DriverArpack.h.

Referenced by v_Execute(), and v_InitObject().

◆ m_maxncv

int Nektar::SolverUtils::DriverArpack::m_maxncv

protected

Definition at line 68 of file DriverArpack.h.

Referenced by v_InitObject().

◆ m_maxnev

int Nektar::SolverUtils::DriverArpack::m_maxnev

protected

Definition at line 67 of file DriverArpack.h.

Referenced by v_InitObject().

Static Public Member Functions

Static Public Attributes

Protected Member Functions

Protected Attributes

Static Protected Attributes

Static Private Attributes

Friends

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ DriverArpack()

◆ ~DriverArpack()

Member Function Documentation

◆ create()

◆ v_Execute()

◆ v_InitObject()

Friends And Related Function Documentation

◆ MemoryManager< DriverArpack >

Member Data Documentation

◆ arpackProblemTypeDefault

◆ arpackProblemTypeLookupIds

◆ ArpackProblemTypeTrans

◆ className

◆ driverLookupId

◆ m_maxn

◆ m_maxncv

◆ m_maxnev