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 = GetDriverFactory().RegisterCreatorFunction("Arpack", DriverArpack::create)
	Name of the class. More...

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

virtual	~DriverArpack ()
	Destructor. More...

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

virtual void	v_Execute (std::ostream &out=std::cout)
	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...

virtual	~DriverArnoldi ()
	Destructor. 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)

virtual Array< OneD, NekDouble >	v_GetRealEvl (void)

virtual Array< OneD, NekDouble >	v_GetImagEvl (void)

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

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
	I the 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	arpackProblemTypeLookupIds []

static std::string	arpackProblemTypeDefault = LibUtilities::SessionReader::RegisterDefaultSolverInfo("ArpackProblemType","LargestMag")

static std::string	driverLookupId = LibUtilities::SessionReader::RegisterEnumValue("Driver","Arpack",0)

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	ArpackProblemTypeTrans []

Friends
class	MemoryManager< DriverArpack >

Additional Inherited Members
Public Member Functions inherited from Nektar::SolverUtils::DriverArnoldi
SOLVER_UTILS_EXPORT void	ArnoldiSummary (std::ostream &out)

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 ()

SOLVER_UTILS_EXPORT Array< OneD, NekDouble >	GetRealEvl (void)

SOLVER_UTILS_EXPORT Array< OneD, NekDouble >	GetImagEvl (void)

Detailed Description

Base class for the development of solvers.

Definition at line 48 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 64 of file DriverArpack.cpp.

     : DriverArnoldi(pSession, pGraph)
 {
 }

◆ ~DriverArpack()

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

protectedvirtual

Destructor.

Definition at line 74 of file DriverArpack.cpp.

75 {

76 }

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 54 of file DriverArpack.h.

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

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

◆ v_Execute()

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

protectedvirtual

Virtual function for solve implementation.

Implements Nektar::SolverUtils::Driver.

Definition at line 118 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.num_elements(); ++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_"
                 + boost::lexical_cast<std::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_"
                 + boost::lexical_cast<std::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 )

protectedvirtual

Virtual function for initialisation implementation.

Reimplemented from Nektar::SolverUtils::DriverArnoldi.

Definition at line 81 of file DriverArpack.cpp.

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().

 {
     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");
 
     m_equ[0]->PrintSummary(out);
 
     ASSERTL0(m_comm->GetSize() == 1,
              "ARPACK Arnoldi solver does not support execution in parallel.");
 
     // Print session parameters
     out << "\tArnoldi solver type    : Arpack" << endl;
 
     out << "\tArpack problem type    : ";
     out << ArpackProblemTypeTrans[m_session->GetSolverInfoAsEnum<int>("ArpackProblemType")] << endl;
     DriverArnoldi::ArnoldiSummary(out);
 
     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();
 
 }

Friends And Related Function Documentation

◆ MemoryManager< DriverArpack >

friend class MemoryManager< DriverArpack >

friend

Definition at line 51 of file DriverArpack.h.

Member Data Documentation

◆ arpackProblemTypeDefault

std::string Nektar::SolverUtils::DriverArpack::arpackProblemTypeDefault = LibUtilities::SessionReader::RegisterDefaultSolverInfo("ArpackProblemType","LargestMag")

staticprotected

Definition at line 88 of file DriverArpack.h.

◆ arpackProblemTypeLookupIds

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

staticprotected

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 92 of file DriverArpack.h.

Referenced by v_Execute(), and v_InitObject().

◆ className

std::string Nektar::SolverUtils::DriverArpack::className = GetDriverFactory().RegisterCreatorFunction("Arpack", DriverArpack::create)

static

Name of the class.

Definition at line 65 of file DriverArpack.h.

◆ driverLookupId

std::string Nektar::SolverUtils::DriverArpack::driverLookupId = LibUtilities::SessionReader::RegisterEnumValue("Driver","Arpack",0)

staticprotected

Definition at line 89 of file DriverArpack.h.

◆ m_maxn

int Nektar::SolverUtils::DriverArpack::m_maxn

protected

Definition at line 70 of file DriverArpack.h.

Referenced by v_Execute(), and v_InitObject().

◆ m_maxncv

int Nektar::SolverUtils::DriverArpack::m_maxncv

protected

Definition at line 72 of file DriverArpack.h.

Referenced by v_InitObject().

◆ m_maxnev

int Nektar::SolverUtils::DriverArpack::m_maxnev

protected

Definition at line 71 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