#include <DriverModifiedArnoldi.h>

Inheritance diagram for Nektar::SolverUtils::DriverModifiedArnoldi:

Collaboration diagram for Nektar::SolverUtils::DriverModifiedArnoldi:

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

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

Protected Member Functions
	DriverModifiedArnoldi (const LibUtilities::SessionReaderSharedPtr pSession)
	Constructor. More...

virtual	~DriverModifiedArnoldi ()
	Destructor. More...

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

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

Protected Member Functions inherited from Nektar::SolverUtils::DriverArnoldi
	DriverArnoldi (const LibUtilities::SessionReaderSharedPtr pSession)
	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)

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

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

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)
	Initialises EquationSystem class members. More...

Private Member Functions
void	EV_update (Array< OneD, NekDouble > &src, Array< OneD, NekDouble > &tgt)
	Generates a new vector in the sequence by applying the linear operator. More...

void	EV_small (Array< OneD, Array< OneD, NekDouble > > &Kseq, const int ntot, const Array< OneD, NekDouble > &alpha, const int kdim, Array< OneD, NekDouble > &zvec, Array< OneD, NekDouble > &wr, Array< OneD, NekDouble > &wi, NekDouble &resnorm)
	Generates the upper Hessenberg matrix H and computes its eigenvalues. More...

int	EV_test (const int itrn, const int kdim, Array< OneD, NekDouble > &zvec, Array< OneD, NekDouble > &wr, Array< OneD, NekDouble > &wi, const NekDouble resnorm, const int nvec, ofstream &evlout, NekDouble &resid0)
	Tests for convergence of eigenvalues of H. More...

void	EV_sort (Array< OneD, NekDouble > &evec, Array< OneD, NekDouble > &wr, Array< OneD, NekDouble > &wi, Array< OneD, NekDouble > &test, const int dim)
	Sorts a sequence of eigenvectors/eigenvalues by magnitude. More...

void	EV_post (Array< OneD, Array< OneD, NekDouble > > &Tseq, Array< OneD, Array< OneD, NekDouble > > &Kseq, const int ntot, const int kdim, const int nvec, Array< OneD, NekDouble > &zvec, Array< OneD, NekDouble > &wr, Array< OneD, NekDouble > &wi, const int icon)

void	EV_big (Array< OneD, Array< OneD, NekDouble > > &bvecs, Array< OneD, Array< OneD, NekDouble > > &evecs, const int ntot, const int kdim, const int nvec, Array< OneD, NekDouble > &zvec, Array< OneD, NekDouble > &wr, Array< OneD, NekDouble > &wi)

Static Private Attributes
static std::string	driverLookupId

Friends
class	MemoryManager< DriverModifiedArnoldi >

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 (ostream &out=cout)
	Initialise Object. More...

SOLVER_UTILS_EXPORT void	Execute (ostream &out=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)

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

Array< OneD, NekDouble >	m_real_evl

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...

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

static std::string	evolutionOperatorDef

static std::string	driverDefault

Detailed Description

Definition at line 47 of file DriverModifiedArnoldi.h.

Constructor & Destructor Documentation

Nektar::SolverUtils::DriverModifiedArnoldi::DriverModifiedArnoldi ( const LibUtilities::SessionReaderSharedPtr pSession )

protected

Constructor.

Definition at line 56 of file DriverModifiedArnoldi.cpp.

     : DriverArnoldi(pSession)
     {
     }

Nektar::SolverUtils::DriverModifiedArnoldi::~DriverModifiedArnoldi ( )

protectedvirtual

Destructor.

Definition at line 66 of file DriverModifiedArnoldi.cpp.

67 {

68 }

Member Function Documentation

static DriverSharedPtr Nektar::SolverUtils::DriverModifiedArnoldi::create ( const LibUtilities::SessionReaderSharedPtr & pSession )

inlinestatic

Creates an instance of this class.

Definition at line 53 of file DriverModifiedArnoldi.h.

References Nektar::MemoryManager< DataType >::AllocateSharedPtr().

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

void Nektar::SolverUtils::DriverModifiedArnoldi::EV_big	(	Array< OneD, Array< OneD, NekDouble > > &	bvecs,
		Array< OneD, Array< OneD, NekDouble > > &	evecs,
		const int	ntot,
		const int	kdim,
		const int	nvec,
		Array< OneD, NekDouble > &	zvec,
		Array< OneD, NekDouble > &	wr,
		Array< OneD, NekDouble > &	wi
	)

private

Definition at line 527 of file DriverModifiedArnoldi.cpp.

References Vmath::Ddot(), Nektar::SolverUtils::Driver::m_comm, Nektar::LibUtilities::ReduceSum, Vmath::Smul(), Vmath::Svtvp(), and Vmath::Zero().

Referenced by EV_post().

     {
         NekDouble wgt, norm;
         
         // Generate big eigenvectors
         for (int j = 0; j < nvec; ++j)
         {
         Vmath::Zero(ntot, evecs[j], 1);
         for (int i = 0; i < kdim; ++i)
         {
             wgt = zvec[i + j*kdim];
             Vmath::Svtvp(ntot, wgt, bvecs[i], 1, evecs[j], 1, evecs[j], 1);
         }
         }
         
         // Normalise the big eigenvectors
         for (int i = 0; i < nvec; ++i)
         {
         if (wi[i] == 0.0)   // Real mode
         {
             norm = Blas::Ddot(ntot, &evecs[i][0], 1, &evecs[i][0], 1);
             m_comm->AllReduce(norm, Nektar::LibUtilities::ReduceSum);
             norm = std::sqrt(norm);
             Vmath::Smul(ntot, 1.0/norm, evecs[i], 1, evecs[i], 1);
         }
         else
         {
             norm  = Blas::Ddot(ntot, &evecs[i][0],   1, &evecs[i][0],   1);
             norm += Blas::Ddot(ntot, &evecs[i+1][0], 1, &evecs[i+1][0], 1);
             m_comm->AllReduce(norm, Nektar::LibUtilities::ReduceSum);
             norm = std::sqrt(norm);
             
             Vmath::Smul(ntot, 1.0/norm, evecs[i],   1, evecs[i],   1);
             Vmath::Smul(ntot, 1.0/norm, evecs[i+1], 1, evecs[i+1], 1);
             
             i++;
         }
         }
     }

void Nektar::SolverUtils::DriverModifiedArnoldi::EV_post	(	Array< OneD, Array< OneD, NekDouble > > &	Tseq,
		Array< OneD, Array< OneD, NekDouble > > &	Kseq,
		const int	ntot,
		const int	kdim,
		const int	nvec,
		Array< OneD, NekDouble > &	zvec,
		Array< OneD, NekDouble > &	wr,
		Array< OneD, NekDouble > &	wi,
		const int	icon
	)

private

Definition at line 479 of file DriverModifiedArnoldi.cpp.

References ASSERTL0, EV_big(), Nektar::SolverUtils::Driver::m_equ, Nektar::SolverUtils::Driver::m_session, and Nektar::SolverUtils::DriverArnoldi::WriteFld().

Referenced by v_Execute().

     {
         if (icon == 0)
         {
         // Not converged, write final Krylov vector
         ASSERTL0(false, "Convergence was not achieved within the "
         "prescribed number of iterations.");
         }
         else if (icon < 0)
         {
         // Minimum residual reached
         ASSERTL0(false, "Minimum residual reached.");
         }
         else if (icon == nvec)
         {
         // Converged, write out eigenvectors
         EV_big(Tseq, Kseq, ntot, kdim, icon, zvec, wr, wi);
         Array<OneD, MultiRegions::ExpListSharedPtr> fields
         = m_equ[0]->UpdateFields();
         
         for (int j = 0; j < icon; ++j)
         {
             std::string file = m_session->GetSessionName() + "_eig_"
             + boost::lexical_cast<std::string>(j);
             
             WriteFld(file,Kseq[j]);
         }
         }
         else
         {
         // Not recognised
         ASSERTL0(false, "Unrecognised value.");
         }
     }

void Nektar::SolverUtils::DriverModifiedArnoldi::EV_small	(	Array< OneD, Array< OneD, NekDouble > > &	Kseq,
		const int	ntot,
		const Array< OneD, NekDouble > &	alpha,
		const int	kdim,
		Array< OneD, NekDouble > &	zvec,
		Array< OneD, NekDouble > &	wr,
		Array< OneD, NekDouble > &	wi,
		NekDouble &	resnorm
	)

private

Generates the upper Hessenberg matrix H and computes its eigenvalues.

Definition at line 317 of file DriverModifiedArnoldi.cpp.

References ASSERTL0, Vmath::Ddot(), Vmath::Dot(), Nektar::SolverUtils::Driver::m_comm, Nektar::LibUtilities::ReduceSum, Vmath::Smul(), and Vmath::Svtvp().

Referenced by v_Execute().

     {
         int kdimp = kdim + 1;
         int lwork = 10*kdim;
         int ier;
         Array<OneD, NekDouble> R(kdimp * kdimp, 0.0);
         Array<OneD, NekDouble> H(kdimp * kdim, 0.0);
         Array<OneD, NekDouble> rwork(lwork, 0.0);
         
         // Modified G-S orthonormalisation
         for (int i = 0; i < kdimp; ++i)
         {
         NekDouble gsc = Blas::Ddot(ntot, &Kseq[i][0], 1, &Kseq[i][0], 1);
         m_comm->AllReduce(gsc, Nektar::LibUtilities::ReduceSum);
         gsc = std::sqrt(gsc);
         ASSERTL0(gsc != 0.0, "Vectors are linearly independent.");
         
         R[i*kdimp+i] = gsc;
         Vmath::Smul(ntot, 1.0/gsc, Kseq[i], 1, Kseq[i], 1);
         
         for (int j = i + 1; j < kdimp; ++j)
         {
             gsc = Blas::Ddot(ntot, &Kseq[i][0], 1, &Kseq[j][0], 1);
             m_comm->AllReduce(gsc, Nektar::LibUtilities::ReduceSum);
             Vmath::Svtvp(ntot, -gsc, Kseq[i], 1, Kseq[j], 1, Kseq[j], 1);
             R[j*kdimp+i] = gsc;
         }
         }
         
         // Compute H matrix
         for (int i = 0; i < kdim; ++i)
         {
         for (int j = 0; j < kdim; ++j)
         {
             H[j*kdim+i] = alpha[j+1] * R[(j+1)*kdimp+i]
             - Vmath::Dot(j, &H[0] + i, kdim, &R[0] + j*kdimp, 1);
             H[j*kdim+i] /= R[j*kdimp+j];
         }
         }
         
         H[(kdim-1)*kdim+kdim] = alpha[kdim]
         * std::fabs(R[kdim*kdimp+kdim] / R[(kdim-1)*kdimp + kdim-1]);
         
         Lapack::dgeev_('N', 'V', kdim, &H[0], kdim, &wr[0], &wi[0], 0, 1,
                &zvec[0], kdim, &rwork[0], lwork, ier);
         
         ASSERTL0(!ier, "Error with dgeev");
         
         resnorm = H[(kdim-1)*kdim + kdim];
     }

void Nektar::SolverUtils::DriverModifiedArnoldi::EV_sort	(	Array< OneD, NekDouble > &	evec,
		Array< OneD, NekDouble > &	wr,
		Array< OneD, NekDouble > &	wi,
		Array< OneD, NekDouble > &	test,
		const int	dim
	)

private

Sorts a sequence of eigenvectors/eigenvalues by magnitude.

Definition at line 444 of file DriverModifiedArnoldi.cpp.

References Vmath::Vcopy().

Referenced by EV_test().

     {
         Array<OneD, NekDouble> z_tmp(dim,0.0);
         NekDouble wr_tmp, wi_tmp, te_tmp;
         for (int j = 1; j < dim; ++j)
         {
         wr_tmp = wr[j];
         wi_tmp = wi[j];
         te_tmp = test[j];
         Vmath::Vcopy(dim, &evec[0] + j*dim, 1, &z_tmp[0], 1);
         int i = j - 1;
         while (i >= 0 && test[i] > te_tmp)
         {
             wr[i+1] = wr[i];
             wi[i+1] = wi[i];
             test[i+1] = test[i];
             Vmath::Vcopy(dim, &evec[0] + i*dim, 1, &evec[0] + (i+1)*dim, 1);
             i--;
         }
         wr[i+1] = wr_tmp;
         wi[i+1] = wi_tmp;
         test[i+1] = te_tmp;
         Vmath::Vcopy(dim, &z_tmp[0], 1, &evec[0] + (i+1)*dim, 1);
         }
     }

int Nektar::SolverUtils::DriverModifiedArnoldi::EV_test	(	const int	itrn,
		const int	kdim,
		Array< OneD, NekDouble > &	zvec,
		Array< OneD, NekDouble > &	wr,
		Array< OneD, NekDouble > &	wi,
		const NekDouble	resnorm,
		const int	nvec,
		ofstream &	evlout,
		NekDouble &	resid0
	)

private

Tests for convergence of eigenvalues of H.

Definition at line 380 of file DriverModifiedArnoldi.cpp.

References Vmath::Dot(), EV_sort(), Nektar::SolverUtils::Driver::m_comm, Nektar::SolverUtils::DriverArnoldi::m_evtol, Nektar::SolverUtils::DriverArnoldi::m_timeSteppingAlgorithm, and Nektar::SolverUtils::DriverArnoldi::WriteEvs().

Referenced by v_Execute().

     {
         int idone = 0;
         // NekDouble period = 0.1;
         
         Array<OneD, NekDouble> resid(kdim);
         for (int i = 0; i < kdim; ++i)
         {
         NekDouble tmp = std::sqrt(Vmath::Dot(kdim, &zvec[0] + i*kdim, 1,
                              &zvec[0] + i*kdim, 1));
         resid[i] = resnorm * std::fabs(zvec[kdim - 1 + i*kdim]) / tmp;
         if (wi[i] < 0.0)
         {
             resid[i-1] = resid[i] = hypot(resid[i-1], resid[i]);
         }
         }
         
         EV_sort(zvec, wr, wi, resid, kdim);
         
         if (resid[nvec-1] < m_evtol)
         {
         idone = nvec;
         }
         
         if (m_comm->GetRank() == 0)
         {
         evlout << "-- Iteration = " << itrn << ", H(k+1, k) = "
         << resnorm << endl;
         evlout.precision(4);
         evlout.setf(ios::scientific, ios::floatfield);
         if(m_timeSteppingAlgorithm)
         {
             evlout << "EV  Magnitude   Angle       Growth      "
             << "Frequency   Residual" << endl;
         }
         else
         {
             evlout << "EV  Real        Imaginary   inverse real  "
             << "inverse imag  Residual" << endl;
         }
         
         for (int i = 0; i < kdim; i++)
         {
             WriteEvs(evlout,i,wr[i],wi[i],resid[i]);
         }
         }
         
         resid0 = resid[nvec-1];
         return idone;
     }

void Nektar::SolverUtils::DriverModifiedArnoldi::EV_update	(	Array< OneD, NekDouble > &	src,
		Array< OneD, NekDouble > &	tgt
	)

private

Generates a new vector in the sequence by applying the linear operator.

Definition at line 287 of file DriverModifiedArnoldi.cpp.

References Nektar::SolverUtils::DriverArnoldi::CopyArnoldiArrayToField(), Nektar::SolverUtils::DriverArnoldi::CopyFieldToArnoldiArray(), Nektar::SolverUtils::DriverArnoldi::CopyFwdToAdj(), Nektar::SolverUtils::eTransientGrowth, Nektar::SolverUtils::Driver::m_equ, and Nektar::SolverUtils::Driver::m_EvolutionOperator.

Referenced by v_Execute().

     {
         // Copy starting vector into first sequence element.
         CopyArnoldiArrayToField(src);
         m_equ[0]->TransCoeffToPhys();
         
         m_equ[0]->DoSolve();
         
         if(m_EvolutionOperator == eTransientGrowth)
         {
         Array<OneD, MultiRegions::ExpListSharedPtr> fields;
         fields = m_equ[0]->UpdateFields();
         
         //start Adjoint with latest fields of direct
         CopyFwdToAdj();
         m_equ[1]->TransCoeffToPhys();
         
         m_equ[1]->DoSolve();
         }
         
         // Copy starting vector into first sequence element.
         CopyFieldToArnoldiArray(tgt);
     }

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

protectedvirtual

Virtual function for solve implementation.

Implements Nektar::SolverUtils::Driver.

Reimplemented in Nektar::SolverUtils::DriverSteadyState.

Definition at line 99 of file DriverModifiedArnoldi.cpp.

Referenced by Nektar::SolverUtils::DriverSteadyState::v_Execute().

     {
         int i               = 0;
         int j               = 0;
         int nq              = m_equ[0]->UpdateFields()[0]->GetNcoeffs();
         int ntot            = m_nfields*nq;
         int converged       = 0;
         NekDouble resnorm   = 0.0;
         ofstream evlout;
         std::string evlFile = m_session->GetSessionName() + ".evl";
         
         if (m_comm->GetRank() == 0)
         {
         evlout.open(evlFile.c_str());
         }
         
         // Allocate memory
         Array<OneD, NekDouble> alpha = Array<OneD, NekDouble> (m_kdim+1,      0.0);
         Array<OneD, NekDouble> wr    = Array<OneD, NekDouble> (m_kdim,        0.0);
         Array<OneD, NekDouble> wi    = Array<OneD, NekDouble> (m_kdim,        0.0);
         Array<OneD, NekDouble> zvec  = Array<OneD, NekDouble> (m_kdim*m_kdim, 0.0);
         
         Array<OneD, Array<OneD, NekDouble> > Kseq
         = Array<OneD, Array<OneD, NekDouble> > (m_kdim + 1);
         Array<OneD, Array<OneD, NekDouble> > Tseq
         = Array<OneD, Array<OneD, NekDouble> > (m_kdim + 1);
         for (i = 0; i < m_kdim + 1; ++i)
         {
         Kseq[i] = Array<OneD, NekDouble>(ntot, 0.0);
         Tseq[i] = Array<OneD, NekDouble>(ntot, 0.0);
         }
         
         // Copy starting vector into second sequence element (temporary).
         if(m_session->DefinesFunction("InitialConditions"))
         {
         if (m_comm->GetRank() == 0)
         {
             out << "\tInital vector       : specified in input file " << endl;
         }
         m_equ[0]->SetInitialConditions(0.0,false);
         
         CopyFieldToArnoldiArray(Kseq[1]);
         }
         else
         {
         if (m_comm->GetRank() == 0)
         {
             out << "\tInital vector       : random  " << endl;
         }
         
         NekDouble eps=1;
         Vmath::FillWhiteNoise(ntot, eps , &Kseq[1][0], 1);
         }
         
         // Perform one iteration to enforce boundary conditions.
         // Set this as the initial value in the sequence.
         EV_update(Kseq[1], Kseq[0]);
         if (m_comm->GetRank() == 0)
         {
         out << "Iteration: " << 0 <<  endl;
         }
         
         // Normalise first vector in sequence
         alpha[0] = Blas::Ddot(ntot, &Kseq[0][0], 1, &Kseq[0][0], 1);
         m_comm->AllReduce(alpha[0], Nektar::LibUtilities::ReduceSum);
         alpha[0] = std::sqrt(alpha[0]);
         Vmath::Smul(ntot, 1.0/alpha[0], Kseq[0], 1, Kseq[0], 1);
         
         // Fill initial krylov sequence
         NekDouble resid0;
         for (i = 1; !converged && i <= m_kdim; ++i)
         {
         // Compute next vector
         EV_update(Kseq[i-1], Kseq[i]);
         
         // Normalise
         alpha[i] = Blas::Ddot(ntot, &Kseq[i][0], 1, &Kseq[i][0], 1);
         m_comm->AllReduce(alpha[i], Nektar::LibUtilities::ReduceSum);
         alpha[i] = std::sqrt(alpha[i]);
         
         //alpha[i] = std::sqrt(alpha[i]);
         Vmath::Smul(ntot, 1.0/alpha[i], Kseq[i], 1, Kseq[i], 1);
         
         // Copy Krylov sequence into temporary storage
         for (int k = 0; k < i + 1; ++k)
         {
             Vmath::Vcopy(ntot, Kseq[k], 1, Tseq[k], 1);
         }
         
         // Generate Hessenberg matrix and compute eigenvalues of it.
         EV_small(Tseq, ntot, alpha, i, zvec, wr, wi, resnorm);
         
         // Test for convergence.
         converged = EV_test(i, i, zvec, wr, wi, resnorm,
                     std::min(i, m_nvec), evlout, resid0);
         converged = max (converged, 0);
         
         if (m_comm->GetRank() == 0)
         {
             out << "Iteration: " <<  i << " (residual : " << resid0
             << ")" <<endl;
         }
         }
         
         // Continue with full sequence
         if (!converged)
         {
         for (i = m_kdim + 1; !converged && i <= m_nits; ++i)
         {
             // Shift all the vectors in the sequence.
             // First vector is removed.
             for (int j = 1; j <= m_kdim; ++j)
             {
             alpha[j-1] = alpha[j];
             Vmath::Vcopy(ntot, Kseq[j], 1, Kseq[j-1], 1);
             }
             
             // Compute next vector
             EV_update(Kseq[m_kdim - 1], Kseq[m_kdim]);
             
             // Compute new scale factor
             alpha[m_kdim] = Blas::Ddot(ntot, &Kseq[m_kdim][0], 1,
                            &Kseq[m_kdim][0], 1);
             m_comm->AllReduce(alpha[m_kdim],
                       Nektar::LibUtilities::ReduceSum);
             alpha[m_kdim] = std::sqrt(alpha[m_kdim]);
             Vmath::Smul(ntot, 1.0/alpha[m_kdim], Kseq[m_kdim], 1,
                 Kseq[m_kdim], 1);
             
             // Copy Krylov sequence into temporary storage
             for (int k = 0; k < m_kdim + 1; ++k)
             {
             Vmath::Vcopy(ntot, Kseq[k], 1, Tseq[k], 1);
             }
             
             // Generate Hessenberg matrix and compute eigenvalues of it
             EV_small(Tseq, ntot, alpha, m_kdim, zvec, wr, wi, resnorm);
             
             // Test for convergence.
             converged = EV_test(i, m_kdim, zvec, wr, wi, resnorm,
                     m_nvec, evlout, resid0);
             
             if (m_comm->GetRank() == 0)
             {
             out << "Iteration: " <<  i << " (residual : "
             << resid0 << ")" <<endl;
             }
         }
         }
         
         m_equ[0]->Output();
         
         // Evaluate and output computation time and solution accuracy.
         // The specific format of the error output is essential for the
         // regression tests to work.
         // Evaluate L2 Error
         for(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;
         }
         }
         
         // Process eigenvectors and write out.
         EV_post(Tseq, Kseq, ntot, min(--i, m_kdim), m_nvec, zvec, wr, wi,
             converged);
         
         // store eigenvalues so they can be access from driver class
         m_real_evl = wr;
         m_imag_evl = wi;
         
         // Close the runtime info file.
         if (m_comm->GetRank() == 0)
         {
         evlout.close();
         }
     }

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

protectedvirtual

Virtual function for initialisation implementation.

Reimplemented from Nektar::SolverUtils::DriverArnoldi.

Reimplemented in Nektar::SolverUtils::DriverSteadyState.

Definition at line 74 of file DriverModifiedArnoldi.cpp.

References Nektar::SolverUtils::DriverArnoldi::ArnoldiSummary(), Nektar::SolverUtils::Driver::m_comm, Nektar::SolverUtils::Driver::m_equ, Nektar::SolverUtils::Driver::m_nequ, and Nektar::SolverUtils::DriverArnoldi::v_InitObject().

Referenced by Nektar::SolverUtils::DriverSteadyState::v_InitObject().

     {
         DriverArnoldi::v_InitObject(out);
         
         m_equ[0]->PrintSummary(out);
         
         // Print session parameters
         if (m_comm->GetRank() == 0)
         {
         out << "\tArnoldi solver type    : Modified Arnoldi" << endl;
         }
         
         DriverArnoldi::ArnoldiSummary(out);
         
         m_equ[m_nequ - 1]->DoInitialise();
         
         //FwdTrans Initial conditions to be in Coefficient Space
         m_equ[m_nequ-1] ->TransPhysToCoeff();
         
     }

Friends And Related Function Documentation

friend class MemoryManager< DriverModifiedArnoldi >

friend

Definition at line 50 of file DriverModifiedArnoldi.h.

Member Data Documentation

string Nektar::SolverUtils::DriverModifiedArnoldi::className

static

Initial value:

=
    GetDriverFactory().RegisterCreatorFunction("ModifiedArnoldi",
                           DriverModifiedArnoldi::create)

Name of the class.

Definition at line 63 of file DriverModifiedArnoldi.h.

string Nektar::SolverUtils::DriverModifiedArnoldi::driverLookupId

staticprivate

Initial value:

=
    LibUtilities::SessionReader::RegisterEnumValue("Driver",
                               "ModifiedArnoldi",0)

Definition at line 132 of file DriverModifiedArnoldi.h.

Static Public Member Functions

Static Public Attributes

Protected Member Functions

Private Member Functions

Static Private Attributes

Friends

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Friends And Related Function Documentation

Member Data Documentation