Nektar::LinearisedAdvection Class Reference

#include <LinearisedAdvection.h>

Inheritance diagram for Nektar::LinearisedAdvection:

Collaboration diagram for Nektar::LinearisedAdvection:

Static Public Member Functions
static SolverUtils::AdvectionSharedPtr	create (std::string)
	Creates an instance of this class. More...

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

Protected Member Functions
DNekBlkMatSharedPtr	GetFloquetBlockMatrix (FloquetMatType mattype, bool UseContCoeffs=false) const
DNekBlkMatSharedPtr	GenFloquetBlockMatrix (FloquetMatType mattype, bool UseContCoeffs=false) const
	LinearisedAdvection ()
virtual	~LinearisedAdvection ()
virtual void	v_InitObject (LibUtilities::SessionReaderSharedPtr pSession, Array< OneD, MultiRegions::ExpListSharedPtr > pFields)
	Initialises the advection object. More...
virtual void	v_Advect (const int nConvectiveFields, const Array< OneD, MultiRegions::ExpListSharedPtr > &fields, const Array< OneD, Array< OneD, NekDouble > > &advVel, const Array< OneD, Array< OneD, NekDouble > > &inarray, Array< OneD, Array< OneD, NekDouble > > &outarray, const NekDouble &time, const Array< OneD, Array< OneD, NekDouble > > &pFwd=NullNekDoubleArrayofArray, const Array< OneD, Array< OneD, NekDouble > > &pBwd=NullNekDoubleArrayofArray)
	Advects a vector field. More...
virtual void	v_SetBaseFlow (const Array< OneD, Array< OneD, NekDouble > > &inarray, const Array< OneD, MultiRegions::ExpListSharedPtr > &fields)
	Overrides the base flow used during linearised advection. More...
void	UpdateBase (const NekDouble m_slices, const Array< OneD, const NekDouble > &inarray, Array< OneD, NekDouble > &outarray, const NekDouble m_time, const NekDouble m_period)
void	UpdateGradBase (const int var, const MultiRegions::ExpListSharedPtr &field)
void	DFT (const std::string file, Array< OneD, MultiRegions::ExpListSharedPtr > &pFields, const NekDouble m_slices)
void	ImportFldBase (std::string pInfile, Array< OneD, MultiRegions::ExpListSharedPtr > &pFields, int slice)
	Import Base flow. More...

Protected Attributes
LibUtilities::SessionReaderSharedPtr	m_session
int	m_spacedim
int	m_expdim
Array< OneD, Array< OneD, NekDouble > >	m_baseflow
	Storage for base flow. More...
Array< OneD, Array< OneD, NekDouble > >	m_gradBase
int	m_slices
	number of slices More...
NekDouble	m_period
	period length More...
Array< OneD, Array< OneD, NekDouble > >	m_interp
	interpolation vector More...
LibUtilities::NektarFFTSharedPtr	m_FFT
	auxiliary variables More...
Array< OneD, NekDouble >	m_tmpIN
Array< OneD, NekDouble >	m_tmpOUT
bool	m_useFFTW
bool	m_singleMode
	flag to determine if use single mode or not More...
bool	m_halfMode
	flag to determine if use half mode or not More...
bool	m_multipleModes
	flag to determine if use multiple mode or not More...
FloquetBlockMatrixMapShPtr	m_FloquetBlockMat
Protected Attributes inherited from Nektar::SolverUtils::Advection
AdvectionFluxVecCB	m_fluxVector
	Callback function to the flux vector (set when advection is in conservative form). More...
RiemannSolverSharedPtr	m_riemann
	Riemann solver for DG-type schemes. More...
int	m_spaceDim
	Storage for space dimension. Used for homogeneous extension. More...

Private Types
enum	FloquetMatType { eForwardsCoeff, eForwardsPhys }
enum	HomogeneousType { eHomogeneous1D, eHomogeneous2D, eHomogeneous3D, eNotHomogeneous }
	Parameter for homogeneous expansions. More...
typedef std::map < FloquetMatType, DNekBlkMatSharedPtr >	FloquetBlockMatrixMap
	A map between matrix keys and their associated block matrices. More...
typedef boost::shared_ptr < FloquetBlockMatrixMap >	FloquetBlockMatrixMapShPtr
	A shared pointer to a BlockMatrixMap. More...

Private Attributes
bool	m_useFFT
	flag to determine if use or not the FFT for transformations More...
enum HomogeneousType	m_HomogeneousType
NekDouble	m_LhomX
	physical length in X direction (if homogeneous) More...
NekDouble	m_LhomY
	physical length in Y direction (if homogeneous) More...
NekDouble	m_LhomZ
	physical length in Z direction (if homogeneous) More...
int	m_npointsX
	number of points in X direction (if homogeneous) More...
int	m_npointsY
	number of points in Y direction (if homogeneous) More...
int	m_npointsZ
	number of points in Z direction (if homogeneous) More...
int	m_HomoDirec
	number of homogenous directions More...
int	m_NumMode
	Mode to use in case of single mode analysis. More...
SpatialDomains::BoundaryConditionsSharedPtr	m_boundaryConditions

Friends
class	MemoryManager< LinearisedAdvection >

Additional Inherited Members
Public Member Functions inherited from Nektar::SolverUtils::Advection
SOLVER_UTILS_EXPORT void	InitObject (LibUtilities::SessionReaderSharedPtr pSession, Array< OneD, MultiRegions::ExpListSharedPtr > pFields)
	Interface function to initialise the advection object. More...
SOLVER_UTILS_EXPORT void	Advect (const int nConvectiveFields, const Array< OneD, MultiRegions::ExpListSharedPtr > &fields, const Array< OneD, Array< OneD, NekDouble > > &advVel, const Array< OneD, Array< OneD, NekDouble > > &inarray, Array< OneD, Array< OneD, NekDouble > > &outarray, const NekDouble &time, const Array< OneD, Array< OneD, NekDouble > > &pFwd=NullNekDoubleArrayofArray, const Array< OneD, Array< OneD, NekDouble > > &pBwd=NullNekDoubleArrayofArray)
	Interface function to advect the vector field. More...
template<typename FuncPointerT , typename ObjectPointerT >
void	SetFluxVector (FuncPointerT func, ObjectPointerT obj)
	Set the flux vector callback function. More...
void	SetRiemannSolver (RiemannSolverSharedPtr riemann)
	Set a Riemann solver object for this advection object. More...
void	SetFluxVector (AdvectionFluxVecCB fluxVector)
	Set the flux vector callback function. More...
void	SetBaseFlow (const Array< OneD, Array< OneD, NekDouble > > &inarray, const Array< OneD, MultiRegions::ExpListSharedPtr > &fields)
	Set the base flow used for linearised advection objects. More...

Detailed Description

Definition at line 46 of file LinearisedAdvection.h.

Member Typedef Documentation

typedef std::map< FloquetMatType, DNekBlkMatSharedPtr> Nektar::LinearisedAdvection::FloquetBlockMatrixMap

private

A map between matrix keys and their associated block matrices.

Definition at line 56 of file LinearisedAdvection.h.

typedef boost::shared_ptr<FloquetBlockMatrixMap> Nektar::LinearisedAdvection::FloquetBlockMatrixMapShPtr

private

A shared pointer to a BlockMatrixMap.

Definition at line 58 of file LinearisedAdvection.h.

Member Enumeration Documentation

enum Nektar::LinearisedAdvection::FloquetMatType

private

Enumerator
eForwardsCoeff
eForwardsPhys

Definition at line 48 of file LinearisedAdvection.h.

    {
        eForwardsCoeff,
        eForwardsPhys
    };

enum Nektar::LinearisedAdvection::HomogeneousType

private

Parameter for homogeneous expansions.

Enumerator
eHomogeneous1D
eHomogeneous2D
eHomogeneous3D
eNotHomogeneous

Definition at line 154 of file LinearisedAdvection.h.

    {
        eHomogeneous1D,
        eHomogeneous2D,
        eHomogeneous3D,
        eNotHomogeneous
    };

Constructor & Destructor Documentation

Nektar::LinearisedAdvection::LinearisedAdvection ( )

protected

Constructor. Creates ...

Parameters

param

Definition at line 55 of file LinearisedAdvection.cpp.

                                        :
    Advection()
{
}

Nektar::LinearisedAdvection::~LinearisedAdvection ( )

protectedvirtual

Definition at line 242 of file LinearisedAdvection.cpp.

{
}

Member Function Documentation

static SolverUtils::AdvectionSharedPtr Nektar::LinearisedAdvection::create ( std::string  )

inlinestatic

Creates an instance of this class.

Definition at line 64 of file LinearisedAdvection.h.

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

    {
        return MemoryManager<LinearisedAdvection>::AllocateSharedPtr();
    }

void Nektar::LinearisedAdvection::DFT ( const std::string  file, Array< OneD, MultiRegions::ExpListSharedPtr > &  pFields, const NekDouble  m_slices  )

protected

Definition at line 603 of file LinearisedAdvection.cpp.

References ASSERTL0, Nektar::LibUtilities::NekFactory< tKey, tBase, >::CreateInstance(), eForwardsPhys, Nektar::eWrapper, GetFloquetBlockMatrix(), Nektar::LibUtilities::GetNektarFFTFactory(), ImportFldBase(), m_baseflow, m_FFT, m_interp, m_slices, m_tmpIN, m_tmpOUT, Vmath::Smul(), Vmath::Vcopy(), and Vmath::Zero().

Referenced by v_InitObject().

{
    int ConvectedFields = m_baseflow.num_elements()-1;
    int npoints         = m_baseflow[0].num_elements();
    m_interp            = Array<OneD, Array<OneD, NekDouble> > (ConvectedFields);

    for (int i = 0; i < ConvectedFields; ++i)
    {
        m_interp[i] = Array<OneD,NekDouble>(npoints*m_slices, 0.0);
    }

    // Import the slides into auxiliary vector
    // The base flow should be stored in the form "filename_%d.ext"
    // A subdirectory can also be included, such as "dir/filename_%d.ext"
    size_t found = file.find("%d");
    ASSERTL0(found != string::npos && file.find("%d", found+1) == string::npos,
             "Since N_slices is specified, the filename provided for function "
             "'BaseFlow' must include exactly one instance of the format "
             "specifier '%d', to index the time-slices.");
    char* buffer = new char[file.length() + 8];
    for (int i = 0; i < m_slices; ++i)
    {
        sprintf(buffer, file.c_str(), i);
        ImportFldBase(buffer,pFields,i);
    }
    delete[] buffer;


    // Discrete Fourier Transform of the fields
    for(int k=0; k< ConvectedFields;++k)
    {
#ifdef NEKTAR_USING_FFTW

        //Discrete Fourier Transform using FFTW
        Array<OneD, NekDouble> fft_in(npoints*m_slices);
        Array<OneD, NekDouble> fft_out(npoints*m_slices);

        Array<OneD, NekDouble> m_tmpIN(m_slices);
        Array<OneD, NekDouble> m_tmpOUT(m_slices);

        //Shuffle the data
        for(int j= 0; j < m_slices; ++j)
        {
            Vmath::Vcopy(npoints,&m_interp[k][j*npoints],1,&(fft_in[j]),m_slices);
        }

        m_FFT = LibUtilities::GetNektarFFTFactory().CreateInstance("NekFFTW", m_slices);

        //FFT Transform
        for(int i=0; i<npoints; i++)
        {
            m_FFT->FFTFwdTrans(m_tmpIN =fft_in + i*m_slices, m_tmpOUT =fft_out + i*m_slices);

        }

        //Reshuffle data
        for(int s = 0; s < m_slices; ++s)
        {
            Vmath::Vcopy(npoints,&fft_out[s],m_slices,&m_interp[k][s*npoints],1);

        }

        Vmath::Zero(fft_in.num_elements(),&fft_in[0],1);
        Vmath::Zero(fft_out.num_elements(),&fft_out[0],1);
#else
        //Discrete Fourier Transform using MVM
        DNekBlkMatSharedPtr blkmat;
        blkmat = GetFloquetBlockMatrix(eForwardsPhys);

        int nrows = blkmat->GetRows();
        int ncols = blkmat->GetColumns();

        Array<OneD, NekDouble> sortedinarray(ncols);
        Array<OneD, NekDouble> sortedoutarray(nrows);

        //Shuffle the data
        for(int j= 0; j < m_slices; ++j)
        {
            Vmath::Vcopy(npoints,&m_interp[k][j*npoints],1,&(sortedinarray[j]),m_slices);
        }

        // Create NekVectors from the given data arrays
        NekVector<NekDouble> in (ncols,sortedinarray,eWrapper);
        NekVector<NekDouble> out(nrows,sortedoutarray,eWrapper);

        // Perform matrix-vector multiply.
        out = (*blkmat)*in;

        //Reshuffle data
        for(int s = 0; s < m_slices; ++s)
        {
            Vmath::Vcopy(npoints,&sortedoutarray[s],m_slices,&m_interp[k][s*npoints],1);
        }

        for(int r=0; r<sortedinarray.num_elements();++r)
        {
            sortedinarray[0]=0;
            sortedoutarray[0]=0;
        }

#endif

        //scaling of the Fourier coefficients
        NekDouble j=-1;
        for (int i = 2; i < m_slices; i += 2)
        {
            Vmath::Smul(2*npoints,j,&m_interp[k][i*npoints],1,&m_interp[k][i*npoints],1);
            j=-j;

        }

    }

}

DNekBlkMatSharedPtr Nektar::LinearisedAdvection::GenFloquetBlockMatrix ( FloquetMatType  mattype, bool  UseContCoeffs = false  ) const

protected

DNekBlkMatSharedPtr Nektar::LinearisedAdvection::GetFloquetBlockMatrix ( FloquetMatType  mattype, bool  UseContCoeffs = false  ) const

protected

Definition at line 564 of file LinearisedAdvection.cpp.

References Nektar::MemoryManager< DataType >::AllocateSharedPtr(), Nektar::StdRegions::StdExpansion::DetShapeType(), Nektar::eDIAGONAL, Nektar::LibUtilities::eFourier, Nektar::LibUtilities::eFourierEvenlySpaced, Nektar::StdRegions::eFwdTrans, Nektar::StdRegions::StdExpansion::GetStdMatrix(), m_baseflow, and m_slices.

Referenced by DFT().

{
    DNekMatSharedPtr    loc_mat;
    DNekBlkMatSharedPtr BlkMatrix;
    int n_exp = 0;

    n_exp = m_baseflow[0].num_elements(); // will operatore on m_phys

    Array<OneD,unsigned int> nrows(n_exp);
    Array<OneD,unsigned int> ncols(n_exp);

    nrows = Array<OneD, unsigned int>(n_exp,m_slices);
    ncols = Array<OneD, unsigned int>(n_exp,m_slices);

    MatrixStorage blkmatStorage = eDIAGONAL;
    BlkMatrix = MemoryManager<DNekBlkMat>
        ::AllocateSharedPtr(nrows,ncols,blkmatStorage);


    const LibUtilities::PointsKey Pkey(m_slices,LibUtilities::eFourierEvenlySpaced);
    const LibUtilities::BasisKey  BK(LibUtilities::eFourier,m_slices,Pkey);
    StdRegions::StdSegExp StdSeg(BK);

    StdRegions::StdMatrixKey matkey(StdRegions::eFwdTrans,
                                    StdSeg.DetShapeType(),
                                    StdSeg);

    loc_mat = StdSeg.GetStdMatrix(matkey);

    // set up array of block matrices.
    for(int i = 0; i < n_exp; ++i)
    {
        BlkMatrix->SetBlock(i,i,loc_mat);
    }

    return BlkMatrix;
}

void Nektar::LinearisedAdvection::ImportFldBase ( std::string  pInfile, Array< OneD, MultiRegions::ExpListSharedPtr > &  pFields, int  pSlice  )

protected

Import Base flow.

Import field from infile and load into m_fields. This routine will also perform a BwdTrans to ensure data is in both the physical and coefficient storage.

Parameters

pInFile	Filename to read.
pFields	Array of expansion lists

Definition at line 397 of file LinearisedAdvection.cpp.

References ASSERTL0, Nektar::LibUtilities::FieldIO::CreateForFile(), Vmath::Fill(), m_baseflow, m_halfMode, m_interp, m_npointsZ, m_session, m_singleMode, Nektar::LibUtilities::NullFieldMetaDataMap, and Vmath::Vcopy().

Referenced by DFT(), and v_InitObject().

{
    std::vector<LibUtilities::FieldDefinitionsSharedPtr> FieldDef;
    std::vector<std::vector<NekDouble> >                 FieldData;

    int nqtot = m_baseflow[0].num_elements();
    Array<OneD, NekDouble> tmp_coeff(pFields[0]->GetNcoeffs(), 0.0);

    int numexp = pFields[0]->GetExpSize();
    Array<OneD,int> ElementGIDs(numexp);

    // Define list of global element ids
    for(int i = 0; i < numexp; ++i)
    {
        ElementGIDs[i] = pFields[0]->GetExp(i)->GetGeom()->GetGlobalID();
    }

    //Get Homogeneous
    LibUtilities::FieldIOSharedPtr fld = LibUtilities::FieldIO::CreateForFile(
        m_session, pInfile);
    fld->Import(pInfile, FieldDef, FieldData,
                LibUtilities::NullFieldMetaDataMap,
                ElementGIDs);

    int nSessionVar     = m_session->GetVariables().size();
    int nSessionConvVar = nSessionVar - 1;
    int nFileVar        = FieldDef[0]->m_fields.size();
    int nFileConvVar    = nFileVar - 1; // Ignore pressure
    if (m_halfMode)
    {
        ASSERTL0(nFileVar == 3, "For half mode, expect 2D2C base flow.");
        nFileConvVar = 2;
    }

    for(int j = 0; j < nFileConvVar; ++j)
    {
        for(int i = 0; i < FieldDef.size(); ++i)
        {
            bool flag = FieldDef[i]->m_fields[j] ==
                m_session->GetVariable(j);

            ASSERTL0(flag, (std::string("Order of ") + pInfile
                            + std::string(" data and that defined in "
                            "the session file differs")).c_str());

            pFields[j]->ExtractDataToCoeffs(
                                FieldDef[i],
                                FieldData[i],
                                FieldDef[i]->m_fields[j],
                                tmp_coeff);
        }

        if(m_singleMode || m_halfMode)
        {
            pFields[j]->GetPlane(0)->BwdTrans(tmp_coeff, m_baseflow[j]);

            if(m_singleMode)
            {
                //copy the bwd trans into the second plane for single
                //Mode Analysis
                int ncplane=(pFields[0]->GetNpoints())/m_npointsZ;
                Vmath::Vcopy(ncplane,&m_baseflow[j][0],1,&m_baseflow[j][ncplane],1);
            }
        }
        else // fully 3D base flow - put in physical space.
        {
            bool oldwavespace = pFields[j]->GetWaveSpace();
            pFields[j]->SetWaveSpace(false);
            pFields[j]->BwdTrans(tmp_coeff, m_baseflow[j]);
            pFields[j]->SetWaveSpace(oldwavespace);
        }
    }

    // Zero unused fields (e.g. w in a 2D2C base flow).
    for (int j = nFileConvVar; j < nSessionConvVar; ++j)
    {
        Vmath::Fill(nqtot, 0.0, m_baseflow[j], 1);
    }

    // If time-periodic, put loaded data into the slice storage.
    if(m_session->DefinesParameter("N_slices"))
    {
        for(int i = 0; i < nSessionConvVar; ++i)
        {
            Vmath::Vcopy(nqtot, &m_baseflow[i][0], 1, &m_interp[i][pSlice*nqtot], 1);
        }
    }
}

void Nektar::LinearisedAdvection::UpdateBase ( const NekDouble  m_slices, const Array< OneD, const NekDouble > &  inarray, Array< OneD, NekDouble > &  outarray, const NekDouble  m_time, const NekDouble  m_period  )

protected

Definition at line 490 of file LinearisedAdvection.cpp.

References m_baseflow, m_period, m_slices, Vmath::Svtvp(), and Vmath::Vcopy().

Referenced by Nektar::AdjointAdvection::v_Advect(), and v_Advect().

{
    int npoints     = m_baseflow[0].num_elements();
    NekDouble BetaT = 2*M_PI*fmod (m_time, m_period) / m_period;
    NekDouble phase;
    Array<OneD, NekDouble> auxiliary(npoints);

    Vmath::Vcopy(npoints,&inarray[0],1,&outarray[0],1);
    Vmath::Svtvp(npoints, cos(0.5*m_slices*BetaT),&inarray[npoints],1,&outarray[0],1,&outarray[0],1);

    for (int i = 2; i < m_slices; i += 2)
    {
        phase = (i>>1) * BetaT;

        Vmath::Svtvp(npoints, cos(phase),&inarray[i*npoints],1,&outarray[0],1,&outarray[0],1);
        Vmath::Svtvp(npoints, -sin(phase), &inarray[(i+1)*npoints], 1, &outarray[0], 1,&outarray[0],1);
    }

}

void Nektar::LinearisedAdvection::UpdateGradBase ( const int  var, const MultiRegions::ExpListSharedPtr &  field  )

protected

Definition at line 515 of file LinearisedAdvection.cpp.

References m_baseflow, m_gradBase, m_halfMode, m_singleMode, and m_spacedim.

Referenced by Nektar::AdjointAdvection::v_Advect(), v_Advect(), v_InitObject(), and v_SetBaseFlow().

{
    int nBaseDerivs = (m_halfMode || m_singleMode) ? 2 : m_spacedim;
    switch(m_spacedim)
    {
        case 1:         // 1D
        {
            field->PhysDeriv(m_baseflow[var], m_gradBase[var*nBaseDerivs + 0]);
        }
        break;
        case 2:  //2D
        {
            field->PhysDeriv(m_baseflow[var], m_gradBase[var*nBaseDerivs + 0],
                                              m_gradBase[var*nBaseDerivs + 1]);
        }
        break;
        case 3:
        {
            if(m_halfMode) // can assume W = 0 and  d/dz == 0
            {
                if( var < 2)
                {
                    field->PhysDeriv(m_baseflow[var],
                                              m_gradBase[var*nBaseDerivs + 0],
                                              m_gradBase[var*nBaseDerivs + 1]);
                }
            }
            else if(m_singleMode) // single mode where d/dz = 0
            {
                field->PhysDeriv(m_baseflow[var], m_gradBase[var*nBaseDerivs + 0],
                                                  m_gradBase[var*nBaseDerivs + 1]);
            }
            else
            {
                // Differentiate base flow in physical space
                bool oldwavespace = field->GetWaveSpace();
                field->SetWaveSpace(false);
                field->PhysDeriv(m_baseflow[var], m_gradBase[var*nBaseDerivs + 0],
                                                  m_gradBase[var*nBaseDerivs + 1],
                                                  m_gradBase[var*nBaseDerivs + 2]);
                field->SetWaveSpace(oldwavespace);
            }
        }
        break;
    }
}

void Nektar::LinearisedAdvection::v_Advect ( const int  nConvectiveFields, const Array< OneD, MultiRegions::ExpListSharedPtr > &  fields, const Array< OneD, Array< OneD, NekDouble > > &  advVel, const Array< OneD, Array< OneD, NekDouble > > &  inarray, Array< OneD, Array< OneD, NekDouble > > &  outarray, const NekDouble &  time, const Array< OneD, Array< OneD, NekDouble > > &  pFwd = NullNekDoubleArrayofArray, const Array< OneD, Array< OneD, NekDouble > > &  pBwd = NullNekDoubleArrayofArray  )

protectedvirtual

Advects a vector field.

Implements Nektar::SolverUtils::Advection.

Reimplemented in Nektar::AdjointAdvection.

Definition at line 249 of file LinearisedAdvection.cpp.

References ASSERTL1, m_baseflow, m_gradBase, m_halfMode, m_interp, m_multipleModes, m_period, m_singleMode, m_slices, m_spacedim, Vmath::Neg(), UpdateBase(), UpdateGradBase(), Vmath::Vmul(), and Vmath::Vvtvp().

{
    ASSERTL1(nConvectiveFields == inarray.num_elements(),
             "Number of convective fields and Inarray are not compatible");

    int nPointsTot  = fields[0]->GetNpoints();
    int ndim        = advVel.num_elements();
    int nBaseDerivs = (m_halfMode || m_singleMode) ? 2 : m_spacedim;
    int nDerivs     = (m_halfMode) ? 2 : m_spacedim;

    Array<OneD, Array<OneD, NekDouble> > velocity(ndim);
    for(int i = 0; i < ndim; ++i)
    {
        if(fields[i]->GetWaveSpace() && !m_singleMode && !m_halfMode)
        {
            velocity[i] = Array<OneD, NekDouble>(nPointsTot,0.0);
            fields[i]->HomogeneousBwdTrans(advVel[i],velocity[i]);
        }
        else
        {
            velocity[i] = advVel[i];
        }
    }

    Array<OneD, Array<OneD, NekDouble> > grad (nDerivs);
    for( int i = 0; i < nDerivs; ++i)
    {
        grad[i] = Array<OneD, NekDouble> (nPointsTot);
    }

    // Evaluation of the base flow for periodic cases
    if (m_slices > 1)
    {
        for (int i = 0; i < ndim; ++i)
        {
            UpdateBase(m_slices, m_interp[i], m_baseflow[i],
                       time, m_period);
            UpdateGradBase(i, fields[i]);
        }
    }

    //Evaluate the linearised advection term
    for( int i = 0; i < ndim; ++i)
    {
        // Calculate gradient
        switch(nDerivs)
        {
            case 1:
            {
                fields[i]->PhysDeriv(inarray[i], grad[0]);
            }
            break;
            case 2:
            {
                fields[i]->PhysDeriv(inarray[i], grad[0], grad[1]);
            }
            break;
            case 3:
            {
                fields[i]->PhysDeriv(inarray[i], grad[0], grad[1], grad[2]);
                if(m_multipleModes)
                {
                    // transform gradients into physical Fourier space
                    fields[i]->HomogeneousBwdTrans(grad[0], grad[0]);
                    fields[i]->HomogeneousBwdTrans(grad[1], grad[1]);
                    fields[i]->HomogeneousBwdTrans(grad[2], grad[2]);
                }
            }
            break;
        }

        // Calculate U_j du'_i/dx_j
        Vmath::Vmul(nPointsTot,grad[0], 1, m_baseflow[0], 1, outarray[i], 1);
        for( int j = 1; j < nDerivs; ++j)
        {
            Vmath::Vvtvp(nPointsTot,grad[j], 1,
                                    m_baseflow[j], 1,
                                    outarray[i], 1,
                                    outarray[i], 1);
        }

        // Add u'_j dU_i/dx_j
        int lim = (m_halfMode || m_singleMode) ? 2 : ndim;
        if (m_halfMode && i==2)
        {
            lim = 0;
        }
        for( int j = 0; j < lim; ++j)
        {
            Vmath::Vvtvp(nPointsTot,m_gradBase[i*nBaseDerivs + j], 1,
                                    velocity[j], 1,
                                    outarray[i], 1,
                                    outarray[i], 1);
        }

        if(m_multipleModes)
        {
            fields[i]->HomogeneousFwdTrans(outarray[i],outarray[i]);
        }
        Vmath::Neg(nPointsTot,outarray[i],1);
    }
}

void Nektar::LinearisedAdvection::v_InitObject ( LibUtilities::SessionReaderSharedPtr  pSession, Array< OneD, MultiRegions::ExpListSharedPtr >  pFields  )

protectedvirtual

Initialises the advection object.

This function should be overridden in derived classes to initialise the specific advection data members. However, this base class function should be called as the first statement of the overridden function to ensure the base class is correctly initialised in order.

Parameters

pSession	Session information.
pFields	Expansion lists for scalar fields.

Reimplemented from Nektar::SolverUtils::Advection.

Definition at line 61 of file LinearisedAdvection.cpp.

References Nektar::MemoryManager< DataType >::AllocateSharedPtr(), ASSERTL0, DFT(), Nektar::LibUtilities::eFunctionTypeFile, eHomogeneous1D, eHomogeneous2D, eHomogeneous3D, eNotHomogeneous, ImportFldBase(), m_baseflow, m_boundaryConditions, m_expdim, m_gradBase, m_halfMode, m_HomoDirec, m_HomogeneousType, m_LhomX, m_LhomY, m_LhomZ, m_multipleModes, m_npointsX, m_npointsY, m_npointsZ, m_period, m_session, m_singleMode, m_slices, m_spacedim, m_useFFT, UpdateGradBase(), and Nektar::SolverUtils::Advection::v_InitObject().

{
    Advection::v_InitObject(pSession, pFields);

    m_session            = pSession;
    m_boundaryConditions = MemoryManager<SpatialDomains::BoundaryConditions>
        ::AllocateSharedPtr(m_session, pFields[0]->GetGraph());
    m_spacedim           = pFields[0]->GetGraph()->GetSpaceDimension();
    m_expdim             = pFields[0]->GetGraph()->GetMeshDimension();

    //Setting parameters for homogeneous problems
    m_HomoDirec          = 0;
    m_useFFT             = false;
    m_HomogeneousType    = eNotHomogeneous;
    m_singleMode         = false;
    m_halfMode           = false;
    m_multipleModes      = false;

    if(m_session->DefinesSolverInfo("HOMOGENEOUS"))
    {
        std::string HomoStr = m_session->GetSolverInfo("HOMOGENEOUS");
        m_spacedim          = 3;

        if((HomoStr == "HOMOGENEOUS1D")||(HomoStr == "Homogeneous1D")||
           (HomoStr == "1D")||(HomoStr == "Homo1D"))
        {
            m_HomogeneousType = eHomogeneous1D;
            m_LhomZ           = m_session->GetParameter("LZ");
            m_HomoDirec       = 1;

            ASSERTL0(m_session->DefinesSolverInfo("ModeType"),
                     "Need to specify ModeType as HalfMode,SingleMode or "
                     "MultipleModes");

            m_session->MatchSolverInfo("ModeType",      "SingleMode",
                                       m_singleMode,    false);
            m_session->MatchSolverInfo("ModeType",      "HalfMode",
                                       m_halfMode,      false);
            m_session->MatchSolverInfo("ModeType",      "MultipleModes",
                                       m_multipleModes, false);

            if(m_singleMode)
            {
                m_npointsZ = 2;
            }
            else if(m_halfMode)
            {
                m_npointsZ = 1;
            }
            else if(m_multipleModes)
            {
                m_npointsZ = m_session->GetParameter("HomModesZ");
            }
        }

        if((HomoStr == "HOMOGENEOUS2D")||(HomoStr == "Homogeneous2D")||
           (HomoStr == "2D")||(HomoStr == "Homo2D"))
        {
            m_HomogeneousType = eHomogeneous2D;
            m_session->LoadParameter("HomModesY", m_npointsY);
            m_session->LoadParameter("LY",        m_LhomY);
            m_session->LoadParameter("HomModesZ", m_npointsZ);
            m_session->LoadParameter("LZ",        m_LhomZ);
            m_HomoDirec       = 2;
        }

        if((HomoStr == "HOMOGENEOUS3D")||(HomoStr == "Homogeneous3D")||
           (HomoStr == "3D")||(HomoStr == "Homo3D"))
        {
            m_HomogeneousType = eHomogeneous3D;
            m_session->LoadParameter("HomModesX",m_npointsX);
            m_session->LoadParameter("LX",       m_LhomX   );
            m_session->LoadParameter("HomModesY",m_npointsY);
            m_session->LoadParameter("LY",       m_LhomY   );
            m_session->LoadParameter("HomModesZ",m_npointsZ);
            m_session->LoadParameter("LZ",       m_LhomZ   );
            m_HomoDirec       = 3;
        }

        if(m_session->DefinesSolverInfo("USEFFT"))
        {
            m_useFFT = true;
        }
    }
    else
    {
        m_npointsZ = 1; // set to default value so can use to identify 2d or 3D (homogeneous) expansions
    }

    int nvar = m_session->GetVariables().size();
    m_baseflow = Array<OneD, Array<OneD, NekDouble> >(nvar);
    for (int i = 0; i < nvar; ++i)
    {
        m_baseflow[i] = Array<OneD, NekDouble>(pFields[i]->GetTotPoints(), 0.0);
    }

    int nBaseDerivs = (m_halfMode || m_singleMode) ? 2 : m_spacedim;
    m_gradBase = Array<OneD, Array<OneD, NekDouble> >(nvar*nBaseDerivs);
    for (int i = 0; i < nvar; ++i)
    {
        for (int j = 0; j < nBaseDerivs; ++j)
        {
            m_gradBase[i*nBaseDerivs + j ] = Array<OneD, NekDouble>
                                            (pFields[i]->GetTotPoints(), 0.0);
        }
    }

    ASSERTL0(m_session->DefinesFunction("BaseFlow"),
             "Base flow must be defined for linearised forms.");
    string file = m_session->GetFunctionFilename("BaseFlow", 0);


    //Periodic base flows
    if(m_session->DefinesParameter("N_slices"))
    {
        m_session->LoadParameter("N_slices",m_slices);
        if(m_slices>1)
        {
            ASSERTL0(m_session->GetFunctionType("BaseFlow", 0)
                == LibUtilities::eFunctionTypeFile,
                "Base flow should be a sequence of files.");
            DFT(file,pFields,m_slices);
        }
        else
        {
            ASSERTL0(false, "Number of slices must be a positive number "
                            "greater than 1");
        }
    }
    //Steady base-flow
    else
    {
        m_slices=1;

        //BaseFlow from file
        if (m_session->GetFunctionType("BaseFlow", m_session->GetVariable(0))
            == LibUtilities::eFunctionTypeFile)
        {
            ImportFldBase(file,pFields,1);

        }
        //analytic base flow
        else
        {
            int nq = pFields[0]->GetNpoints();
            Array<OneD,NekDouble> x0(nq);
            Array<OneD,NekDouble> x1(nq);
            Array<OneD,NekDouble> x2(nq);

            // get the coordinates (assuming all fields have the same
            // discretisation)
            pFields[0]->GetCoords(x0,x1,x2);

            for(unsigned int i = 0 ; i < pFields.num_elements(); i++)
            {
                LibUtilities::EquationSharedPtr ifunc
                    = m_session->GetFunction("BaseFlow", i);

                ifunc->Evaluate(x0,x1,x2,m_baseflow[i]);
            }
        }
    }

    for (int i = 0; i < nvar; ++i)
    {
        UpdateGradBase(i, pFields[i]);
    }

    if(m_session->DefinesParameter("period"))
    {
        m_period=m_session->GetParameter("period");
    }
    else
    {
        m_period=(m_session->GetParameter("TimeStep")*m_slices)/(m_slices-1.);
    }

}

void Nektar::LinearisedAdvection::v_SetBaseFlow ( const Array< OneD, Array< OneD, NekDouble > > &  inarray, const Array< OneD, MultiRegions::ExpListSharedPtr > &  fields  )

protectedvirtual

Overrides the base flow used during linearised advection.

Reimplemented from Nektar::SolverUtils::Advection.

Definition at line 360 of file LinearisedAdvection.cpp.

References ASSERTL1, m_baseflow, m_session, npts, UpdateGradBase(), and Vmath::Vcopy().

{
    if (m_session->GetSolverInfo("EqType") == "UnsteadyNavierStokes")
    {
        // The SFD method is only applied to the velocity variables in
        // incompressible
        ASSERTL1(inarray.num_elements() == (m_baseflow.num_elements() - 1),
                 "Number of base flow variables does not match what is "
                 "expected.");
    }
    else
    {
        ASSERTL1(inarray.num_elements() == (m_baseflow.num_elements()),
             "Number of base flow variables does not match what is expected.");
    }

    int npts = inarray[0].num_elements();

    for (int i = 0; i < inarray.num_elements(); ++i)
    {
        ASSERTL1(npts == m_baseflow[i].num_elements(),
             "Size of base flow array does not match expected.");
        Vmath::Vcopy(npts, inarray[i], 1, m_baseflow[i], 1);
        UpdateGradBase(i, fields[i]);
    }
}

Friends And Related Function Documentation

friend class MemoryManager< LinearisedAdvection >

friend

Definition at line 61 of file LinearisedAdvection.h.

Member Data Documentation

string Nektar::LinearisedAdvection::className

static

Initial value:

= SolverUtils::GetAdvectionFactory().RegisterCreatorFunction(
                "Linearised",
                LinearisedAdvection::create)

Name of class.

Definition at line 69 of file LinearisedAdvection.h.

Array<OneD, Array<OneD, NekDouble> > Nektar::LinearisedAdvection::m_baseflow

protected

Storage for base flow.

Definition at line 78 of file LinearisedAdvection.h.

Referenced by DFT(), GetFloquetBlockMatrix(), ImportFldBase(), UpdateBase(), UpdateGradBase(), Nektar::AdjointAdvection::v_Advect(), v_Advect(), v_InitObject(), and v_SetBaseFlow().

SpatialDomains::BoundaryConditionsSharedPtr Nektar::LinearisedAdvection::m_boundaryConditions

private

Definition at line 179 of file LinearisedAdvection.h.

Referenced by v_InitObject().

int Nektar::LinearisedAdvection::m_expdim

protected

Definition at line 75 of file LinearisedAdvection.h.

Referenced by v_InitObject().

LibUtilities::NektarFFTSharedPtr Nektar::LinearisedAdvection::m_FFT

protected

auxiliary variables

Definition at line 88 of file LinearisedAdvection.h.

Referenced by DFT().

FloquetBlockMatrixMapShPtr Nektar::LinearisedAdvection::m_FloquetBlockMat

protected

Definition at line 105 of file LinearisedAdvection.h.

Array<OneD, Array<OneD, NekDouble> > Nektar::LinearisedAdvection::m_gradBase

protected

Definition at line 79 of file LinearisedAdvection.h.

Referenced by UpdateGradBase(), Nektar::AdjointAdvection::v_Advect(), v_Advect(), and v_InitObject().

bool Nektar::LinearisedAdvection::m_halfMode

protected

flag to determine if use half mode or not

Definition at line 95 of file LinearisedAdvection.h.

Referenced by ImportFldBase(), UpdateGradBase(), Nektar::AdjointAdvection::v_Advect(), v_Advect(), and v_InitObject().

int Nektar::LinearisedAdvection::m_HomoDirec

private

number of homogenous directions

Definition at line 175 of file LinearisedAdvection.h.

Referenced by v_InitObject().

enum HomogeneousType Nektar::LinearisedAdvection::m_HomogeneousType

private

Definition at line 165 of file LinearisedAdvection.h.

Referenced by v_InitObject().

Array<OneD, Array<OneD, NekDouble> > Nektar::LinearisedAdvection::m_interp

protected

interpolation vector

Definition at line 86 of file LinearisedAdvection.h.

Referenced by DFT(), ImportFldBase(), Nektar::AdjointAdvection::v_Advect(), and v_Advect().

NekDouble Nektar::LinearisedAdvection::m_LhomX

private

physical length in X direction (if homogeneous)

Definition at line 167 of file LinearisedAdvection.h.

Referenced by v_InitObject().

NekDouble Nektar::LinearisedAdvection::m_LhomY

private

physical length in Y direction (if homogeneous)

Definition at line 168 of file LinearisedAdvection.h.

Referenced by v_InitObject().

NekDouble Nektar::LinearisedAdvection::m_LhomZ

private

physical length in Z direction (if homogeneous)

Definition at line 169 of file LinearisedAdvection.h.

Referenced by v_InitObject().

bool Nektar::LinearisedAdvection::m_multipleModes

protected

flag to determine if use multiple mode or not

Definition at line 97 of file LinearisedAdvection.h.

Referenced by Nektar::AdjointAdvection::v_Advect(), v_Advect(), and v_InitObject().

int Nektar::LinearisedAdvection::m_npointsX

private

number of points in X direction (if homogeneous)

Definition at line 171 of file LinearisedAdvection.h.

Referenced by v_InitObject().

int Nektar::LinearisedAdvection::m_npointsY

private

number of points in Y direction (if homogeneous)

Definition at line 172 of file LinearisedAdvection.h.

Referenced by v_InitObject().

int Nektar::LinearisedAdvection::m_npointsZ

private

number of points in Z direction (if homogeneous)

Definition at line 173 of file LinearisedAdvection.h.

Referenced by ImportFldBase(), and v_InitObject().

int Nektar::LinearisedAdvection::m_NumMode

private

Mode to use in case of single mode analysis.

Definition at line 177 of file LinearisedAdvection.h.

NekDouble Nektar::LinearisedAdvection::m_period

protected

period length

Definition at line 84 of file LinearisedAdvection.h.

Referenced by UpdateBase(), Nektar::AdjointAdvection::v_Advect(), v_Advect(), and v_InitObject().

LibUtilities::SessionReaderSharedPtr Nektar::LinearisedAdvection::m_session

protected

Definition at line 72 of file LinearisedAdvection.h.

Referenced by ImportFldBase(), v_InitObject(), and v_SetBaseFlow().

bool Nektar::LinearisedAdvection::m_singleMode

protected

flag to determine if use single mode or not

Definition at line 93 of file LinearisedAdvection.h.

Referenced by ImportFldBase(), UpdateGradBase(), Nektar::AdjointAdvection::v_Advect(), v_Advect(), and v_InitObject().

int Nektar::LinearisedAdvection::m_slices

protected

number of slices

Definition at line 82 of file LinearisedAdvection.h.

Referenced by DFT(), GetFloquetBlockMatrix(), UpdateBase(), Nektar::AdjointAdvection::v_Advect(), v_Advect(), and v_InitObject().

int Nektar::LinearisedAdvection::m_spacedim

protected

Definition at line 74 of file LinearisedAdvection.h.

Referenced by UpdateGradBase(), Nektar::AdjointAdvection::v_Advect(), v_Advect(), and v_InitObject().

Array<OneD,NekDouble> Nektar::LinearisedAdvection::m_tmpIN

protected

Definition at line 89 of file LinearisedAdvection.h.

Referenced by DFT().

Array<OneD,NekDouble> Nektar::LinearisedAdvection::m_tmpOUT

protected

Definition at line 90 of file LinearisedAdvection.h.

Referenced by DFT().

bool Nektar::LinearisedAdvection::m_useFFT

private

flag to determine if use or not the FFT for transformations

Definition at line 163 of file LinearisedAdvection.h.

Referenced by v_InitObject().

bool Nektar::LinearisedAdvection::m_useFFTW

protected

Definition at line 91 of file LinearisedAdvection.h.