Nektar::FieldUtils::ProcessMultiShear Class Reference

This processing module calculates the shear stress metrics and writes it to a surface output file. More...

#include <ProcessMultiShear.h>

Inheritance diagram for Nektar::FieldUtils::ProcessMultiShear:

Public Member Functions
	ProcessMultiShear (FieldSharedPtr f)
virtual	~ProcessMultiShear ()
virtual void	Process (po::variables_map &vm)
	Write mesh to output file. More...
virtual std::string	GetModuleName ()
virtual std::string	GetModuleDescription ()
virtual ModulePriority	GetModulePriority ()
Public Member Functions inherited from Nektar::FieldUtils::ProcessModule
	ProcessModule ()
	ProcessModule (FieldSharedPtr p_f)
Public Member Functions inherited from Nektar::FieldUtils::Module
FIELD_UTILS_EXPORT	Module (FieldSharedPtr p_f)
FIELD_UTILS_EXPORT void	RegisterConfig (std::string key, std::string value="")
	Register a configuration option with a module. More...
FIELD_UTILS_EXPORT void	PrintConfig ()
	Print out all configuration options for a module. More...
FIELD_UTILS_EXPORT void	SetDefaults ()
	Sets default configuration options for those which have not been set. More...
FIELD_UTILS_EXPORT void	EvaluateTriFieldAtEquiSpacedPts (LocalRegions::ExpansionSharedPtr &exp, const Array< OneD, const NekDouble > &infield, Array< OneD, NekDouble > &outfield)

Static Public Member Functions
static std::shared_ptr< Module >	create (FieldSharedPtr f)
	Creates an instance of this class. More...

Static Public Attributes
static ModuleKey	className

Additional Inherited Members
Protected Member Functions inherited from Nektar::FieldUtils::Module
	Module ()
Protected Attributes inherited from Nektar::FieldUtils::Module
FieldSharedPtr	m_f
	Field object. More...
std::map< std::string, ConfigOption >	m_config
	List of configuration values. More...

Detailed Description

This processing module calculates the shear stress metrics and writes it to a surface output file.

Definition at line 49 of file ProcessMultiShear.h.

Constructor & Destructor Documentation

ProcessMultiShear()

Nektar::FieldUtils::ProcessMultiShear::ProcessMultiShear

(

FieldSharedPtr

f

)

Definition at line 58 of file ProcessMultiShear.cpp.

References Nektar::FieldUtils::Module::m_config.

                                                     : ProcessModule(f)
{
    m_config["N"] = ConfigOption(false, "1", "Number of chk or fld files");
    m_config["fromfld"] = ConfigOption(
        false, "NotSet",
        "First fld file. First underscore flags position of id in name.");
}

~ProcessMultiShear()

Nektar::FieldUtils::ProcessMultiShear::~ProcessMultiShear ( )

virtual

Definition at line 66 of file ProcessMultiShear.cpp.

{
}

Member Function Documentation

create()

static std::shared_ptr<Module> Nektar::FieldUtils::ProcessMultiShear::create ( FieldSharedPtr  f )

inlinestatic

Creates an instance of this class.

Definition at line 53 of file ProcessMultiShear.h.

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

    {
        return MemoryManager<ProcessMultiShear>::AllocateSharedPtr(f);
    }

GetModuleDescription()

virtual std::string Nektar::FieldUtils::ProcessMultiShear::GetModuleDescription ( )

inlinevirtual

Reimplemented from Nektar::FieldUtils::Module.

Definition at line 70 of file ProcessMultiShear.h.

    {
        return "Calculating shear stress metrics";
    }

GetModuleName()

virtual std::string Nektar::FieldUtils::ProcessMultiShear::GetModuleName ( )

inlinevirtual

Implements Nektar::FieldUtils::Module.

Definition at line 65 of file ProcessMultiShear.h.

    {
        return "ProcessMultiShear";
    }

GetModulePriority()

virtual ModulePriority Nektar::FieldUtils::ProcessMultiShear::GetModulePriority ( )

inlinevirtual

Implements Nektar::FieldUtils::Module.

Definition at line 75 of file ProcessMultiShear.h.

References Nektar::FieldUtils::eModifyExp.

    {
        return eModifyExp;
    }

Process()

void Nektar::FieldUtils::ProcessMultiShear::Process ( po::variables_map &  vm )

virtual

Write mesh to output file.

Implements Nektar::FieldUtils::Module.

Definition at line 70 of file ProcessMultiShear.cpp.

References ASSERTL0, Nektar::FieldUtils::Module::m_config, Nektar::FieldUtils::Module::m_f, Nektar::LibUtilities::NullFieldMetaDataMap, Vmath::Smul(), Vmath::Vadd(), Vmath::Vdiv(), Vmath::Vmul(), Vmath::Vsqrt(), Vmath::Vvtvm(), Vmath::Vvtvp(), and Vmath::Zero().

{
    boost::ignore_unused(vm);

    // Skip in case of empty partition
    if (m_f->m_exp[0]->GetNumElmts() == 0)
    {
        return;
    }

    ASSERTL0(m_config["fromfld"].as<string>().compare("NotSet") != 0,
             "Need to specify fromfld=file.fld ");

    int nstart, i, j, nfields=0;
    bool wssg      = false;
    NekDouble nfld = m_config["N"].as<NekDouble>();
    string fromfld, basename, endname, nstartStr;
    stringstream filename;
    vector<string> infiles(nfld);
    vector<std::shared_ptr<Field> > fromField(nfld);

    // Set up list of input fld files.
    fromfld  = m_config["fromfld"].as<string>();
    basename = fromfld.substr(0, fromfld.find_first_of("_") + 1);
    filename << fromfld.substr(fromfld.find_first_of("_") + 1, fromfld.size());
    filename >> nstart;
    filename.str("");
    filename << nstart;
    filename >> nstartStr;
    filename.str("");
    endname = fromfld.substr(fromfld.find(nstartStr) + nstartStr.size(),
                             fromfld.size());

    for (i = 0; i < nfld; ++i)
    {
        stringstream filename;
        filename << basename << i + nstart << endname;
        filename >> infiles[i];
        cout << infiles[i] << endl;
    }

    for (i = 0; i < nfld; ++i)
    {
        fromField[i]            = std::shared_ptr<Field>(new Field());
        fromField[i]->m_session = m_f->m_session;
        fromField[i]->m_graph   = m_f->m_graph;
    }

    // Import all fld files.
    for (i = 0; i < nfld; ++i)
    {
        if (m_f->m_exp.size())
        {
            // Set up ElementGIDs in case of parallel processing
            Array<OneD, int> ElementGIDs(m_f->m_exp[0]->GetExpSize());
            for (j = 0; j < m_f->m_exp[0]->GetExpSize(); ++j)
            {
                ElementGIDs[j] =
                    m_f->m_exp[0]->GetExp(j)->GetGeom()->GetGlobalID();
            }
            m_f->FieldIOForFile(infiles[i])->Import(
                infiles[i], fromField[i]->m_fielddef, fromField[i]->m_data,
                LibUtilities::NullFieldMetaDataMap, ElementGIDs);
        }
        else
        {
            m_f->FieldIOForFile(infiles[i])->Import(
                infiles[i], fromField[i]->m_fielddef, fromField[i]->m_data,
                LibUtilities::NullFieldMetaDataMap);
        }

        nfields = fromField[i]->m_fielddef[0]->m_fields.size();
        int NumHomogeneousDir =
            fromField[i]->m_fielddef[0]->m_numHomogeneousDir;

        if (nfields == 5 || nfields == 7)
        {
            wssg = true;
        }

        // Set up Expansion information to use mode order from field
        fromField[i]->m_graph->SetExpansions(fromField[i]->m_fielddef);

        // Set up expansions, and extract data.
        fromField[i]->m_exp.resize(nfields);
        fromField[i]->m_exp[0] =
            fromField[i]->SetUpFirstExpList(NumHomogeneousDir, true);

        for (j = 1; j < nfields; ++j)
        {
            fromField[i]->m_exp[j] = m_f->AppendExpList(NumHomogeneousDir);
        }

        for (j = 0; j < nfields; ++j)
        {
            for (int k = 0; k < fromField[i]->m_data.size(); ++k)
            {
                fromField[i]->m_exp[j]->ExtractDataToCoeffs(
                    fromField[i]->m_fielddef[k], fromField[i]->m_data[k],
                    fromField[i]->m_fielddef[k]->m_fields[j],
                    fromField[i]->m_exp[j]->UpdateCoeffs());
            }
            fromField[i]->m_exp[j]->BwdTrans(
                fromField[i]->m_exp[j]->GetCoeffs(),
                fromField[i]->m_exp[j]->UpdatePhys());
        }
    }

    int spacedim = m_f->m_graph->GetSpaceDimension();
    if ((fromField[0]->m_fielddef[0]->m_numHomogeneousDir) == 1 ||
        (fromField[0]->m_fielddef[0]->m_numHomogeneousDir) == 2)
    {
        spacedim = 3;
    }

    int nout = 5; // TAWSS, OSI, transWSS, AFI, CFI (optional WSSG)
    if (wssg)
    {
        nout = 6;
    }

    int npoints = fromField[0]->m_exp[0]->GetNpoints();
    Array<OneD, Array<OneD, NekDouble> > normTemporalMeanVec(spacedim),
        normCrossDir(spacedim), outfield(nout), dtemp(spacedim);
    Array<OneD, NekDouble> TemporalMeanMag(npoints, 0.0),
        DotProduct(npoints, 0.0), temp(npoints, 0.0);

    for (i = 0; i < spacedim; ++i)
    {
        normTemporalMeanVec[i] = Array<OneD, NekDouble>(npoints);
        normCrossDir[i]        = Array<OneD, NekDouble>(npoints);
        dtemp[i]               = Array<OneD, NekDouble>(npoints);
        Vmath::Zero(npoints, normTemporalMeanVec[i], 1);
        Vmath::Zero(npoints, normCrossDir[i], 1);
    }

    for (i = 0; i < nout; ++i)
    {
        outfield[i] = Array<OneD, NekDouble>(npoints, 0.0);
    }

    // -----------------------------------------------------
    // Compute temporal average wall shear stress vector,
    // it's spatial average, and normalise it.
    for (i = 0; i < nfld; ++i)
    {
        for (j = 0; j < spacedim; ++j)
        {
            Vmath::Vadd(npoints, fromField[i]->m_exp[j]->GetPhys(), 1,
                        normTemporalMeanVec[j], 1, normTemporalMeanVec[j], 1);
        }
    }

    for (i = 0; i < spacedim; ++i)
    {
        Vmath::Smul(npoints, 1.0 / nfld, normTemporalMeanVec[i], 1,
                    normTemporalMeanVec[i], 1);
        Vmath::Vvtvp(npoints, normTemporalMeanVec[i], 1, normTemporalMeanVec[i],
                     1, TemporalMeanMag, 1, TemporalMeanMag, 1);
    }

    Vmath::Vsqrt(npoints, TemporalMeanMag, 1, TemporalMeanMag, 1);

    for (i = 0; i < spacedim; ++i)
    {
        Vmath::Vdiv(npoints, normTemporalMeanVec[i], 1, TemporalMeanMag, 1,
                    normTemporalMeanVec[i], 1);
    }
    //---------------------------------------------------

    if (wssg) // cross product with normals to obtain direction parallel to
              // temporal mean vector.
    {
        Vmath::Vmul(npoints, fromField[0]->m_exp[nfields - 1]->GetPhys(), 1,
                    normTemporalMeanVec[1], 1, normCrossDir[0], 1);
        Vmath::Vvtvm(npoints, fromField[0]->m_exp[nfields - 2]->GetPhys(), 1,
                     normTemporalMeanVec[2], 1, normCrossDir[0], 1,
                     normCrossDir[0], 1);

        Vmath::Vmul(npoints, fromField[0]->m_exp[nfields - 3]->GetPhys(), 1,
                    normTemporalMeanVec[2], 1, normCrossDir[1], 1);
        Vmath::Vvtvm(npoints, fromField[0]->m_exp[nfields - 1]->GetPhys(), 1,
                     normTemporalMeanVec[0], 1, normCrossDir[1], 1,
                     normCrossDir[1], 1);

        Vmath::Vmul(npoints, fromField[0]->m_exp[nfields - 2]->GetPhys(), 1,
                    normTemporalMeanVec[0], 1, normCrossDir[2], 1);
        Vmath::Vvtvm(npoints, fromField[0]->m_exp[nfields - 3]->GetPhys(), 1,
                     normTemporalMeanVec[1], 1, normCrossDir[2], 1,
                     normCrossDir[2], 1);
    }

    // Compute tawss, trs,  osi, taafi, tacfi, WSSG.
    for (i = 0; i < nfld; ++i)
    {
        for (j = 0; j < spacedim; ++j)
        {
            Vmath::Vvtvp(npoints, fromField[i]->m_exp[j]->GetPhys(), 1,
                         normTemporalMeanVec[j], 1, DotProduct, 1, DotProduct,
                         1);
        }

        // TAWSS
        Vmath::Vadd(npoints, fromField[i]->m_exp[spacedim]->GetPhys(), 1,
                    outfield[0], 1, outfield[0], 1);

        // transWSS
        Vmath::Vmul(npoints, DotProduct, 1, DotProduct, 1, temp, 1);
        Vmath::Vvtvm(npoints, fromField[i]->m_exp[spacedim]->GetPhys(), 1,
                     fromField[i]->m_exp[spacedim]->GetPhys(), 1, temp, 1,
                     temp, 1);

        for (j = 0; j < npoints; ++j)
        {
            if (temp[j] > 0.0)
            {
                outfield[1][j] = outfield[1][j] + sqrt(temp[j]);
            }
        }

        // TAAFI
        Vmath::Vdiv(npoints, DotProduct, 1,
                    fromField[i]->m_exp[spacedim]->GetPhys(), 1, temp, 1);
        Vmath::Vadd(npoints, temp, 1, outfield[3], 1, outfield[3], 1);

        // TACFI
        for (j = 0; j < npoints; ++j)
        {
            temp[j] = 1 - temp[j] * temp[j];
            if (temp[j] > 0.0)
            {
                outfield[4][j] = outfield[4][j] + sqrt(temp[j]);
            }
        }

        // WSSG
        if (wssg)
        {
            // parallel component:
            Vmath::Zero(npoints, temp, 1);

            fromField[i]->m_exp[0]->PhysDeriv(DotProduct, dtemp[0], dtemp[1],
                                                dtemp[2]);
            for (j = 0; j < spacedim; j++)
            {
                Vmath::Vvtvp(npoints, dtemp[j], 1, normTemporalMeanVec[j], 1,
                             temp, 1, temp, 1);
            }
            Vmath::Vmul(npoints, temp, 1, temp, 1, temp, 1);

            // perpendicular component:
            Vmath::Zero(npoints, DotProduct, 1);

            for (j = 0; j < spacedim; ++j)
            {
                Vmath::Vvtvp(npoints, fromField[i]->m_exp[j]->GetPhys(), 1,
                             normCrossDir[j], 1, DotProduct, 1, DotProduct, 1);
            }
            fromField[i]->m_exp[0]->PhysDeriv(DotProduct, dtemp[0], dtemp[1],
                                                dtemp[2]);
            Vmath::Zero(npoints, DotProduct, 1);

            for (j = 0; j < spacedim; j++)
            {
                Vmath::Vvtvp(npoints, dtemp[j], 1, normCrossDir[j], 1,
                             DotProduct, 1, DotProduct, 1);
            }
            Vmath::Vvtvp(npoints, DotProduct, 1, DotProduct, 1, temp, 1, temp,
                         1);

            // Final wssg computation
            Vmath::Vsqrt(npoints, temp, 1, temp, 1);
            Vmath::Vadd(npoints, temp, 1, outfield[5], 1, outfield[5], 1);
        }

        Vmath::Zero(npoints, DotProduct, 1);
    }

    // Divide by nfld
    Vmath::Smul(npoints, 1.0 / nfld, outfield[0], 1, outfield[0], 1);
    Vmath::Smul(npoints, 1.0 / nfld, outfield[1], 1, outfield[1], 1);
    Vmath::Smul(npoints, 1.0 / nfld, outfield[3], 1, outfield[3], 1);
    Vmath::Smul(npoints, 1.0 / nfld, outfield[4], 1, outfield[4], 1);

    // OSI
    for (i = 0; i < npoints; ++i)
    {
        outfield[2][i] = 0.5 * (1 - TemporalMeanMag[i] / outfield[0][i]);
    }

    /* TAWSS = sum(wss)/nfld
     * transWSS = sum( sqrt( wss^2 - (wss . normTempMean)^2) )/nfld.
     * OSI = 0.5*(1-TemporalMeanMag/TAWSS)
     * TAAFI = sum(cos)/nfld
     * TACFI = sum(sin)/nfld = sum( sqrt(1-cos^2) )/nfld.
     */

    m_f->m_exp.resize(nout);
    m_f->m_fielddef = fromField[0]->m_fielddef;
    m_f->m_exp[0] =
        m_f->SetUpFirstExpList(m_f->m_fielddef[0]->m_numHomogeneousDir, true);

    for (i = 1; i < nout; ++i)
    {
        m_f->m_exp[i] =
            m_f->AppendExpList(m_f->m_fielddef[0]->m_numHomogeneousDir);
    }

    m_f->m_fielddef[0]->m_fields.resize(nout);
    m_f->m_fielddef[0]->m_fields[0] = "TAWSS";
    m_f->m_fielddef[0]->m_fields[1] = "transWSS";
    m_f->m_fielddef[0]->m_fields[2] = "OSI";
    m_f->m_fielddef[0]->m_fields[3] = "TAAFI";
    m_f->m_fielddef[0]->m_fields[4] = "TACFI";

    if (wssg)
    {
        m_f->m_fielddef[0]->m_fields[5] = "|WSSG|";
        Vmath::Smul(npoints, 1.0 / nfld, outfield[5], 1, outfield[5], 1);
    }

    m_f->m_variables = m_f->m_fielddef[0]->m_fields;

    for (i = 0; i < nout; ++i)
    {
        m_f->m_exp[i]->FwdTrans(outfield[i], m_f->m_exp[i]->UpdateCoeffs());
        m_f->m_exp[i]->BwdTrans(m_f->m_exp[i]->GetCoeffs(),
                                m_f->m_exp[i]->UpdatePhys());
    }
}

Member Data Documentation

className

ModuleKey Nektar::FieldUtils::ProcessMultiShear::className

static

Initial value:

=
    GetModuleFactory().RegisterCreatorFunction(
        ModuleKey(eProcessModule, "shear"),
        ProcessMultiShear::create,
        "Computes shear stress metrics.")

Definition at line 57 of file ProcessMultiShear.h.