Nektar::FieldUtils::ProcessScalGrad Class Reference

This processing module calculates the scalar gradient field and writes it to a surface output file. More...

#include <ProcessScalGrad.h>

Inheritance diagram for Nektar::FieldUtils::ProcessScalGrad:

Collaboration diagram for Nektar::FieldUtils::ProcessScalGrad:

Public Member Functions
	ProcessScalGrad (FieldSharedPtr f)
virtual	~ProcessScalGrad ()
virtual void	Process (po::variables_map &vm)
	Write mesh to output file. More...
virtual std::string	GetModuleName ()
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 (string key, 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 bool	GetRequireEquiSpaced (void)
FIELD_UTILS_EXPORT void	SetRequireEquiSpaced (bool pVal)
FIELD_UTILS_EXPORT void	EvaluateTriFieldAtEquiSpacedPts (LocalRegions::ExpansionSharedPtr &exp, const Array< OneD, const NekDouble > &infield, Array< OneD, NekDouble > &outfield)

Static Public Member Functions
static boost::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...
map< string, ConfigOption >	m_config
	List of configuration values. More...
bool	m_requireEquiSpaced

Detailed Description

This processing module calculates the scalar gradient field and writes it to a surface output file.

Definition at line 50 of file ProcessScalGrad.h.

Constructor & Destructor Documentation

Nektar::FieldUtils::ProcessScalGrad::ProcessScalGrad

(

FieldSharedPtr

f

)

Definition at line 57 of file ProcessScalGrad.cpp.

References Nektar::FieldUtils::Module::m_config, and Nektar::FieldUtils::Module::m_f.

                                                 : ProcessModule(f)
{
    m_config["bnd"]  = ConfigOption(false, "All", "Boundary to be extracted");
    f->m_writeBndFld = true;
    f->m_declareExpansionAsContField = true;
    m_f->m_fldToBnd                  = false;
}

Nektar::FieldUtils::ProcessScalGrad::~ProcessScalGrad ( )

virtual

Definition at line 65 of file ProcessScalGrad.cpp.

{
}

Member Function Documentation

static boost::shared_ptr<Module> Nektar::FieldUtils::ProcessScalGrad::create ( FieldSharedPtr  f )

inlinestatic

Creates an instance of this class.

Definition at line 54 of file ProcessScalGrad.h.

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

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

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

inlinevirtual

Implements Nektar::FieldUtils::Module.

Definition at line 66 of file ProcessScalGrad.h.

    {
        return "ProcessScalGrad";
    }

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

virtual

Write mesh to output file.

Implements Nektar::FieldUtils::Module.

Definition at line 69 of file ProcessScalGrad.cpp.

References ASSERTL0, Nektar::SpatialDomains::eDeformed, Nektar::ParseUtils::GenerateOrderedVector(), Nektar::StdRegions::StdExpansion::GetTotPoints(), Nektar::FieldUtils::Module::m_config, Nektar::FieldUtils::Module::m_f, Vmath::Svtvp(), Vmath::Vvtvp(), and Vmath::Zero().

{
    if (m_f->m_verbose)
    {
        if (m_f->m_comm->TreatAsRankZero())
        {
            cout << "ProcessScalGrad: Calculating scalar gradient..." << endl;
        }
    }

    int i, j, k;

    // Set up Field options to output boundary fld
    string bvalues = m_config["bnd"].as<string>();

    if (bvalues.compare("All") == 0)
    {
        Array<OneD, const MultiRegions::ExpListSharedPtr> BndExp =
            m_f->m_exp[0]->GetBndCondExpansions();

        for (i = 0; i < BndExp.num_elements(); ++i)
        {
            m_f->m_bndRegionsToWrite.push_back(i);
        }
    }
    else
    {
        ASSERTL0(ParseUtils::GenerateOrderedVector(bvalues.c_str(),
                                                   m_f->m_bndRegionsToWrite),
                 "Failed to interpret range string");
    }

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

    int nfields = m_f->m_fielddef[0]->m_fields.size();
    // ASSERTL0(nfields == 1,"Implicit assumption that input is in ADR format of
    // (u)");

    if (spacedim == 1)
    {
        ASSERTL0(false, "Error: scalar gradient for a 1D problem cannot "
                        "be computed");
    }

    int ngrad = spacedim;
    int n, cnt, elmtid, nq, offset, boundary, nfq;
    int npoints = m_f->m_exp[0]->GetNpoints();
    string var;
    Array<OneD, NekDouble> scalar;
    Array<OneD, Array<OneD, NekDouble> > grad(ngrad), fgrad(ngrad),
        outfield(nfields);

    StdRegions::StdExpansionSharedPtr elmt;
    StdRegions::StdExpansion2DSharedPtr bc;
    Array<OneD, int> BoundarytoElmtID, BoundarytoTraceID;
    Array<OneD, Array<OneD, MultiRegions::ExpListSharedPtr> > BndExp(nfields);

    m_f->m_exp[0]->GetBoundaryToElmtMap(BoundarytoElmtID, BoundarytoTraceID);

    for (i = 0; i < nfields; i++)
    {
        var = m_f->m_fielddef[0]->m_fields[i];
        stringstream filename;
        filename << var << "_scalar_gradient";
        filename >> var;
        m_f->m_fielddef[0]->m_fields[i] = var;

        BndExp[i]   = m_f->m_exp[i]->GetBndCondExpansions();
        outfield[i] = Array<OneD, NekDouble>(npoints);
    }

    // loop over the types of boundary conditions
    for (cnt = n = 0; n < BndExp[0].num_elements(); ++n)
    {
        bool doneBnd = false;
        // identify if boundary has been defined
        for (int b = 0; b < m_f->m_bndRegionsToWrite.size(); ++b)
        {
            if (n == m_f->m_bndRegionsToWrite[b])
            {
                doneBnd = true;
                for (i = 0; i < BndExp[0][n]->GetExpSize(); ++i, cnt++)
                {
                    // find element and face of this expansion.
                    elmtid = BoundarytoElmtID[cnt];
                    elmt   = m_f->m_exp[0]->GetExp(elmtid);
                    nq     = elmt->GetTotPoints();
                    offset = m_f->m_exp[0]->GetPhys_Offset(elmtid);

                    // Initialise local arrays for the velocity gradients, and
                    // stress components
                    // size of total number of quadrature points for each
                    // element (hence local).
                    for (j = 0; j < ngrad; ++j)
                    {
                        grad[j] = Array<OneD, NekDouble>(nq);
                    }

                    if (spacedim == 2)
                    {
                        // Not implemented in 2D.
                    }
                    else
                    {
                        for (j = 0; j < nfields; j++)
                        {
                            outfield[j] = BndExp[j][n]->UpdateCoeffs() +
                                          BndExp[j][n]->GetCoeff_Offset(i);
                        }

                        // Get face 2D expansion from element expansion
                        bc = boost::dynamic_pointer_cast<
                            StdRegions::StdExpansion2D>(
                            BndExp[0][n]->GetExp(i));
                        nfq = bc->GetTotPoints();

                        // identify boundary of element looking at.
                        boundary = BoundarytoTraceID[cnt];

                        // Get face normals
                        const SpatialDomains::GeomFactorsSharedPtr
                            m_metricinfo = bc->GetMetricInfo();

                        const Array<OneD, const Array<OneD, NekDouble> >
                            normals = elmt->GetFaceNormal(boundary);

                        // initialise arrays
                        for (j = 0; j < ngrad; ++j)
                        {
                            fgrad[j] = Array<OneD, NekDouble>(nfq);
                        }
                        Array<OneD, NekDouble> gradnorm(nfq);

                        for (k = 0; k < nfields; k++)
                        {
                            Vmath::Zero(nfq, gradnorm, 1);

                            scalar = m_f->m_exp[k]->GetPhys() + offset;
                            elmt->PhysDeriv(scalar, grad[0], grad[1], grad[2]);

                            for (j = 0; j < ngrad; ++j)
                            {
                                elmt->GetFacePhysVals(boundary, bc, grad[j],
                                                      fgrad[j]);
                            }

                            // surface curved
                            if (m_metricinfo->GetGtype() ==
                                SpatialDomains::eDeformed)
                            {
                                for (j = 0; j < ngrad; j++)
                                {
                                    Vmath::Vvtvp(nfq, normals[j], 1, fgrad[j],
                                                 1, gradnorm, 1, gradnorm, 1);
                                }
                            }
                            else
                            {
                                for (j = 0; j < ngrad; j++)
                                {
                                    Vmath::Svtvp(nfq, normals[j][0], fgrad[j],
                                                 1, gradnorm, 1, gradnorm, 1);
                                }
                            }
                            bc->FwdTrans(gradnorm, outfield[k]);
                        }
                    }
                }
            }
        }
        if (doneBnd == false)
        {
            cnt += BndExp[0][n]->GetExpSize();
        }
    }

    for (j = 0; j < nfields; ++j)
    {
        for (int b = 0; b < m_f->m_bndRegionsToWrite.size(); ++b)
        {
            m_f->m_exp[j]->UpdateBndCondExpansion(m_f->m_bndRegionsToWrite[b]) =
                BndExp[j][m_f->m_bndRegionsToWrite[b]];
        }
    }
}

Member Data Documentation

ModuleKey Nektar::FieldUtils::ProcessScalGrad::className

static

Initial value:

=
    GetModuleFactory().RegisterCreatorFunction(
        ModuleKey(eProcessModule, "scalargrad"),
        ProcessScalGrad::create,
        "Computes scalar gradient field.")

Definition at line 58 of file ProcessScalGrad.h.