Nektar::FieldUtils::ProcessVelocityDivergence Class Reference

This processing module calculates the divergence of the velocity field and adds it as an extra-field to the output file. More...

#include <ProcessVelocityDivergence.h>

Inheritance diagram for Nektar::FieldUtils::ProcessVelocityDivergence:

Public Member Functions
	ProcessVelocityDivergence (FieldSharedPtr f)
	~ProcessVelocityDivergence () override
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)
virtual	~Module ()=default
void	Process (po::variables_map &vm)
std::string	GetModuleName ()
std::string	GetModuleDescription ()
const ConfigOption &	GetConfigOption (const std::string &key) const
ModulePriority	GetModulePriority ()
std::vector< ModuleKey >	GetModulePrerequisites ()
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	AddFile (std::string fileType, std::string fileName)
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

Protected Member Functions
void	v_Process (po::variables_map &vm) override
	Write mesh to output file. More...
std::string	v_GetModuleName () override
std::string	v_GetModuleDescription () override
ModulePriority	v_GetModulePriority () override
void	GetVelocity (Array< OneD, Array< OneD, NekDouble > > &vel, int strip=0)
Protected Member Functions inherited from Nektar::FieldUtils::Module
	Module ()
virtual void	v_Process (po::variables_map &vm)
virtual std::string	v_GetModuleName ()
virtual std::string	v_GetModuleDescription ()
virtual ModulePriority	v_GetModulePriority ()
virtual std::vector< ModuleKey >	v_GetModulePrerequisites ()

Private Attributes
int	m_spacedim

Additional Inherited Members
Public Attributes inherited from Nektar::FieldUtils::Module
FieldSharedPtr	m_f
	Field object. More...
Protected Attributes inherited from Nektar::FieldUtils::Module
std::map< std::string, ConfigOption >	m_config
	List of configuration values. More...
std::set< std::string >	m_allowedFiles
	List of allowed file formats. More...

Detailed Description

This processing module calculates the divergence of the velocity field and adds it as an extra-field to the output file.

Definition at line 46 of file ProcessVelocityDivergence.h.

Constructor & Destructor Documentation

ProcessVelocityDivergence()

Nektar::FieldUtils::ProcessVelocityDivergence::ProcessVelocityDivergence

(

FieldSharedPtr

f

)

Definition at line 54 of file ProcessVelocityDivergence.cpp.

    : ProcessModule(f)
{
}

~ProcessVelocityDivergence()

Nektar::FieldUtils::ProcessVelocityDivergence::~ProcessVelocityDivergence ( )

override

Definition at line 59 of file ProcessVelocityDivergence.cpp.

{
}

Member Function Documentation

create()

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

inlinestatic

Creates an instance of this class.

Definition at line 50 of file ProcessVelocityDivergence.h.

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

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

GetVelocity()

void Nektar::FieldUtils::ProcessVelocityDivergence::GetVelocity ( Array< OneD, Array< OneD, NekDouble > > &  vel, int  strip = 0  )

protected

Definition at line 195 of file ProcessVelocityDivergence.cpp.

{
    int nfields = m_f->m_variables.size();
    int npoints = m_f->m_exp[0]->GetNpoints();
    if (boost::iequals(m_f->m_variables[0], "u"))
    {
        // IncNavierStokesSolver
        for (int i = 0; i < m_spacedim; ++i)
        {
            vel[i] = Array<OneD, NekDouble>(npoints);
            Vmath::Vcopy(npoints, m_f->m_exp[strip * nfields + i]->GetPhys(), 1,
                         vel[i], 1);
        }
    }
    else if (boost::iequals(m_f->m_variables[0], "rho") &&
             boost::iequals(m_f->m_variables[1], "rhou"))
    {
        // CompressibleFlowSolver
        for (int i = 0; i < m_spacedim; ++i)
        {
            vel[i] = Array<OneD, NekDouble>(npoints);
            Vmath::Vdiv(npoints, m_f->m_exp[strip * nfields + i + 1]->GetPhys(),
                        1, m_f->m_exp[strip * nfields + 0]->GetPhys(), 1,
                        vel[i], 1);
        }
    }
    else
    {
        // Unknown
        ASSERTL0(false,
                 "Could not identify velocity for ProcessVelocityDivergence");
    }
}

References ASSERTL0, Nektar::FieldUtils::Module::m_f, m_spacedim, Vmath::Vcopy(), and Vmath::Vdiv().

Referenced by v_Process().

v_GetModuleDescription()

std::string Nektar::FieldUtils::ProcessVelocityDivergence::v_GetModuleDescription ( )

inlineoverrideprotectedvirtual

Reimplemented from Nektar::FieldUtils::Module.

Definition at line 68 of file ProcessVelocityDivergence.h.

    {
        return "Calculating velocity divergence";
    }

v_GetModuleName()

std::string Nektar::FieldUtils::ProcessVelocityDivergence::v_GetModuleName ( )

inlineoverrideprotectedvirtual

Reimplemented from Nektar::FieldUtils::Module.

Definition at line 63 of file ProcessVelocityDivergence.h.

    {
        return "ProcessVelocityDivergence";
    }

v_GetModulePriority()

ModulePriority Nektar::FieldUtils::ProcessVelocityDivergence::v_GetModulePriority ( )

inlineoverrideprotectedvirtual

Reimplemented from Nektar::FieldUtils::Module.

Definition at line 73 of file ProcessVelocityDivergence.h.

    {
        return eModifyExp;
    }

References Nektar::FieldUtils::eModifyExp.

v_Process()

void Nektar::FieldUtils::ProcessVelocityDivergence::v_Process ( po::variables_map &  vm )

overrideprotectedvirtual

Write mesh to output file.

Reimplemented from Nektar::FieldUtils::Module.

Definition at line 63 of file ProcessVelocityDivergence.cpp.

{
    m_f->SetUpExp(vm);
 
    int i, s;
    int expdim = m_f->m_graph->GetMeshDimension();
    m_spacedim = expdim;
    if ((m_f->m_numHomogeneousDir) == 1 || (m_f->m_numHomogeneousDir) == 2)
    {
        m_spacedim = 3;
    }
    int nfields = m_f->m_variables.size();
    ASSERTL0(m_spacedim != 1,
             "Error: Divergence for a 1D problem cannot be computed");
 
    // Append field names
    m_f->m_variables.push_back("divV");
 
    // Skip in case of empty partition
    if (m_f->m_exp[0]->GetNumElmts() == 0)
    {
        return;
    }
    int npoints = m_f->m_exp[0]->GetNpoints();
    Array<OneD, Array<OneD, NekDouble>> grad(m_spacedim * m_spacedim);
    Array<OneD, Array<OneD, NekDouble>> outfield(1);
 
    int nstrips;
 
    m_f->m_session->LoadParameter("Strip_Z", nstrips, 1);
 
    for (i = 0; i < m_spacedim * m_spacedim; ++i)
    {
        grad[i] = Array<OneD, NekDouble>(npoints);
    }
 
    outfield[0] = Array<OneD, NekDouble>(npoints);
 
    Array<OneD, Array<OneD, NekDouble>> tmp(m_spacedim);
    for (int i = 0; i < m_spacedim; i++)
    {
        tmp[i] = Array<OneD, NekDouble>(npoints);
    }
 
    vector<MultiRegions::ExpListSharedPtr> Exp(nstrips);
 
    // Get mapping
    GlobalMapping::MappingSharedPtr mapping = ProcessMapping::GetMapping(m_f);
 
    for (s = 0; s < nstrips; ++s) // homogeneous strip varient
    {
        // Get velocity and convert to Cartesian system,
        //      if it is still in transformed system
        Array<OneD, Array<OneD, NekDouble>> vel(m_spacedim);
        GetVelocity(vel, s);
        if (m_f->m_fieldMetaDataMap.count("MappingCartesianVel"))
        {
            if (m_f->m_fieldMetaDataMap["MappingCartesianVel"] == "False")
            {
                // Initialize arrays and copy velocity
                if (m_f->m_exp[0]->GetWaveSpace())
                {
                    for (int i = 0; i < m_spacedim; ++i)
                    {
                        m_f->m_exp[0]->HomogeneousBwdTrans(npoints, vel[i],
                                                           vel[i]);
                    }
                }
                // Convert velocity to cartesian system
                mapping->ContravarToCartesian(vel, vel);
                // Convert back to wavespace if necessary
                if (m_f->m_exp[0]->GetWaveSpace())
                {
                    for (int i = 0; i < m_spacedim; ++i)
                    {
                        m_f->m_exp[0]->HomogeneousFwdTrans(npoints, vel[i],
                                                           vel[i]);
                    }
                }
            }
        }
 
        // Calculate Gradient
        if (m_spacedim == 2)
        {
            for (i = 0; i < m_spacedim; ++i)
            {
                m_f->m_exp[s * nfields + i]->PhysDeriv(vel[i], tmp[0], tmp[1]);
                mapping->CovarToCartesian(tmp, tmp);
                for (int j = 0; j < m_spacedim; j++)
                {
                    Vmath::Vcopy(npoints, tmp[j], 1, grad[i * m_spacedim + j],
                                 1);
                }
            }
            // diV = Ux + Vy
            Vmath::Vadd(npoints, grad[0 * m_spacedim + 0], 1,
                        grad[1 * m_spacedim + 1], 1, outfield[0], 1);
        }
        else
        {
            for (i = 0; i < m_spacedim; ++i)
            {
                m_f->m_exp[s * nfields + i]->PhysDeriv(vel[i], tmp[0], tmp[1],
                                                       tmp[2]);
                mapping->CovarToCartesian(tmp, tmp);
                for (int j = 0; j < m_spacedim; j++)
                {
                    Vmath::Vcopy(npoints, tmp[j], 1, grad[i * m_spacedim + j],
                                 1);
                }
            }
 
            // diV = Ux + Vy + Wz
            Vmath::Vadd(npoints, grad[0 * m_spacedim + 0], 1,
                        grad[1 * m_spacedim + 1], 1, outfield[0], 1);
            Vmath::Vadd(npoints, outfield[0], 1, grad[2 * m_spacedim + 2], 1,
                        outfield[0], 1);
        }
 
        Exp[s] = m_f->AppendExpList(m_f->m_numHomogeneousDir);
        Vmath::Vcopy(npoints, outfield[0], 1, Exp[s]->UpdatePhys(), 1);
        Exp[s]->FwdTransLocalElmt(outfield[0], Exp[s]->UpdateCoeffs());
    }
 
    for (s = 0; s < nstrips; ++s)
    {
        m_f->m_exp.insert(m_f->m_exp.begin() + s * (nfields + 1) + nfields,
                          Exp[s]);
    }
}

References ASSERTL0, Nektar::FieldUtils::ProcessMapping::GetMapping(), GetVelocity(), Nektar::FieldUtils::Module::m_f, m_spacedim, Nektar::GlobalMapping::MappingSharedPtr, Vmath::Vadd(), and Vmath::Vcopy().

Member Data Documentation

className

ModuleKey Nektar::FieldUtils::ProcessVelocityDivergence::className

static

Initial value:

=
    GetModuleFactory().RegisterCreatorFunction(
        ModuleKey(eProcessModule, "divergence"),
        ProcessVelocityDivergence::create,
        "Computes divergence of the velocity field.")

Definition at line 54 of file ProcessVelocityDivergence.h.

m_spacedim

int Nektar::FieldUtils::ProcessVelocityDivergence::m_spacedim

private

Definition at line 81 of file ProcessVelocityDivergence.h.

Referenced by GetVelocity(), and v_Process().