Nektar::PressureOutflowBC Class Reference

Pressure outflow boundary conditions for compressible flow problems. More...

#include <PressureOutflowBC.h>

Inheritance diagram for Nektar::PressureOutflowBC:

Static Public Member Functions
static CFSBndCondSharedPtr	create (const LibUtilities::SessionReaderSharedPtr &pSession, const Array< OneD, MultiRegions::ExpListSharedPtr > &pFields, const Array< OneD, Array< OneD, NekDouble > > &pTraceNormals, const int pSpaceDim, const int bcRegion, const int cnt)
	Creates an instance of this class. More...

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

Protected Member Functions
void	v_Apply (Array< OneD, Array< OneD, NekDouble > > &Fwd, Array< OneD, Array< OneD, NekDouble > > &physarray, const NekDouble &time) override
Protected Member Functions inherited from Nektar::CFSBndCond
	CFSBndCond (const LibUtilities::SessionReaderSharedPtr &pSession, const Array< OneD, MultiRegions::ExpListSharedPtr > &pFields, const Array< OneD, Array< OneD, NekDouble > > &pTraceNormals, const int pSpaceDim, const int bcRegion, const int cnt)
	Constructor. More...
virtual void	v_Apply (Array< OneD, Array< OneD, NekDouble > > &Fwd, Array< OneD, Array< OneD, NekDouble > > &physarray, const NekDouble &time)=0
virtual void	v_ApplyBwdWeight ()

Private Member Functions
	PressureOutflowBC (const LibUtilities::SessionReaderSharedPtr &pSession, const Array< OneD, MultiRegions::ExpListSharedPtr > &pFields, const Array< OneD, Array< OneD, NekDouble > > &pTraceNormals, const int pSpaceDim, const int bcRegion, const int cnt)
	~PressureOutflowBC (void) override

Private Attributes
Array< OneD, NekDouble >	m_pressureStorage

Friends
class	MemoryManager< PressureOutflowBC >

Additional Inherited Members
Public Member Functions inherited from Nektar::CFSBndCond
virtual	~CFSBndCond ()
void	Apply (Array< OneD, Array< OneD, NekDouble > > &Fwd, Array< OneD, Array< OneD, NekDouble > > &physarray, const NekDouble &time=0)
	Apply the boundary condition. More...
void	ApplyBwdWeight ()
	Apply the Weight of boundary condition. More...
Protected Attributes inherited from Nektar::CFSBndCond
LibUtilities::SessionReaderSharedPtr	m_session
	Session reader. More...
Array< OneD, MultiRegions::ExpListSharedPtr >	m_fields
	Array of fields. More...
Array< OneD, Array< OneD, NekDouble > >	m_traceNormals
	Trace normals. More...
int	m_spacedim
	Space dimension. More...
VariableConverterSharedPtr	m_varConv
	Auxiliary object to convert variables. More...
NekDouble	m_diffusionAveWeight
	Weight for average calculation of diffusion term. More...
NekDouble	m_gamma
	Parameters of the flow. More...
NekDouble	m_rhoInf
NekDouble	m_pInf
NekDouble	m_pOut
Array< OneD, NekDouble >	m_velInf
int	m_bcRegion
	Id of the boundary region. More...
int	m_offset
	Offset. More...

Detailed Description

Pressure outflow boundary conditions for compressible flow problems.

Definition at line 47 of file PressureOutflowBC.h.

Constructor & Destructor Documentation

PressureOutflowBC()

Nektar::PressureOutflowBC::PressureOutflowBC ( const LibUtilities::SessionReaderSharedPtr &  pSession, const Array< OneD, MultiRegions::ExpListSharedPtr > &  pFields, const Array< OneD, Array< OneD, NekDouble > > &  pTraceNormals, const int  pSpaceDim, const int  bcRegion, const int  cnt  )

private

Definition at line 47 of file PressureOutflowBC.cpp.

    : CFSBndCond(pSession, pFields, pTraceNormals, pSpaceDim, bcRegion, cnt)
{
    int numBCPts =
        m_fields[0]->GetBndCondExpansions()[m_bcRegion]->GetNpoints();
    m_pressureStorage = Array<OneD, NekDouble>(numBCPts, 0.0);
 
    // Get Pressure
    Vmath::Vcopy(
        numBCPts,
        m_fields[m_spacedim + 1]->GetBndCondExpansions()[m_bcRegion]->GetPhys(),
        1, m_pressureStorage, 1);
}

References Nektar::CFSBndCond::m_bcRegion, Nektar::CFSBndCond::m_fields, m_pressureStorage, Nektar::CFSBndCond::m_spacedim, and Vmath::Vcopy().

~PressureOutflowBC()

Nektar::PressureOutflowBC::~PressureOutflowBC ( void  )

inlineoverrideprivate

Definition at line 80 of file PressureOutflowBC.h.

{};

Member Function Documentation

create()

static CFSBndCondSharedPtr Nektar::PressureOutflowBC::create ( const LibUtilities::SessionReaderSharedPtr &  pSession, const Array< OneD, MultiRegions::ExpListSharedPtr > &  pFields, const Array< OneD, Array< OneD, NekDouble > > &  pTraceNormals, const int  pSpaceDim, const int  bcRegion, const int  cnt  )

inlinestatic

Creates an instance of this class.

Definition at line 53 of file PressureOutflowBC.h.

    {
        CFSBndCondSharedPtr p =
            MemoryManager<PressureOutflowBC>::AllocateSharedPtr(
                pSession, pFields, pTraceNormals, pSpaceDim, bcRegion, cnt);
        return p;
    }

References Nektar::MemoryManager< DataType >::AllocateSharedPtr(), and CellMLToNektar.cellml_metadata::p.

v_Apply()

void Nektar::PressureOutflowBC::v_Apply ( Array< OneD, Array< OneD, NekDouble > > &  Fwd, Array< OneD, Array< OneD, NekDouble > > &  physarray, const NekDouble &  time  )

overrideprotectedvirtual

Implements Nektar::CFSBndCond.

Definition at line 65 of file PressureOutflowBC.cpp.

{
    int i, j;
    int nTracePts   = m_fields[0]->GetTrace()->GetNpoints();
    int nVariables  = physarray.size();
    int nDimensions = m_spacedim;
 
    const Array<OneD, const int> &traceBndMap = m_fields[0]->GetTraceBndMap();
 
    // Computing the normal velocity for characteristics coming
    // from inside the computational domain
    Array<OneD, NekDouble> Vn(nTracePts, 0.0);
    Array<OneD, NekDouble> Vel(nTracePts, 0.0);
    for (i = 0; i < nDimensions; ++i)
    {
        Vmath::Vdiv(nTracePts, Fwd[i + 1], 1, Fwd[0], 1, Vel, 1);
        Vmath::Vvtvp(nTracePts, m_traceNormals[i], 1, Vel, 1, Vn, 1, Vn, 1);
    }
 
    // Computing the absolute value of the velocity in order to compute the
    // Mach number to decide whether supersonic or subsonic
    Array<OneD, NekDouble> absVel(nTracePts, 0.0);
    m_varConv->GetAbsoluteVelocity(Fwd, absVel);
 
    // Get speed of sound
    Array<OneD, NekDouble> soundSpeed(nTracePts);
    m_varConv->GetSoundSpeed(Fwd, soundSpeed);
 
    // Get Mach
    Array<OneD, NekDouble> Mach(nTracePts, 0.0);
    Vmath::Vdiv(nTracePts, Vn, 1, soundSpeed, 1, Mach, 1);
    Vmath::Vabs(nTracePts, Mach, 1, Mach, 1);
 
    // Auxiliary variables
    int e, id1, id2, npts, pnt;
    NekDouble rhoeb;
 
    // Loop on the m_bcRegions
    for (e = 0;
         e < m_fields[0]->GetBndCondExpansions()[m_bcRegion]->GetExpSize(); ++e)
    {
        npts = m_fields[0]
                   ->GetBndCondExpansions()[m_bcRegion]
                   ->GetExp(e)
                   ->GetTotPoints();
        id1 =
            m_fields[0]->GetBndCondExpansions()[m_bcRegion]->GetPhys_Offset(e);
        id2 =
            m_fields[0]->GetTrace()->GetPhys_Offset(traceBndMap[m_offset + e]);
 
        // Get internal energy
        Array<OneD, NekDouble> pressure(npts, m_pressureStorage + id1);
        Array<OneD, NekDouble> rho(npts, Fwd[0] + id2);
        Array<OneD, NekDouble> Ei(npts);
        m_varConv->GetEFromRhoP(rho, pressure, Ei);
 
        // Loop on points of m_bcRegion 'e'
        for (i = 0; i < npts; i++)
        {
            pnt = id2 + i;
 
            // Subsonic flows
            if (Mach[pnt] < 0.99)
            {
                // Kinetic energy calculation
                NekDouble Ek = 0.0;
                for (j = 1; j < nVariables - 1; ++j)
                {
                    Ek += 0.5 * (Fwd[j][pnt] * Fwd[j][pnt]) / Fwd[0][pnt];
                }
 
                rhoeb = Fwd[0][pnt] * Ei[i] + Ek;
 
                // Partial extrapolation for subsonic cases
                for (j = 0; j < nVariables - 1; ++j)
                {
                    (m_fields[j]
                         ->GetBndCondExpansions()[m_bcRegion]
                         ->UpdatePhys())[id1 + i] = Fwd[j][pnt];
                }
 
                (m_fields[nVariables - 1]
                     ->GetBndCondExpansions()[m_bcRegion]
                     ->UpdatePhys())[id1 + i] = rhoeb;
            }
            // Supersonic flows
            else
            {
                for (j = 0; j < nVariables; ++j)
                {
                    // Extrapolation for supersonic cases
                    (m_fields[j]
                         ->GetBndCondExpansions()[m_bcRegion]
                         ->UpdatePhys())[id1 + i] = Fwd[j][pnt];
                }
            }
        }
    }
}

References Nektar::CFSBndCond::m_bcRegion, Nektar::CFSBndCond::m_fields, Nektar::CFSBndCond::m_offset, m_pressureStorage, Nektar::CFSBndCond::m_spacedim, Nektar::CFSBndCond::m_traceNormals, Nektar::CFSBndCond::m_varConv, CG_Iterations::pressure, Vmath::Vabs(), Vmath::Vdiv(), and Vmath::Vvtvp().

Friends And Related Function Documentation

MemoryManager< PressureOutflowBC >

friend class MemoryManager< PressureOutflowBC >

friend

Definition at line 1 of file PressureOutflowBC.h.

Member Data Documentation

className

std::string Nektar::PressureOutflowBC::className

static

Initial value:

=
    GetCFSBndCondFactory().RegisterCreatorFunction(
        "PressureOutflow", PressureOutflowBC::create,
        "Pressure outflow boundary condition.")

Name of the class.

Definition at line 66 of file PressureOutflowBC.h.

m_pressureStorage

Array<OneD, NekDouble> Nektar::PressureOutflowBC::m_pressureStorage

private

Definition at line 83 of file PressureOutflowBC.h.

Referenced by PressureOutflowBC(), and v_Apply().