Nektar::PressureOutflowBC Class Reference

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

#include <PressureOutflowBC.h>

Inheritance diagram for Nektar::PressureOutflowBC:

Collaboration 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
virtual void	v_Apply (Array< OneD, Array< OneD, NekDouble > > &Fwd, Array< OneD, Array< OneD, NekDouble > > &physarray, const NekDouble &time)
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...

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)
virtual	~PressureOutflowBC (void)

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...
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_gamma
	Parameters of the flow. More...
NekDouble	m_rhoInf
NekDouble	m_pInf
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 49 of file PressureOutflowBC.h.

Constructor & Destructor Documentation

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 48 of file PressureOutflowBC.cpp.

    : CFSBndCond(pSession, pFields, pTraceNormals, pSpaceDim, bcRegion, cnt)
{
}

virtual Nektar::PressureOutflowBC::~PressureOutflowBC ( void  )

inlineprivatevirtual

Definition at line 86 of file PressureOutflowBC.h.

{};

Member Function Documentation

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 56 of file PressureOutflowBC.h.

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

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

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

protectedvirtual

Implements Nektar::CFSBndCond.

Definition at line 59 of file PressureOutflowBC.cpp.

References Nektar::CFSBndCond::m_bcRegion, Nektar::CFSBndCond::m_fields, Nektar::CFSBndCond::m_gamma, Nektar::CFSBndCond::m_offset, Nektar::CFSBndCond::m_pInf, Nektar::CFSBndCond::m_spacedim, Nektar::CFSBndCond::m_traceNormals, Nektar::CFSBndCond::m_varConv, npts, Vmath::Vabs(), Vmath::Vdiv(), and Vmath::Vvtvp().

{
    int i, j;
    int nTracePts = m_fields[0]->GetTrace()->GetNpoints();
    int nVariables = physarray.num_elements();
    int nDimensions = m_spacedim;

    const Array<OneD, const int> &traceBndMap
    = m_fields[0]->GetTraceBndMap();

    NekDouble gammaMinusOne    = m_gamma - 1.0;
    NekDouble gammaMinusOneInv = 1.0 / gammaMinusOne;

    // 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 > pressure  (nTracePts);
    Array<OneD, NekDouble > soundSpeed(nTracePts);

    m_varConv->GetPressure(Fwd, pressure);
    m_varConv->GetSoundSpeed(Fwd, pressure, 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]);

        // 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 = m_pInf * gammaMinusOneInv + 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];
                }
            }
        }
    }
}

Friends And Related Function Documentation

friend class MemoryManager< PressureOutflowBC >

friend

Definition at line 53 of file PressureOutflowBC.h.

Member Data Documentation

std::string Nektar::PressureOutflowBC::className

static

Initial value:

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

Name of the class.

Definition at line 69 of file PressureOutflowBC.h.