A 3-dimensional five-faced element (2 triangles, 3 quadrilaterals). More...

#include <MeshElements.h>

Inheritance diagram for Nektar::Utilities::Prism:

Collaboration diagram for Nektar::Utilities::Prism:

Public Member Functions
	Prism (ElmtConfig pConf, std::vector< NodeSharedPtr > pNodeList, std::vector< int > pTagList)
	Create a prism element.
	Prism (const Prism &pSrc)
virtual	~Prism ()
virtual SpatialDomains::GeometrySharedPtr	GetGeom (int coordDim)
	Generate a Nektar++ geometry object for this element.
virtual void	Complete (int order)

Public Member Functions inherited from Nektar::Utilities::Element
	Element (ElmtConfig pConf, unsigned int pNumNodes, unsigned int pGotNodes)
unsigned int	GetId () const
	Returns the ID of the element (or associated edge or face for boundary elements).
unsigned int	GetDim () const
	Returns the expansion dimension of the element.
ElmtConfig	GetConf () const
	Returns the configuration of the element.
std::string	GetTag () const
	Returns the tag which defines the element shape.
NodeSharedPtr	GetVertex (unsigned int i) const
	Access a vertex node.
EdgeSharedPtr	GetEdge (unsigned int i) const
	Access an edge.
FaceSharedPtr	GetFace (unsigned int i) const
	Access a face.
std::vector< NodeSharedPtr >	GetVertexList () const
	Access the list of vertex nodes.
std::vector< EdgeSharedPtr >	GetEdgeList () const
	Access the list of edges.
std::vector< FaceSharedPtr >	GetFaceList () const
	Access the list of faces.
std::vector< NodeSharedPtr >	GetVolumeNodes () const
	Access the list of volume nodes.
void	SetVolumeNodes (std::vector< NodeSharedPtr > &nodes)
LibUtilities::PointsType	GetCurveType () const
void	SetCurveType (LibUtilities::PointsType cT)
unsigned int	GetNodeCount () const
	Returns the total number of nodes (vertices, edge nodes and face nodes and volume nodes).
std::vector< int >	GetTagList () const
	Access the list of tags associated with this element.
unsigned int	GetVertexCount () const
	Returns the number of vertices.
unsigned int	GetEdgeCount () const
	Returns the number of edges.
unsigned int	GetFaceCount () const
	Returns the number of faces.
void	SetId (unsigned int p)
	Change the ID of the element.
void	SetVertex (unsigned int p, NodeSharedPtr pNew)
	Replace a vertex with another vertex object.
void	SetEdge (unsigned int p, EdgeSharedPtr pNew)
	Replace an edge with another edge object.
void	SetFace (unsigned int p, FaceSharedPtr pNew)
	Replace a face with another face object.
void	SetEdgeLink (EdgeSharedPtr pLink)
	Set a correspondence between this element and an edge (2D boundary element).
EdgeSharedPtr	GetEdgeLink ()
	Get correspondence between this element and an edge.
void	SetFaceLink (FaceSharedPtr pLink)
	Set a correspondence between this element and a face (3D boundary element).
FaceSharedPtr	GetFaceLink ()
	Get correspondence between this element and a face.
void	SetBoundaryLink (int i, int j)
	Set a correspondence between edge or face i and its representative boundary element m->element[expDim-1][j].
int	GetBoundaryLink (int i)
	Get the location of the boundary face/edge i for this element.
void	SetTagList (const std::vector< int > &tags)
	Set the list of tags associated with this element.
virtual std::string	GetXmlString () const
	Generate a list of vertices (1D), edges (2D), or faces (3D).
std::vector< NodeSharedPtr >	tensorNodeOrdering (const std::vector< NodeSharedPtr > &nodes, int n) const
	Reorders Gmsh ordered nodes into a row-by-row ordering required for Nektar++ curve tags.
std::string	GetXmlCurveString () const
	Generates a string listing the coordinates of all nodes associated with this element.
int	GetMaxOrder ()
	Obtain the order of an element by looking at edges.
void	Print ()

Static Public Member Functions
static ElementSharedPtr	create (ElmtConfig pConf, std::vector< NodeSharedPtr > pNodeList, std::vector< int > pTagList)
	Creates an instance of this class.
static unsigned int	GetNumNodes (ElmtConfig pConf)
	Return the number of nodes defining a prism.

Public Attributes
unsigned int	m_orientation

Static Public Attributes
static LibUtilities::ShapeType	m_type
	Element type.

Protected Member Functions
void	OrientPrism ()
	Orient prism to align degenerate vertices.

Additional Inherited Members
Protected Attributes inherited from Nektar::Utilities::Element
unsigned int	m_id
	ID of the element.
unsigned int	m_dim
	Dimension of the element.
ElmtConfig	m_conf
	Contains configuration of the element.
std::string	m_tag
	Tag character describing the element.
std::vector< int >	m_taglist
	List of integers specifying properties of the element.
std::vector< NodeSharedPtr >	m_vertex
	List of element vertex nodes.
std::vector< EdgeSharedPtr >	m_edge
	List of element edges.
std::vector< FaceSharedPtr >	m_face
	List of element faces.
std::vector< NodeSharedPtr >	m_volumeNodes
	List of element volume nodes.
LibUtilities::PointsType	m_curveType
	Volume curve type.
EdgeSharedPtr	m_edgeLink
	Pointer to the corresponding edge if element is a 2D boundary.
FaceSharedPtr	m_faceLink
	Pointer to the corresponding face if element is a 3D boundary.
std::map< int, int >	m_boundaryLinks
	Array mapping faces/edges to the location of the appropriate boundary elements in m->element.
SpatialDomains::GeometrySharedPtr	m_geom
	Nektar++ geometry object for this element.

Detailed Description

A 3-dimensional five-faced element (2 triangles, 3 quadrilaterals).

Definition at line 1422 of file MeshElements.h.

Constructor & Destructor Documentation

Nektar::Utilities::Prism::Prism	(	ElmtConfig	pConf,
		std::vector< NodeSharedPtr >	pNodeList,
		std::vector< int >	pTagList
	)

Create a prism element.

Definition at line 1350 of file MeshElements.cpp.

            : Element(pConf, GetNumNodes(pConf), pNodeList.size())
        {
            m_tag     = "R";
            m_dim     = 3;
            m_taglist = pTagList;
            int n     = m_conf.m_order-1;
            // Create a map to relate edge nodes to a pair of vertices
            // defining an edge. This is based on the ordering produced by
            // gmsh.
            map<pair<int,int>, int> edgeNodeMap;
            map<pair<int,int>, int>::iterator it;
            // This edge-node map is based on Nektar++ ordering.
            edgeNodeMap[pair<int,int>(1,2)] = 7;
            edgeNodeMap[pair<int,int>(2,3)] = 7 + n;
            edgeNodeMap[pair<int,int>(4,3)] = 7 + 2*n;
            edgeNodeMap[pair<int,int>(1,4)] = 7 + 3*n;
            edgeNodeMap[pair<int,int>(1,5)] = 7 + 4*n;
            edgeNodeMap[pair<int,int>(2,5)] = 7 + 5*n;
            edgeNodeMap[pair<int,int>(3,6)] = 7 + 6*n;
            edgeNodeMap[pair<int,int>(4,6)] = 7 + 7*n;
            edgeNodeMap[pair<int,int>(5,6)] = 7 + 8*n;
            // Add vertices
            for (int i = 0; i < 6; ++i)
            {
                m_vertex.push_back(pNodeList[i]);
            }
            int eid = 0;
            // Create edges (with corresponding set of edge points)
            for (it = edgeNodeMap.begin(); it != edgeNodeMap.end(); ++it)
            {
                vector<NodeSharedPtr> edgeNodes;
                if (m_conf.m_order > 1) {
                    for (int j = it->second; j < it->second + n; ++j) {
                        edgeNodes.push_back(pNodeList[j-1]);
                    }
                }
                m_edge.push_back(EdgeSharedPtr(
                    new Edge(pNodeList[it->first.first-1],
                             pNodeList[it->first.second-1],
                             edgeNodes,
                             m_conf.m_edgeCurveType)));
                m_edge.back()->m_id = eid++;
            }
            
            if (m_conf.m_reorient)
            {
                OrientPrism();
            }
            
            // Create faces
            int face_ids[5][4] = {
                {0,1,2,3},{0,1,4,-1},{1,2,5,4},{3,2,5,-1},{0,3,5,4}};
            int face_edges[5][4];
            int faceoffset = 0;
            for (int j = 0; j < 5; ++j)
            {
                vector<NodeSharedPtr> faceVertices;
                vector<EdgeSharedPtr> faceEdges;
                vector<NodeSharedPtr> faceNodes;
                int nEdge = 3 - (j % 2 - 1);
                
                for (int k = 0; k < nEdge; ++k)
                {
                    faceVertices.push_back(m_vertex[face_ids[j][k]]);
                    NodeSharedPtr a = m_vertex[face_ids[j][k]];
                    NodeSharedPtr b = m_vertex[face_ids[j][(k+1) % nEdge]];
                    for (unsigned int i = 0; i < m_edge.size(); ++i)
                    {
                        if ((m_edge[i]->m_n1 == a && m_edge[i]->m_n2 == b) || 
                            (m_edge[i]->m_n1 == b && m_edge[i]->m_n2 == a))
                        {
                            faceEdges.push_back(m_edge[i]);
                            face_edges[j][k] = i;
                            break;
                        }
                    }
                }
                
                if (m_conf.m_faceNodes)
                {
                    int facenodes = j%2==0 ? n*n : n*(n-1)/2;
                    faceoffset   += facenodes;
                    int N = 6 + 9*n + faceoffset;
                    for (int i = 0; i < facenodes; ++i)
                    {
                        faceNodes.push_back(pNodeList[N+i]);
                    }
                }
                m_face.push_back(FaceSharedPtr(
                    new Face(faceVertices, faceNodes, faceEdges, m_conf.m_faceCurveType)));
            }
            
            // Re-order edge array to be consistent with Nektar++ ordering.
            vector<EdgeSharedPtr> tmp(9);
            tmp[0] = m_edge[face_edges[0][0]];
            tmp[1] = m_edge[face_edges[0][1]];
            tmp[2] = m_edge[face_edges[0][2]];
            tmp[3] = m_edge[face_edges[0][3]];
            tmp[4] = m_edge[face_edges[1][2]];
            tmp[5] = m_edge[face_edges[1][1]];
            tmp[6] = m_edge[face_edges[2][1]];
            tmp[7] = m_edge[face_edges[3][2]];
            tmp[8] = m_edge[face_edges[4][2]];
            m_edge = tmp;
        }

Nektar::Utilities::Prism::Prism ( const Prism & pSrc )

virtual Nektar::Utilities::Prism::~Prism ( )

inlinevirtual

Definition at line 1446 of file MeshElements.h.

{}

Member Function Documentation

void Nektar::Utilities::Prism::Complete ( int order )

virtual

Reimplemented from Nektar::Utilities::Element.

Definition at line 1496 of file MeshElements.cpp.

References Nektar::LibUtilities::eGaussLobattoLegendre, Nektar::LibUtilities::eGaussRadauMAlpha1Beta0, Nektar::LibUtilities::eNodalPrismEvenlySpaced, Nektar::LibUtilities::eOrtho_A, Nektar::LibUtilities::eOrtho_B, GetGeom(), Nektar::Utilities::Element::m_conf, Nektar::Utilities::Element::m_edge, Nektar::Utilities::Element::m_face, Nektar::Utilities::ElmtConfig::m_faceNodes, Nektar::Utilities::ElmtConfig::m_order, Nektar::Utilities::ElmtConfig::m_volumeNodes, and Nektar::Utilities::Element::m_volumeNodes.

        {
            int i, j, pos;
            
            // Create basis key for a nodal tetrahedron.
            LibUtilities::BasisKey B0(
                LibUtilities::eOrtho_A, order+1,
                LibUtilities::PointsKey(
                    order+1,LibUtilities::eGaussLobattoLegendre));
            LibUtilities::BasisKey B1(
                LibUtilities::eOrtho_A, order+1,
                LibUtilities::PointsKey(
                    order+1,LibUtilities::eGaussLobattoLegendre));
            LibUtilities::BasisKey B2(
                LibUtilities::eOrtho_B, order+1,
                LibUtilities::PointsKey(
                    order+1,LibUtilities::eGaussRadauMAlpha1Beta0));
            
            // Create a standard nodal prism in order to get the Vandermonde
            // matrix to perform interpolation to nodal points.
            StdRegions::StdNodalPrismExpSharedPtr nodalPrism = 
                MemoryManager<StdRegions::StdNodalPrismExp>::AllocateSharedPtr(
                    B0, B1, B2, LibUtilities::eNodalPrismEvenlySpaced);
            
            Array<OneD, NekDouble> x, y, z;
            nodalPrism->GetNodalPoints(x,y,z);
            
            SpatialDomains::PrismGeomSharedPtr geom = 
                boost::dynamic_pointer_cast<SpatialDomains::PrismGeom>(
                    this->GetGeom(3));
            
            // Create basis key for a prism.
            LibUtilities::BasisKey C0(
                LibUtilities::eOrtho_A, order+1,
                LibUtilities::PointsKey(
                    order+1,LibUtilities::eGaussLobattoLegendre));
            LibUtilities::BasisKey C1(
                LibUtilities::eOrtho_A, order+1,
                LibUtilities::PointsKey(
                    order+1,LibUtilities::eGaussLobattoLegendre));
            LibUtilities::BasisKey C2(
                LibUtilities::eOrtho_B, order+1,
                LibUtilities::PointsKey(
                    order+1,LibUtilities::eGaussRadauMAlpha1Beta0));
            
            // Create a prism.
            LocalRegions::PrismExpSharedPtr prism = 
                MemoryManager<LocalRegions::PrismExp>::AllocateSharedPtr(
                    C0, C1, C2, geom);
            
            // Get coordinate array for tetrahedron.
            int nqtot = prism->GetTotPoints();
            Array<OneD, NekDouble> alloc(6*nqtot);
            Array<OneD, NekDouble> xi(alloc);
            Array<OneD, NekDouble> yi(alloc+  nqtot);
            Array<OneD, NekDouble> zi(alloc+2*nqtot);
            Array<OneD, NekDouble> xo(alloc+3*nqtot);
            Array<OneD, NekDouble> yo(alloc+4*nqtot);
            Array<OneD, NekDouble> zo(alloc+5*nqtot);
            Array<OneD, NekDouble> tmp;
            
            prism->GetCoords(xi, yi, zi);
            
            for (i = 0; i < 3; ++i)
            {
                Array<OneD, NekDouble> coeffs(nodalPrism->GetNcoeffs());
                prism->FwdTrans(alloc+i*nqtot, coeffs);
                // Apply Vandermonde matrix to project onto nodal space.
                nodalPrism->ModalToNodal(coeffs, tmp=alloc+(i+3)*nqtot);
            }
            
            // Now extract points from the co-ordinate arrays into the
            // edge/face/volume nodes. First, extract edge-interior nodes.
            for (i = 0; i < 9; ++i)
            {
                pos = 6 + i*(order-1);
                m_edge[i]->m_edgeNodes.clear();
                for (j = 0; j < order-1; ++j)
                {
                    m_edge[i]->m_edgeNodes.push_back(
                        NodeSharedPtr(new Node(0, xo[pos+j], yo[pos+j], zo[pos+j])));
                }
            }
            // Now extract face-interior nodes.
            pos = 6 + 9*(order-1);
            for (i = 0; i < 5; ++i)
            {
                int facesize = i % 2 ? (order-2)*(order-1)/2 : (order-1)*(order-1);
                m_face[i]->m_faceNodes.clear();
                for (j = 0; j < facesize; ++j)
                {
                    m_face[i]->m_faceNodes.push_back(
                        NodeSharedPtr(new Node(0, xo[pos+j], yo[pos+j], zo[pos+j])));
                }
                pos += facesize;
            }
            
            // Finally extract volume nodes.
            for (i = pos; i < (order+1)*(order+1)*(order+2)/2; ++i)
            {
                m_volumeNodes.push_back(
                    NodeSharedPtr(new Node(0, xo[i], yo[i], zo[i])));
            }
            
            m_conf.m_order       = order;
            m_conf.m_faceNodes   = true;
            m_conf.m_volumeNodes = true;
        }

static ElementSharedPtr Nektar::Utilities::Prism::create	(	ElmtConfig	pConf,
		std::vector< NodeSharedPtr >	pNodeList,
		std::vector< int >	pTagList
	)

inlinestatic

Creates an instance of this class.

Definition at line 1425 of file MeshElements.h.

References Nektar::Utilities::Element::GetFaceList().

            {
                ElementSharedPtr e = boost::shared_ptr<Element>(
                    new Prism(pConf, pNodeList, pTagList));
                vector<FaceSharedPtr> faces = e->GetFaceList();
                for (int i = 0; i < faces.size(); ++i)
                {
                    faces[i]->m_elLink.push_back(pair<ElementSharedPtr, int>(e,i));
                }
                return e;
            }

SpatialDomains::GeometrySharedPtr Nektar::Utilities::Prism::GetGeom ( int coordDim )

virtual

Generate a Nektar++ geometry object for this element.

Reimplemented from Nektar::Utilities::Element.

Definition at line 1477 of file MeshElements.cpp.

References Nektar::Utilities::Element::m_face.

Referenced by Complete().

        {
            SpatialDomains::Geometry2DSharedPtr faces[5];
            SpatialDomains::PrismGeomSharedPtr  ret;
            
            for (int i = 0; i < 5; ++i)
            {
                faces[i] = m_face[i]->GetGeom(coordDim);
            }
            ret = MemoryManager<SpatialDomains::PrismGeom>::
                AllocateSharedPtr(faces);
            return ret;
        }

unsigned int Nektar::Utilities::Prism::GetNumNodes ( ElmtConfig pConf )

static

Return the number of nodes defining a prism.

Definition at line 1466 of file MeshElements.cpp.

References Nektar::Utilities::ElmtConfig::m_faceNodes, Nektar::Utilities::ElmtConfig::m_order, and Nektar::Utilities::ElmtConfig::m_volumeNodes.

Referenced by Nektar::Utilities::InputGmsh::GetNnodes().

        {
            int n = pConf.m_order;
            if (pConf.m_faceNodes && pConf.m_volumeNodes)
                return (n+1)*(n+1)*(n+2)/2;
            else if (pConf.m_faceNodes && !pConf.m_volumeNodes)
                return 3*(n+1)*(n+1)+2*(n+1)*(n+2)/2-9*(n+1)+6;
            else
                return 9*(n+1)-12;
        }

void Nektar::Utilities::Prism::OrientPrism ( )

protected

Orient prism to align degenerate vertices.

Orientation of prismatric elements is required so that the singular vertices of triangular faces (which occur as a part of the collapsed co-ordinate system) align. The algorithm is based on that used in T. Warburton's thesis and in the original Nektar source.

First the points are re-ordered so that the highest global IDs represent the two singular points of the prism. Then, if necessary, the nodes are rotated either clockwise or counter-clockwise (w.r.t to the p-r plane) to correctly align the prism. The #orientation variable is set to:

0 if the prism is not rotated;
1 if the prism is rotated clockwise;
2 if the prism is rotated counter-clockwise.

This is necessary for some input modules (e.g. #InputNek) which add high-order information or bounary conditions to faces.

Definition at line 1627 of file MeshElements.cpp.

References m_orientation, and Nektar::Utilities::Element::m_vertex.

Referenced by Prism().

        {
            int lid[6], gid[6];
            
            // Re-order vertices.
            for (int i = 0; i < 6; ++i)
            {
                lid[i] = i;
                gid[i] = m_vertex[i]->m_id;
            }
            gid[0] = gid[3] = max(gid[0], gid[3]);
            gid[1] = gid[2] = max(gid[1], gid[2]);
            gid[4] = gid[5] = max(gid[4], gid[5]);
            
            for (int i = 1; i < 6; ++i)
            {
                if (gid[0] < gid[i])
                {
                    swap(gid[i], gid[0]);
                    swap(lid[i], lid[0]);
                }
            }
            if (lid[0] == 4 || lid[0] == 5) 
            {
                m_orientation = 0;
            } 
            else if (lid[0] == 1 || lid[0] == 2) 
            {
                // Rotate prism clockwise in p-r plane
                vector<NodeSharedPtr> vertexmap(6);
                vertexmap[0] = m_vertex[4];
                vertexmap[1] = m_vertex[0];
                vertexmap[2] = m_vertex[3];
                vertexmap[3] = m_vertex[5];
                vertexmap[4] = m_vertex[1];
                vertexmap[5] = m_vertex[2];
                m_vertex = vertexmap;
                m_orientation = 1;
            }
            else if (lid[0] == 0 || lid[0] == 3)
            {
                // Rotate prism counter-clockwise in p-r plane
                vector<NodeSharedPtr> vertexmap(6);
                vertexmap[0] = m_vertex[1];
                vertexmap[1] = m_vertex[4];
                vertexmap[2] = m_vertex[5];
                vertexmap[3] = m_vertex[2];
                vertexmap[4] = m_vertex[0];
                vertexmap[5] = m_vertex[3];
                m_vertex = vertexmap;
                m_orientation = 2;
            }
            else
            {
                cerr << "Warning: possible prism orientation problem." << endl;
            }
        }

Member Data Documentation

unsigned int Nektar::Utilities::Prism::m_orientation

Orientation of prism; unchanged = 0; clockwise = 1; counter-clockwise = 2. This is set by OrientPrism.

Definition at line 1457 of file MeshElements.h.

Referenced by OrientPrism().

LibUtilities::ShapeType Nektar::Utilities::Prism::m_type

static

Initial value:

GetElementFactory().

RegisterCreatorFunction(LibUtilities::ePrism, Prism::create, "Prism")

Element type.

Definition at line 1440 of file MeshElements.h.

Public Member Functions

Static Public Member Functions

Public Attributes

Static Public Attributes

Protected Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation