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SymmetryBC.cpp
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3 // File: SymmetryBC.cpp
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31 //
32 // Description: Symmetry boundary condition
33 //
34 ///////////////////////////////////////////////////////////////////////////////
35 
36 #include "SymmetryBC.h"
37 
38 using namespace std;
39 
40 namespace Nektar
41 {
42 
43 std::string SymmetryBC::className = GetCFSBndCondFactory().
44  RegisterCreatorFunction("Symmetry",
45  SymmetryBC::create,
46  "Symmetry boundary condition.");
47 
48 SymmetryBC::SymmetryBC(const LibUtilities::SessionReaderSharedPtr& pSession,
50  const Array<OneD, Array<OneD, NekDouble> >& pTraceNormals,
51  const int pSpaceDim,
52  const int bcRegion,
53  const int cnt)
54  : CFSBndCond(pSession, pFields, pTraceNormals, pSpaceDim, bcRegion, cnt)
55 {
56 }
57 
60  Array<OneD, Array<OneD, NekDouble> > &physarray,
61  const NekDouble &time)
62 {
63  int i;
64  int nVariables = physarray.num_elements();
65 
66  const Array<OneD, const int> &traceBndMap
67  = m_fields[0]->GetTraceBndMap();
68 
69  // Take into account that for PDE based shock capturing, eps = 0 at the
70  // wall.
71  int e, id1, id2, nBCEdgePts, eMax;
72 
73  eMax = m_fields[0]->GetBndCondExpansions()[m_bcRegion]->GetExpSize();
74 
75  for (e = 0; e < eMax; ++e)
76  {
77  nBCEdgePts = m_fields[0]->GetBndCondExpansions()[m_bcRegion]->
78  GetExp(e)->GetTotPoints();
79  id1 = m_fields[0]->GetBndCondExpansions()[m_bcRegion]->
80  GetPhys_Offset(e);
81  id2 = m_fields[0]->GetTrace()->GetPhys_Offset(traceBndMap[m_offset+e]);
82 
83  // For 2D/3D, define: v* = v - 2(v.n)n
84  Array<OneD, NekDouble> tmp(nBCEdgePts, 0.0);
85 
86  // Calculate (v.n)
87  for (i = 0; i < m_spacedim; ++i)
88  {
89  Vmath::Vvtvp(nBCEdgePts,
90  &Fwd[1+i][id2], 1,
91  &m_traceNormals[i][id2], 1,
92  &tmp[0], 1,
93  &tmp[0], 1);
94  }
95 
96  // Calculate 2.0(v.n)
97  Vmath::Smul(nBCEdgePts, -2.0, &tmp[0], 1, &tmp[0], 1);
98 
99  // Calculate v* = v - 2.0(v.n)n
100  for (i = 0; i < m_spacedim; ++i)
101  {
102  Vmath::Vvtvp(nBCEdgePts,
103  &tmp[0], 1,
104  &m_traceNormals[i][id2], 1,
105  &Fwd[1+i][id2], 1,
106  &Fwd[1+i][id2], 1);
107  }
108 
109  // Copy boundary adjusted values into the boundary expansion
110  for (i = 0; i < nVariables; ++i)
111  {
112  Vmath::Vcopy(nBCEdgePts, &Fwd[i][id2], 1,
113  &(m_fields[i]->GetBndCondExpansions()[m_bcRegion]->
114  UpdatePhys())[id1], 1);
115  }
116  }
117 }
118 
119 }
int m_spacedim
Space dimension.
Definition: CFSBndCond.h:90
void Vvtvp(int n, const T *w, const int incw, const T *x, const int incx, const T *y, const int incy, T *z, const int incz)
vvtvp (vector times vector plus vector): z = w*x + y
Definition: Vmath.cpp:442
STL namespace.
Array< OneD, MultiRegions::ExpListSharedPtr > m_fields
Array of fields.
Definition: CFSBndCond.h:86
boost::shared_ptr< SessionReader > SessionReaderSharedPtr
Definition: MeshPartition.h:51
CFSBndCondFactory & GetCFSBndCondFactory()
Declaration of the boundary condition factory singleton.
Definition: CFSBndCond.cpp:42
void Smul(int n, const T alpha, const T *x, const int incx, T *y, const int incy)
Scalar multiply y = alpha*y.
Definition: Vmath.cpp:213
virtual void v_Apply(Array< OneD, Array< OneD, NekDouble > > &Fwd, Array< OneD, Array< OneD, NekDouble > > &physarray, const NekDouble &time)
Definition: SymmetryBC.cpp:58
Encapsulates the user-defined boundary conditions for compressible flow solver.
Definition: CFSBndCond.h:71
double NekDouble
int m_offset
Offset.
Definition: CFSBndCond.h:103
void Vcopy(int n, const T *x, const int incx, T *y, const int incy)
Definition: Vmath.cpp:1061
Array< OneD, Array< OneD, NekDouble > > m_traceNormals
Trace normals.
Definition: CFSBndCond.h:88
int m_bcRegion
Id of the boundary region.
Definition: CFSBndCond.h:101