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AdvectionNonConservative.cpp
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1 ///////////////////////////////////////////////////////////////////////////////
2 //
3 // File: AdvectionNonConservative.cpp
4 //
5 // For more information, please see: http://www.nektar.info
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7 // The MIT License
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9 // Copyright (c) 2006 Division of Applied Mathematics, Brown University (USA),
10 // Department of Aeronautics, Imperial College London (UK), and Scientific
11 // Computing and Imaging Institute, University of Utah (USA).
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31 //
32 // Description: Non-conservative advection class.
33 //
34 ///////////////////////////////////////////////////////////////////////////////
35 
37 
38 namespace Nektar
39 {
40  namespace SolverUtils
41  {
43  RegisterCreatorFunction("NonConservative",
45 
47  {
48 
49  }
50 
51  /**
52  * @brief Initialise AdvectionNonConservative objects and store them
53  * before starting the time-stepping.
54  *
55  * @param pSession Pointer to session reader.
56  * @param pFields Pointer to fields.
57  */
60  Array<OneD, MultiRegions::ExpListSharedPtr> pFields)
61  {
62  Advection::v_InitObject(pSession, pFields);
63  }
64 
66  const int nConvectiveFields,
67  const Array<OneD, MultiRegions::ExpListSharedPtr> &fields,
68  const Array<OneD, Array<OneD, NekDouble> > &advVel,
69  const Array<OneD, Array<OneD, NekDouble> > &inarray,
70  Array<OneD, Array<OneD, NekDouble> > &outarray,
71  const NekDouble &time)
72  {
73  int nDim = advVel.num_elements();
74  int nPointsTot = fields[0]->GetNpoints();
75  Array<OneD, NekDouble> grad0,grad1,grad2;
76 
77  grad0 = Array<OneD, NekDouble> (nPointsTot);
78 
79  if (nDim > 1)
80  {
81  grad1 = Array<OneD,NekDouble>(nPointsTot);
82  }
83 
84  if (nDim > 2)
85  {
86  grad2 = Array<OneD,NekDouble>(nPointsTot);
87  }
88 
89 
90  for (int i = 0; i < nConvectiveFields; ++i)
91  {
92  // Evaluate V \cdot Grad(u)
93  switch(nDim)
94  {
95  case 1:
96  fields[0]->PhysDeriv(inarray[i], grad0);
97 
98  Vmath::Vmul(nPointsTot,
99  grad0, 1,
100  advVel[0], 1,
101  outarray[i], 1);
102  break;
103  case 2:
104  fields[0]->PhysDeriv(inarray[i], grad0, grad1);
105 
106 
107  // Calculate advection terms
108  Vmath::Vmul (nPointsTot,
109  grad0, 1,
110  advVel[0], 1,
111  outarray[i], 1);
112 
113  Vmath::Vvtvp(nPointsTot,
114  grad1, 1,
115  advVel[1], 1,
116  outarray[i], 1,
117  outarray[i], 1);
118 
119  break;
120  case 3:
121  fields[0]->PhysDeriv(inarray[i], grad0, grad1, grad2);
122 
123  // Calculate advection terms
124  Vmath::Vmul (nPointsTot,
125  grad0, 1,
126  advVel[0], 1,
127  outarray[i], 1);
128 
129  Vmath::Vvtvp(nPointsTot,
130  grad1, 1,
131  advVel[1], 1,
132  outarray[i], 1,
133  outarray[i], 1);
134 
135  Vmath::Vvtvp(nPointsTot,
136  grad2, 1,
137  advVel[2], 1,
138  outarray[i], 1,
139  outarray[i], 1);
140  break;
141  default:
142  ASSERTL0(false,"dimension unknown");
143  }
144  }
145  }
146  }
147 }