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UnsteadyAdvectionDiffusion.h
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1 ///////////////////////////////////////////////////////////////////////////////
2 //
3 // File UnsteadyAdvectionDiffusion.h
4 //
5 // For more information, please see: http://www.nektar.info
6 //
7 // The MIT License
8 //
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).
12 //
13 // License for the specific language governing rights and limitations under
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31 //
32 // Description: Unsteady advection-diffusion solve routines
33 //
34 ///////////////////////////////////////////////////////////////////////////////
35 
36 #ifndef NEKTAR_SOLVERS_ADRSOLVER_EQUATIONSYSTEMS_UNSTEADYADVECTIONDIFFUSION_H
37 #define NEKTAR_SOLVERS_ADRSOLVER_EQUATIONSYSTEMS_UNSTEADYADVECTIONDIFFUSION_H
38 
43 
44 namespace Nektar
45 {
47  {
48  public:
50 
51  /// Creates an instance of this class
53  const LibUtilities::SessionReaderSharedPtr& pSession) {
56  AllocateSharedPtr(pSession);
57  p->InitObject();
58  return p;
59  }
60  /// Name of class
61  static std::string className;
62 
63  /// Destructor
65 
66  protected:
68  NekDouble m_sVVCutoffRatio; // cut off ratio from which to start decayhing modes
69  NekDouble m_sVVDiffCoeff; // Diffusion coefficient of SVV modes
72  Array<OneD, Array<OneD, NekDouble> > m_velocity;
73  Array<OneD, NekDouble> m_traceVn;
74 
75  // Plane (used only for Discontinous projection
76  // with 3DHomogenoeus1D expansion)
78 
79  /// Session reader
81  const LibUtilities::SessionReaderSharedPtr& pSession);
82 
83  /// Evaluate the flux at each solution point for the advection part
84  void GetFluxVectorAdv(
85  const Array<OneD, Array<OneD, NekDouble> > &physfield,
86  Array<OneD, Array<OneD, Array<OneD, NekDouble> > > &flux);
87 
88  /// Evaluate the flux at each solution point for the diffusion part
89  void GetFluxVectorDiff(
90  const int i,
91  const int j,
92  const Array<OneD, Array<OneD, NekDouble> > &physfield,
93  Array<OneD, Array<OneD, NekDouble> > &derivatives,
94  Array<OneD, Array<OneD, NekDouble> > &flux);
95 
96  /// Compute the RHS
97  virtual void DoOdeRhs(
98  const Array<OneD, const Array<OneD, NekDouble> >&inarray,
99  Array<OneD, Array<OneD, NekDouble> >&outarray,
100  const NekDouble time);
101 
102  /// Perform the projection
103  void DoOdeProjection(
104  const Array<OneD, const Array<OneD, NekDouble> > &inarray,
105  Array<OneD, Array<OneD, NekDouble> > &outarray,
106  const NekDouble time);
107 
108  /// Solve implicitly the diffusion term
109  virtual void DoImplicitSolve(
110  const Array<OneD, const Array<OneD, NekDouble> >&inarray,
111  Array<OneD, Array<OneD, NekDouble> >&outarray,
112  NekDouble time,
113  NekDouble lambda);
114 
115  /// Get the normal velocity
116  Array<OneD, NekDouble> &GetNormalVelocity();
117 
118  /// Initialise the object
119  virtual void v_InitObject();
120 
121  /// Print Summary
123 
124  private:
127  };
128 }
129 
130 #endif