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LinearAverageSolver.cpp
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1 ///////////////////////////////////////////////////////////////////////////////
2 //
3 // File: LinearAverageSolver.cpp
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
14 // Permission is hereby granted, free of charge, to any person obtaining a
15 // copy of this software and associated documentation files (the "Software"),
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21 // The above copyright notice and this permission notice shall be included
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24 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
25 // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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31 //
32 // Description: Simple mean value solver for the Linear Shallow Water
33 // Equations.
34 //
35 ///////////////////////////////////////////////////////////////////////////////
36 
38 
39 namespace Nektar
40 {
43  "LinearAverage",
45  "Average Value Riemann solver");
46 
48  {
49 
50  }
51 
52  /**
53  * @brief Average Value Riemann solver for the Linear Shallow
54  * Water Equations
55  *
56  * @param etaL Free surface elevation left state.
57  * @param etaR Free surface elevation right state.
58  * @param uL x-velocity left state.
59  * @param uR x-velocity right state.
60  * @param vL y-velocity left state.
61  * @param vR y-velocity right state.
62  * @param dL still water depth component left state.
63  * @param dR still water depth component right state.
64  * @param etaf Computed Riemann flux for continuity.
65  * @param uf Computed Riemann flux for x-momentum component
66  * @param vf Computed Riemann flux for y-momentum component
67  */
69  double etaL, double uL, double vL, double dL,
70  double etaR, double uR, double vR, double dR,
71  double &etaf, double &uf, double &vf)
72  {
73  static NekDouble g = m_params["gravity"]();
74 
75  etaf = 0.5 * (dL * uL + dR * uR);
76  uf = 0.5 * (g * etaL + g * etaR);
77  vf = 0.0;
78  }
79 }