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ForcingAbsorption.cpp
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1 ///////////////////////////////////////////////////////////////////////////////
2 //
3 // File: ForcingAbsorption.cpp
4 //
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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: Absorption layer forcing
33 //
34 ///////////////////////////////////////////////////////////////////////////////
35 
37 
38 namespace Nektar
39 {
40 namespace SolverUtils
41 {
42 
44  RegisterCreatorFunction("Absorption",
46  "Forcing Absorption");
47 
49  : Forcing(pSession),
50  m_hasRefFlow(false),
51  m_hasRefFlowTime(false)
52  {
53  }
54 
56  const Array<OneD, MultiRegions::ExpListSharedPtr>& pFields,
57  const unsigned int& pNumForcingFields,
58  const TiXmlElement* pForce)
59  {
60  m_NumVariable = pNumForcingFields;
61  int npts = pFields[0]->GetTotPoints();
62 
63  const TiXmlElement* funcNameElmt;
64  funcNameElmt = pForce->FirstChildElement("COEFF");
65  ASSERTL0(funcNameElmt, "Requires COEFF tag, specifying function "
66  "name which prescribes absorption layer coefficient.");
67 
68  string funcName = funcNameElmt->GetText();
69  ASSERTL0(m_session->DefinesFunction(funcName),
70  "Function '" + funcName + "' not defined.");
71 
72  std::string s_FieldStr;
73  m_Absorption = Array<OneD, Array<OneD, NekDouble> > (m_NumVariable);
74  m_Forcing = Array<OneD, Array<OneD, NekDouble> > (m_NumVariable);
75  for (int i = 0; i < m_NumVariable; ++i)
76  {
77  s_FieldStr = m_session->GetVariable(i);
78  ASSERTL0(m_session->DefinesFunction(funcName, s_FieldStr),
79  "Variable '" + s_FieldStr + "' not defined.");
80  m_Absorption[i] = Array<OneD, NekDouble> (npts, 0.0);
81  m_Forcing[i] = Array<OneD, NekDouble> (npts, 0.0);
82  EvaluateFunction(pFields, m_session, s_FieldStr,
83  m_Absorption[i], funcName);
84  }
85 
86  funcNameElmt = pForce->FirstChildElement("REFFLOW");
87  if (funcNameElmt)
88  {
89  string funcName = funcNameElmt->GetText();
90  ASSERTL0(m_session->DefinesFunction(funcName),
91  "Function '" + funcName + "' not defined.");
92 
93  m_Refflow = Array<OneD, Array<OneD, NekDouble> > (m_NumVariable);
94  for (int i = 0; i < m_NumVariable; ++i)
95  {
96  s_FieldStr = m_session->GetVariable(i);
97  ASSERTL0(m_session->DefinesFunction(funcName, s_FieldStr),
98  "Variable '" + s_FieldStr + "' not defined.");
99  m_Refflow[i] = Array<OneD, NekDouble> (npts, 0.0);
100  EvaluateFunction(pFields, m_session, s_FieldStr,
101  m_Refflow[i], funcName);
102  }
103  m_hasRefFlow = true;
104  }
105 
106  funcNameElmt = pForce->FirstChildElement("REFFLOWTIME");
107  if (funcNameElmt)
108  {
109  m_funcNameTime = funcNameElmt->GetText();
110  ASSERTL0(m_session->DefinesFunction(funcName),
111  "Function '" + funcName + "' not defined.");
112  m_hasRefFlowTime = true;
113  }
114 
115  }
116 
118  const Array<OneD, MultiRegions::ExpListSharedPtr> &fields,
119  const Array<OneD, Array<OneD, NekDouble> > &inarray,
120  Array<OneD, Array<OneD, NekDouble> > &outarray,
121  const NekDouble &time)
122  {
123  int nq = m_Forcing[0].num_elements();
124 
125  std::string s_FieldStr;
126  Array<OneD, NekDouble> TimeScale(1);
127  Array<OneD, Array<OneD, NekDouble> > RefflowScaled(m_NumVariable);
128 
129  if (m_hasRefFlow)
130  {
131  for (int i = 0; i < m_NumVariable; i++)
132  {
133  RefflowScaled[i] = Array<OneD, NekDouble> (nq);
134  if (m_hasRefFlowTime)
135  {
136  s_FieldStr = m_session->GetVariable(i);
137  EvaluateTimeFunction(m_session, s_FieldStr, TimeScale, m_funcNameTime, time);
138  Vmath::Smul(nq, TimeScale[0], m_Refflow[i],1,RefflowScaled[i],1);
139  }
140  else
141  {
142  Vmath::Vcopy(nq, m_Refflow[i],1, RefflowScaled[i],1);
143  }
144 
145 
146  Vmath::Vsub(nq, inarray[i], 1,
147  RefflowScaled[i], 1, m_Forcing[i], 1);
148  Vmath::Vmul(nq, m_Absorption[i], 1,
149  m_Forcing[i], 1, m_Forcing[i], 1);
150  Vmath::Vadd(nq, m_Forcing[i], 1,
151  outarray[i], 1, outarray[i], 1);
152  }
153  }
154  else
155  {
156  for (int i = 0; i < m_NumVariable; i++)
157  {
158  Vmath::Vmul(nq, m_Absorption[i], 1,
159  inarray[i], 1, m_Forcing[i], 1);
160  Vmath::Vadd(nq, m_Forcing[i], 1,
161  outarray[i], 1, outarray[i], 1);
162  }
163  }
164  }
165 
166 }
167 }