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ForcingBody.cpp
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2 //
3 // File: ForcingBody.cpp
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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: Body forcing
33 //
34 ///////////////////////////////////////////////////////////////////////////////
35 
37 #include <MultiRegions/ExpList.h>
38 
39 using namespace std;
40 
41 namespace Nektar
42 {
43 namespace SolverUtils
44 {
45 
46  std::string ForcingBody::classNameBody = GetForcingFactory().
47  RegisterCreatorFunction("Body",
48  ForcingBody::create,
49  "Body Forcing");
50  std::string ForcingBody::classNameField = GetForcingFactory().
51  RegisterCreatorFunction("Field",
52  ForcingBody::create,
53  "Field Forcing");
54 
55  ForcingBody::ForcingBody(
57  : Forcing(pSession),
58  m_hasTimeFcnScaling(false)
59  {
60  }
61 
64  const unsigned int& pNumForcingFields,
65  const TiXmlElement* pForce)
66  {
67  m_NumVariable = pNumForcingFields;
68  int nq = pFields[0]->GetTotPoints();
69 
70  const TiXmlElement* funcNameElmt = pForce->FirstChildElement("BODYFORCE");
71  if(!funcNameElmt)
72  {
73  funcNameElmt = pForce->FirstChildElement("FIELDFORCE");
74 
75  ASSERTL0(funcNameElmt, "Requires BODYFORCE or FIELDFORCE tag "
76  "specifying function name which prescribes body force.");
77  }
78 
79  string funcName = funcNameElmt->GetText();
80  ASSERTL0(m_session->DefinesFunction(funcName),
81  "Function '" + funcName + "' not defined.");
82 
83  // Time function is optional
84  funcNameElmt = pForce->FirstChildElement("BODYFORCETIMEFCN");
85  if(!funcNameElmt)
86  {
87  funcNameElmt = pForce->FirstChildElement("FIELDFORCETIMEFCN");
88  }
89 
90  // Load time function if specified
91  if(funcNameElmt)
92  {
93  std::string funcNameTime = funcNameElmt->GetText();
94 
95  ASSERTL0(!funcNameTime.empty(),
96  "Expression must be given in BODYFORCETIMEFCN or "
97  "FIELDFORCETIMEFCN.");
98 
99  m_session->SubstituteExpressions(funcNameTime);
101  ::AllocateSharedPtr(m_session,funcNameTime);
102 
103  m_hasTimeFcnScaling = true;
104  }
105 
107 
108  std::string s_FieldStr;
109 
110  for (int i = 0; i < m_NumVariable; ++i)
111  {
112  m_Forcing[i] = Array<OneD, NekDouble> (nq, 0.0);
113  s_FieldStr = m_session->GetVariable(i);
114  ASSERTL0(m_session->DefinesFunction(funcName, s_FieldStr),
115  "Variable '" + s_FieldStr + "' not defined.");
116  EvaluateFunction(pFields, m_session, s_FieldStr,
117  m_Forcing[i], funcName);
118  }
119 
120  bool singleMode, halfMode;
121  m_session->MatchSolverInfo("ModeType","SingleMode",singleMode,false);
122  m_session->MatchSolverInfo("ModeType","HalfMode", halfMode, false);
123  bool homogeneous = pFields[0]->GetExpType() == MultiRegions::e3DH1D;
124 
125  // If singleMode or halfMode, transform the forcing term to be in
126  // physical space in the plane, but Fourier space in the homogeneous
127  // direction
128  if (singleMode || halfMode || homogeneous)
129  {
130  for (int i = 0; i < m_NumVariable; ++i)
131  {
132  pFields[0]->HomogeneousFwdTrans(m_Forcing[i],m_Forcing[i]);
133  }
134  }
135  }
136 
139  const Array<OneD, Array<OneD, NekDouble> > &inarray,
140  Array<OneD, Array<OneD, NekDouble> > &outarray,
141  const NekDouble &time)
142  {
143 
145  {
146  Array<OneD, NekDouble> TimeFcn(1);
147 
148  for (int i = 0; i < m_NumVariable; i++)
149  {
150  EvaluateTimeFunction(time, m_timeFcnEqn, TimeFcn);
151 
152  Vmath::Svtvp(outarray[i].num_elements(), TimeFcn[0],
153  m_Forcing[i], 1,
154  outarray[i], 1,
155  outarray[i], 1);
156  }
157  }
158  else
159  {
160  for (int i = 0; i < m_NumVariable; i++)
161  {
162  Vmath::Vadd(outarray[i].num_elements(), outarray[i], 1,
163  m_Forcing[i], 1, outarray[i], 1);
164  }
165  }
166  }
167 
168 }
169 }
SOLVER_UTILS_EXPORT void EvaluateTimeFunction(LibUtilities::SessionReaderSharedPtr pSession, std::string pFieldName, Array< OneD, NekDouble > &pArray, const std::string &pFunctionName, NekDouble pTime=NekDouble(0))
Definition: Forcing.cpp:121
Array< OneD, Array< OneD, NekDouble > > m_Forcing
Evaluated forcing function.
Definition: Forcing.h:97
#define ASSERTL0(condition, msg)
Definition: ErrorUtil.hpp:161
static boost::shared_ptr< DataType > AllocateSharedPtr()
Allocate a shared pointer from the memory pool.
void Svtvp(int n, const T alpha, const T *x, const int incx, const T *y, const int incy, T *z, const int incz)
svtvp (scalar times vector plus vector): z = alpha*x + y
Definition: Vmath.cpp:471
ForcingFactory & GetForcingFactory()
Declaration of the forcing factory singleton.
Definition: Forcing.cpp:44
STL namespace.
SOLVER_UTILS_EXPORT void EvaluateFunction(Array< OneD, MultiRegions::ExpListSharedPtr > pFields, LibUtilities::SessionReaderSharedPtr pSession, std::string pFieldName, Array< OneD, NekDouble > &pArray, const std::string &pFunctionName, NekDouble pTime=NekDouble(0))
Definition: Forcing.cpp:151
boost::shared_ptr< SessionReader > SessionReaderSharedPtr
Definition: MeshPartition.h:51
double NekDouble
LibUtilities::SessionReaderSharedPtr m_session
Session reader.
Definition: Forcing.h:95
int m_NumVariable
Number of variables.
Definition: Forcing.h:99
LibUtilities::EquationSharedPtr m_timeFcnEqn
Definition: ForcingBody.h:92
virtual SOLVER_UTILS_EXPORT void v_Apply(const Array< OneD, MultiRegions::ExpListSharedPtr > &fields, const Array< OneD, Array< OneD, NekDouble > > &inarray, Array< OneD, Array< OneD, NekDouble > > &outarray, const NekDouble &time)
virtual SOLVER_UTILS_EXPORT void v_InitObject(const Array< OneD, MultiRegions::ExpListSharedPtr > &pFields, const unsigned int &pNumForcingFields, const TiXmlElement *pForce)
Definition: ForcingBody.cpp:62
Defines a forcing term to be explicitly applied.
Definition: Forcing.h:70
void Vadd(int n, const T *x, const int incx, const T *y, const int incy, T *z, const int incz)
Add vector z = x+y.
Definition: Vmath.cpp:285