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TerminalOutflow.cpp
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2 //
3 // File CommMpi.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: ROuflow class
33 //
34 ///////////////////////////////////////////////////////////////////////////////
35 
37 
38 namespace Nektar
39 {
40 
41  std::string TerminalOutflow::className
43  "Terminal",
45  "Terminal outflow boundary condition");
46 
47  /**
48  *
49  */
52  PulseWavePressureAreaSharedPtr pressureArea)
53  : PulseWaveBoundary(pVessel,pSession,pressureArea)
54  {
55  }
56 
57  /**
58  *
59  */
61  {
62 
63  }
64 
66  const Array<OneD,const Array<OneD, NekDouble> > &inarray,
69  const NekDouble time,
70  int omega,int offset,int n)
71  {
72  NekDouble A_r, u_r;
73  NekDouble RT, A_l, u_l, u_0, c_0, c_l;
74 
76 
77  vessel[0] = m_vessels[2*omega];
78  vessel[1] = m_vessels[2*omega+1];
79 
80  /* Find the terminal resistance boundary condition and
81  * calculate the reflection. We assume A_r = A_l and
82  * apply the reflection in u_r after paper
83  * "Computational Modelling of 1D blood flow"*/
84 
85  // Note: The R_t value is contained in A in the inputfile
86  RT = (vessel[0]->UpdateBndCondExpansion(n))->GetCoeffs()[0];
87 
88  ASSERTL0((-1<=RT && RT<=1),
89  "RT must be comprised between -1 and 1");
90  int nq = vessel[0]->GetTotPoints();
91 
92  // Get the left values A_l and u_l needed for Eq. 37
93  A_l = inarray[0][offset+nq-1];
94  u_l = inarray[1][offset+nq-1];
95 
96  // Get the values at initial state u_0, c_0
97  u_0 = 0.0; //for all vessels start from initial condition 0
98  c_0 = sqrt(beta[omega][nq-1]/(2*m_rho))*sqrt(sqrt(A_0[omega][nq-1]));
99 
100  // Calculate the boundary values
101  A_r = A_l;
102  c_l = sqrt(beta[omega][nq-1]/(2*m_rho))*sqrt(sqrt(A_l));
103  u_r = (1-RT)*((u_l-u_0) + 4*(c_l-c_0)) - u_l;
104 
105  // Store the new values in the boundary condition
106  (vessel[0]->UpdateBndCondExpansion(n))->UpdatePhys()[0] = A_r;
107  (vessel[1]->UpdateBndCondExpansion(n))->UpdatePhys()[0] = u_r;
108  }
109 
110 }
#define ASSERTL0(condition, msg)
Definition: ErrorUtil.hpp:161
static std::string className
Name of class.
Array< OneD, MultiRegions::ExpListSharedPtr > m_vessels
boost::shared_ptr< SessionReader > SessionReaderSharedPtr
Definition: MeshPartition.h:51
BoundaryFactory & GetBoundaryFactory()
static PulseWaveBoundarySharedPtr create(Array< OneD, MultiRegions::ExpListSharedPtr > &pVessel, const LibUtilities::SessionReaderSharedPtr &pSession, PulseWavePressureAreaSharedPtr &pressureArea)
Creates an instance of this class.
virtual void v_DoBoundary(const Array< OneD, const Array< OneD, NekDouble > > &inarray, Array< OneD, Array< OneD, NekDouble > > &A_0, Array< OneD, Array< OneD, NekDouble > > &beta, const NekDouble time, int omega, int offset, int n)
double NekDouble
TerminalOutflow(Array< OneD, MultiRegions::ExpListSharedPtr > pVessel, const LibUtilities::SessionReaderSharedPtr pSession, PulseWavePressureAreaSharedPtr pressureArea)
boost::shared_ptr< PulseWavePressureArea > PulseWavePressureAreaSharedPtr
tKey RegisterCreatorFunction(tKey idKey, CreatorFunction classCreator, tDescription pDesc="")
Register a class with the factory.
Definition: NekFactory.hpp:215