FreeFOAM The Cross-Platform CFD Toolkit
channelFoam.C
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3  \\ / F ield | OpenFOAM: The Open Source CFD Toolbox
4  \\ / O peration |
5  \\ / A nd | Copyright (C) 1991-2010 OpenCFD Ltd.
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10 
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19  for more details.
20 
21  You should have received a copy of the GNU General Public License
22  along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
23 
24 Application
25  channelFoam
26 
27 Description
28  Incompressible LES solver for flow in a channel.
29 
30 Usage
31  - channelFoam [OPTION]
32 
33  @param -case <dir> \n
34  Specify the case directory
35 
36  @param -parallel \n
37  Run the case in parallel
38 
39  @param -help \n
40  Display short usage message
41 
42  @param -doc \n
43  Display Doxygen documentation page
44 
45  @param -srcDoc \n
46  Display source code
47 
48 \*---------------------------------------------------------------------------*/
49 
50 #include <finiteVolume/fvCFD.H>
53 #include <OpenFOAM/IFstream.H>
54 #include <OpenFOAM/OFstream.H>
55 #include <OpenFOAM/Random.H>
56 
57 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
58 
59 int main(int argc, char *argv[])
60 {
61  #include <OpenFOAM/setRootCase.H>
62  #include <OpenFOAM/createTime.H>
63  #include <OpenFOAM/createMesh.H>
64  #include "readTransportProperties.H"
65  #include "createFields.H"
67  #include "createGradP.H"
68 
69  Info<< "\nStarting time loop\n" << endl;
70 
71  while (runTime.loop())
72  {
73  Info<< "Time = " << runTime.timeName() << nl << endl;
74 
76 
77  #include <finiteVolume/CourantNo.H>
78 
79  sgsModel->correct();
80 
82  (
83  fvm::ddt(U)
84  + fvm::div(phi, U)
85  + sgsModel->divDevBeff(U)
86  ==
88  );
89 
91  {
92  solve(UEqn == -fvc::grad(p));
93  }
94 
95 
96  // --- PISO loop
97 
98  volScalarField rUA = 1.0/UEqn.A();
99 
100  for (int corr=0; corr<nCorr; corr++)
101  {
102  U = rUA*UEqn.H();
103  phi = (fvc::interpolate(U) & mesh.Sf())
104  + fvc::ddtPhiCorr(rUA, U, phi);
105 
106  adjustPhi(phi, U, p);
107 
108  for (int nonOrth=0; nonOrth<=nNonOrthCorr; nonOrth++)
109  {
110  fvScalarMatrix pEqn
111  (
112  fvm::laplacian(rUA, p) == fvc::div(phi)
113  );
114 
115  pEqn.setReference(pRefCell, pRefValue);
116 
117  if (corr == nCorr-1 && nonOrth == nNonOrthCorr)
118  {
119  pEqn.solve(mesh.solver(p.name() + "Final"));
120  }
121  else
122  {
123  pEqn.solve(mesh.solver(p.name()));
124  }
125 
126  if (nonOrth == nNonOrthCorr)
127  {
128  phi -= pEqn.flux();
129  }
130  }
131 
133 
134  U -= rUA*fvc::grad(p);
135  U.correctBoundaryConditions();
136  }
137 
138 
139  // Correct driving force for a constant mass flow rate
140 
141  // Extract the velocity in the flow direction
142  dimensionedScalar magUbarStar =
143  (flowDirection & U)().weightedAverage(mesh.V());
144 
145  // Calculate the pressure gradient increment needed to
146  // adjust the average flow-rate to the correct value
147  dimensionedScalar gragPplus =
148  (magUbar - magUbarStar)/rUA.weightedAverage(mesh.V());
149 
150  U += flowDirection*rUA*gragPplus;
151 
152  gradP += gragPplus;
153 
154  Info<< "Uncorrected Ubar = " << magUbarStar.value() << tab
155  << "pressure gradient = " << gradP.value() << endl;
156 
157  runTime.write();
158 
159  #include "writeGradP.H"
160 
161  Info<< "ExecutionTime = " << runTime.elapsedCpuTime() << " s"
162  << " ClockTime = " << runTime.elapsedClockTime() << " s"
163  << nl << endl;
164  }
165 
166  Info<< "End\n" << endl;
167 
168  return 0;
169 }
170 
171 
172 // ************************ vim: set sw=4 sts=4 et: ************************ //