FreeFOAM The Cross-Platform CFD Toolkit
engineSwirl.C
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3  \\ / F ield | OpenFOAM: The Open Source CFD Toolbox
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5  \\ / A nd | Copyright (C) 1991-2010 OpenCFD Ltd.
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23 
24 Application
25  engineSwirl
26 
27 Description
28  Generates a swirling flow for engine calulations
29 
30 Usage
31 
32  - engineSwirl [OPTIONS]
33 
34  @param -case <dir>\n
35  Case directory.
36 
37  @param -parallel \n
38  Run in parallel.
39 
40  @param -help \n
41  Display help message.
42 
43  @param -doc \n
44  Display Doxygen API documentation page for this application.
45 
46  @param -srcDoc \n
47  Display Doxygen source documentation page for this application.
48 
49 \*---------------------------------------------------------------------------*/
50 
51 #include <finiteVolume/fvCFD.H>
53 
54 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
55 
56 int main(int argc, char *argv[])
57 {
58 
59 # include <OpenFOAM/setRootCase.H>
60 # include <OpenFOAM/createTime.H>
61 # include <OpenFOAM/createMesh.H>
62 # include "createFields.H"
63 
64 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
65 
66  scalar Vphi = (mathematicalConstant::pi*swirlRPMRatio*rpm/30).value();
67  scalar b1 = j1(swirlProfile).value();
68  scalar b2 = 2.0*b1/swirlProfile.value() - j0(swirlProfile).value();
69 
70  scalar omega = 0.125*(Vphi*bore*swirlProfile/b2).value();
71 
72  scalar cylinderRadius = 0.5*bore.value();
73 
74  scalar Umax = 0.0;
75  forAll(mesh.C(), celli)
76  {
77  vector c = mesh.C()[celli] - swirlCenter;
78  scalar r = ::pow(sqr(c & xT) + sqr(c & yT), 0.5);
79 
80  if (r <= cylinderRadius)
81  {
82  scalar b = j1(swirlProfile*r/cylinderRadius).value();
83  scalar vEff = omega*b;
84  r = max(r, SMALL);
85  U[celli] = ((vEff/r)*(c & yT))*xT + (-(vEff/r)*(c & xT))*yT;
86  Umax = max(Umax, mag(U[celli]));
87  }
88  }
89 
90  Info << "Umax = " << Umax << endl;
91 
92  U.write();
93 
94  Info << "\n end\n";
95 
96  return 0;
97 }
98 
99 
100 // ************************ vim: set sw=4 sts=4 et: ************************ //