FreeFOAM The Cross-Platform CFD Toolkit
geomDecomp.C
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25 
27 
28 // * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
29 
31 (
32  const dictionary& decompositionDict,
33  const word& derivedType
34 )
35 :
36  decompositionMethod(decompositionDict),
37  geomDecomDict_(decompositionDict.subDict(derivedType + "Coeffs")),
38  n_(geomDecomDict_.lookup("n")),
39  delta_(readScalar(geomDecomDict_.lookup("delta"))),
40  rotDelta_(I)
41 {
42  // check that the case makes sense :
43 
44  if (nProcessors_ != n_.x()*n_.y()*n_.z())
45  {
47  (
48  "geomDecomp::geomDecomp"
49  "(const dictionary& decompositionDict)"
50  ) << "Wrong number of processor divisions in geomDecomp:" << nl
51  << "Number of domains : " << nProcessors_ << nl
52  << "Wanted decomposition : " << n_
53  << exit(FatalError);
54  }
55 
56  scalar d = 1 - 0.5*delta_*delta_;
57  scalar d2 = sqr(d);
58 
59  scalar a = delta_;
60  scalar a2 = sqr(a);
61 
62  rotDelta_ = tensor
63  (
64  d2, -a*d, a,
65  a*d - a2*d, a*a2 + d2, -2*a*d,
66  a*d2 + a2, a*d - a2*d, d2 - a2
67  );
68 }
69 
70 
71 // ************************ vim: set sw=4 sts=4 et: ************************ //