geomDecomp.C

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#include <decompositionMethods/geomDecomp.H>

// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //

Foam::geomDecomp::geomDecomp
(
    const dictionary& decompositionDict,
    const word& derivedType
)
:
    decompositionMethod(decompositionDict),
    geomDecomDict_(decompositionDict.subDict(derivedType + "Coeffs")),
    n_(geomDecomDict_.lookup("n")),
    delta_(readScalar(geomDecomDict_.lookup("delta"))),
    rotDelta_(I)
{
    // check that the case makes sense :

    if (nProcessors_ != n_.x()*n_.y()*n_.z())
    {
        FatalErrorIn
        (
            "geomDecomp::geomDecomp"
            "(const dictionary& decompositionDict)"
        )   << "Wrong number of processor divisions in geomDecomp:" << nl
            << "Number of domains    : " << nProcessors_ << nl
            << "Wanted decomposition : " << n_
            << exit(FatalError);
    }

    scalar d = 1 - 0.5*delta_*delta_;
    scalar d2 = sqr(d);

    scalar a = delta_;
    scalar a2 = sqr(a);

    rotDelta_ = tensor
    (
        d2,         -a*d,         a,
        a*d - a2*d,  a*a2 + d2,  -2*a*d,
        a*d2 + a2,   a*d - a2*d,  d2 - a2
    );
}


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