geomDecomp.C

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#include "geomDecomp.H"

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

Foam::geomDecomp::geomDecomp
(
    const dictionary& decompositionDict,
    const word& derivedType
)
:
    decompositionMethod(decompositionDict),
    geomDecomDict_(decompositionDict.optionalSubDict(derivedType + "Coeffs")),
    n_(geomDecomDict_.lookup("n")),
    delta_(geomDecomDict_.lookupOrDefault<scalar>("delta", 0.001)),
    rotDelta_(I)
{
    // Check that the decomposition specification makes sense:
    if (nProcessors_ != n_.x()*n_.y()*n_.z())
    {
        FatalErrorInFunction
            << "Wrong number of processor divisions in geomDecomp:" << nl
            << "Number of domains    : " << nProcessors_ << nl
            << "Wanted decomposition : " << n_
            << exit(FatalError);
    }

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

    const scalar a = delta_;
    const 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
    );
}


// ************************************************************************* //