geometric.C

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#include "geometric.H"
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
Foam::decompositionMethods::geometric::geometric
(
    const dictionary& decompositionDict,
    const dictionary& methodDict
)
:
    decompositionMethod(decompositionDict),
    n_(methodDict.lookup("n")),
    delta_(methodDict.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 geometric:" << 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
    );
}
 
 
// ************************************************************************* //