randomDecomp.C

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    Copyright (C) 2019-2023 OpenCFD Ltd.
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.

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#include "randomDecomp.H"
#include "Random.H"
#include "addToRunTimeSelectionTable.H"

// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //

namespace Foam
{
    defineTypeName(randomDecomp);
    addToRunTimeSelectionTable
    (
        decompositionMethod,
        randomDecomp,
        dictionary
    );
}


// * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //

Foam::labelList Foam::randomDecomp::randomMap(const label nCells) const
{
    Random rndGen(0);

    labelList finalDecomp(nCells);

    if (agglom_ > 1)
    {
        label cached = 0;
        label repeat = 0;

        for (label& val : finalDecomp)
        {
            if (!repeat)
            {
                cached = rndGen.position<label>(0, nDomains_ - 1);
                repeat = agglom_;
            }
            --repeat;

            val = cached;
        }
    }
    else
    {
        for (label& val : finalDecomp)
        {
            val = rndGen.position<label>(0, nDomains_ - 1);
        }
    }

    return finalDecomp;
}


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

Foam::randomDecomp::randomDecomp(const label numDomains)
:
    decompositionMethod(numDomains),
    agglom_(0)
{}


Foam::randomDecomp::randomDecomp
(
    const dictionary& decompDict,
    const word& regionName,
    int select
)
:
    decompositionMethod(decompDict, regionName),
    agglom_(0)
{
    const dictionary& coeffs = findCoeffsDict(typeName + "Coeffs", select);

    // No sanity check needed here (done in randomMap routine)
    coeffs.readIfPresent("agglom", agglom_);
}


// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //

Foam::labelList Foam::randomDecomp::decompose
(
    const pointField& points,
    const scalarField&
) const
{
    return randomMap(points.size());
}


Foam::labelList Foam::randomDecomp::decompose
(
    const polyMesh& mesh,
    const pointField&,
    const scalarField&
) const
{
    return randomMap(mesh.nCells());
}


Foam::labelList Foam::randomDecomp::decompose
(
    const CompactListList<label>& globalCellCells,
    const pointField&,
    const scalarField&
) const
{
    return randomMap(globalCellCells.size());
}


Foam::labelList Foam::randomDecomp::decompose
(
    const labelListList& globalCellCells,
    const pointField&,
    const scalarField&
) const
{
    return randomMap(globalCellCells.size());
}


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