packingLimiter.H

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    if (packingLimiter)
    {
        // Calculating exceeding volume fractions
        volScalarField alphaEx = max(alpha - alphaMax, scalar(0));

        // Finding neighbouring cells of the whole domain
        labelListList neighbour = mesh.cellCells();
        scalarField cellVolumes = mesh.cellVolumes();

        forAll (alphaEx, celli)
        {
            // Finding the labels of the neighbouring cells
            labelList neighbourCell = neighbour[celli];

            // Initializing neighbouring cells contribution
            scalar neighboursEx = 0.0;
           
            forAll (neighbourCell, cellj)
            {
                labelList neighboursNeighbour = neighbour[neighbourCell[cellj]];
                scalar neighboursNeighbourCellVolumes = 0.0;
        
                forAll (neighboursNeighbour, cellk)
                {
                    neighboursNeighbourCellVolumes +=
                        cellVolumes[neighboursNeighbour[cellk]];
                }

                neighboursEx +=
                    alphaEx[neighbourCell[cellj]]*cellVolumes[celli]
                   /neighboursNeighbourCellVolumes;
            }

            alpha[celli] += neighboursEx - alphaEx[celli];
        }
    }

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