alphaEqnSubCycle.H

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{
    surfaceScalarField alphaPhi
    (
        IOobject
        (
            "alphaPhi",
            runTime.timeName(),
            mesh
        ),
        mesh,
        dimensionedScalar("0", phi.dimensions(), 0)
    );

    surfaceScalarField phir(fvc::flux(UdmModel.Udm()));

    if (nAlphaSubCycles > 1)
    {
        dimensionedScalar totalDeltaT = runTime.deltaT();
        surfaceScalarField alphaPhiSum
        (
            IOobject
            (
                "alphaPhiSum",
                runTime.timeName(),
                mesh
            ),
            mesh,
            dimensionedScalar("0", phi.dimensions(), 0)
        );

        for
        (
            subCycle<volScalarField> alphaSubCycle(alpha1, nAlphaSubCycles);
            !(++alphaSubCycle).end();
        )
        {
            #include "alphaEqn.H"
            alphaPhiSum += (runTime.deltaT()/totalDeltaT)*alphaPhi;
        }

        alphaPhi = alphaPhiSum;
    }
    else
    {
        #include "alphaEqn.H"
    }

    // Apply the diffusion term separately to allow implicit solution
    // and boundedness of the explicit advection
    {
        fvScalarMatrix alpha1Eqn
        (
            fvm::ddt(alpha1) - fvc::ddt(alpha1)
          - fvm::laplacian(turbulence->nut(), alpha1)
        );

        alpha1Eqn.solve(mesh.solver("alpha1Diffusion"));

        alphaPhi += alpha1Eqn.flux();
        alpha2 = 1.0 - alpha1;

        Info<< "Phase-1 volume fraction = "
            << alpha1.weightedAverage(mesh.Vsc()).value()
            << "  Min(" << alpha1.name() << ") = " << min(alpha1).value()
            << "  Max(" << alpha1.name() << ") = " << max(alpha1).value()
            << endl;
    }

    rhoPhi = alphaPhi*(rho1 - rho2) + phi*rho2;
    rho = mixture.rho();
}