    Info<< "Reading field p_rgh\n" << endl;
    volScalarField p_rgh
    (
        IOobject
        (
            "p_rgh",
            runTime.timeName(),
            mesh,
            IOobject::MUST_READ,
            IOobject::AUTO_WRITE
        ),
        mesh
    );

    Info<< "Reading field U\n" << endl;
    volVectorField U
    (
        IOobject
        (
            "U",
            runTime.timeName(),
            mesh,
            IOobject::MUST_READ,
            IOobject::AUTO_WRITE
        ),
        mesh
    );

    #include "createPhi.H"

    immiscibleIncompressibleThreePhaseMixture mixture(U, phi);

    volScalarField& alpha1(mixture.alpha1());
    volScalarField& alpha2(mixture.alpha2());
    volScalarField& alpha3(mixture.alpha3());

    const dimensionedScalar& rho1 = mixture.rho1();
    const dimensionedScalar& rho2 = mixture.rho2();
    const dimensionedScalar& rho3 = mixture.rho3();

    dimensionedScalar D23(mixture.lookup("D23"));

    // Need to store rho for ddt(rho, U)
    volScalarField rho
    (
        IOobject
        (
            "rho",
            runTime.timeName(),
            mesh,
            IOobject::READ_IF_PRESENT
        ),
        alpha1*rho1 + alpha2*rho2 + alpha3*rho3,
        alpha1.boundaryField().types()
    );
    rho.oldTime();


    // Mass flux
    // Initialisation does not matter because rhoPhi is reset after the
    // alpha solution before it is used in the U equation.
    surfaceScalarField rhoPhi
    (
        IOobject
        (
            "rhoPhi",
            runTime.timeName(),
            mesh,
            IOobject::NO_READ,
            IOobject::NO_WRITE
        ),
        rho1*phi
    );


    // Construct incompressible turbulence model
    autoPtr<incompressible::turbulenceModel> turbulence
    (
        incompressible::turbulenceModel::New(U, phi, mixture)
    );


    Info<< "Calculating field g.h\n" << endl;
    volScalarField gh("gh", g & mesh.C());
    surfaceScalarField ghf("ghf", g & mesh.Cf());

    volScalarField p
    (
        IOobject
        (
            "p",
            runTime.timeName(),
            mesh,
            IOobject::NO_READ,
            IOobject::AUTO_WRITE
        ),
        p_rgh + rho*gh
    );

    label pRefCell = 0;
    scalar pRefValue = 0.0;
    setRefCell
    (
        p,
        p_rgh,
        pimple.dict(),
        pRefCell,
        pRefValue
    );

    if (p_rgh.needReference())
    {
        p += dimensionedScalar
        (
            "p",
            p.dimensions(),
            pRefValue - getRefCellValue(p, pRefCell)
        );
        p_rgh = p - rho*gh;
    }
