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

    Info<< "Reading field gamma\n" << endl;
    volScalarField gamma
    (
        IOobject
        (
            "gamma",
            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"


    Info<< "Reading transportProperties\n" << endl;
    twoPhaseMixture twoPhaseProperties(U, phi, "gamma");

    const dimensionedScalar& rho1 = twoPhaseProperties.rho1();
    const dimensionedScalar& rho2 = twoPhaseProperties.rho2();


    // Need to store rho for ddt(rho, U)
    volScalarField rho
    (
        IOobject
        (
            "rho",
            runTime.timeName(),
            mesh,
            IOobject::READ_IF_PRESENT
        ),
        gamma*rho1 + (scalar(1) - gamma)*rho2,
        gamma.boundaryField().types()
    );
    rho.oldTime();


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


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


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


    label pdRefCell = 0;
    scalar pdRefValue = 0.0;
    setRefCell(pd, mesh.solutionDict().subDict("PISO"), pdRefCell, pdRefValue);

    scalar pRefValue = 0.0;

    if (pd.needReference())
    {
        pRefValue = readScalar
        (
            mesh.solutionDict().subDict("PISO").lookup("pRefValue")
        );

        p += dimensionedScalar
        (
            "p",
            p.dimensions(),
            pRefValue - getRefCellValue(p, pdRefCell)
        );
    }

    // Construct interface from gamma distribution
    interfaceProperties interface(gamma, U, twoPhaseProperties);