foam-extend4.1-coherent-io/applications/solvers/incompressible/boundaryFoam/createFields.H

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


    Info<< "Creating face flux\n" << endl;
    surfaceScalarField phi
    (
        IOobject
        (
            "phi",
            runTime.timeName(),
            mesh,
            IOobject::NO_READ,
            IOobject::NO_WRITE
        ),
        mesh,
        dimensionedScalar("zero", mesh.Sf().dimensions()*U.dimensions(), 0.0)
    );


    singlePhaseTransportModel laminarTransport(U, phi);

    autoPtr<incompressible::RASModel> turbulence
    (
        incompressible::RASModel::New(U, phi, laminarTransport)
    );


    IOdictionary transportProperties
    (
        IOobject
        (
            "transportProperties",
            runTime.constant(),
            mesh,
            IOobject::MUST_READ_IF_MODIFIED,
            IOobject::NO_WRITE
        )
    );

    dimensionedVector Ubar
    (
        transportProperties.lookup("Ubar")
    );

    vector flowDirection = (Ubar/mag(Ubar)).value();
    tensor flowMask = sqr(flowDirection);

    dimensionedVector gradP
    (
        "gradP",
        dimensionSet(0, 1, -2, 0, 0),
        vector(0, 0, 0)
    );