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

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


    label pRefCell = 0;
    scalar pRefValue = 0.0;
    setRefCell(p, simple.dict(), pRefCell, pRefValue);
    mesh.schemesDict().setFluxRequired(p.name());

    singlePhaseTransportModel laminarTransport(U, phi);

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


    MRFZones mrfZones(mesh);
    mrfZones.correctBoundaryVelocity(U);

    // Create Urel as a permanent field to make it available for on-the-fly
    // post-processing operations
    volVectorField Urel
    (
        IOobject
        (
            "Urel",
            runTime.timeName(),
            mesh,
            IOobject::NO_READ,
            IOobject::AUTO_WRITE
        ),
        U
    );
    mrfZones.relativeVelocity(Urel);