foam-extend4.1-coherent-io/tutorials/incompressible/simpleFoam/ERCOFTAC_ConicalDiffuser/addSwirlAndRotation/createFields.H

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