foam-extend4.1-coherent-io/applications/solvers/solidMechanics/stressFemFoam/createFemFields.H

    // Create displacement field
    tetPointVectorField U
    (
        IOobject
        (
            "U",
            runTime.timeName(),
            mesh,
            IOobject::MUST_READ,
            IOobject::AUTO_WRITE
        ),
        tetMesh
    );