U

Example from tutorial Plate2D:

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  3.0.1                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       volVectorField;
    location    "0";
    object      U;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions      [0 1 -1 0 0 0 0];

internalField   uniform (0 0 0);

boundaryField
{
    frontAndBack{
        type            slip;
    }
    lowerWall
    {
        type            slip;

    }
    atmosphere
    {
        type pressureInletOutletVelocity;
        phi phi;
        rho rho;
        tangentialVelocity uniform (0 0 0);
        value uniform (0 0 0.5);
    }

    "defaultFaces|rightWall|leftWall"
    {
        type            empty;
    }
}


// ************************************************************************* //