FoamFile
{
    version     2.0;
    format      ascii;
    class       volVectorField;
    object      U;
}

dimensions      [ 0 1 -1 0 0 0 0 ];     // 0 m^1 s^-1 0 0 0 0

internalField   uniform ( 2 0 0 );      // x, y, z direction

boundaryField
{
    interface
    {
        type            slip;
    }
    inlet
    {
        type            fixedValue;
        value           $internalField;
    }
    outlet
    {
        type            zeroGradient;
    }
    top
    {
        type            slip;
    }
    bottom
    {
        type            slip;
    }
    slip-bottom
    {
        type            slip;
    }
}