FoamFile { version 2.0; format ascii; class volVectorField; object U; }
dimensions [0 1 -1 0 0 0 0]; internalField uniform (0.5 0 0);
boundaryField {
    bottom  { type noSlip; }
    top     { type fixedValue; value uniform (1 0 0); }
    cyclic1 { type cyclic; }
    cyclic2 { type cyclic; }
    frontAndBack { type empty; }
}
