Enables particles to interact with mesh faces (decsribed using faceZones).

    faceInteraction1
    {
        type            faceInteraction;
        faceZones
        (
            (blockageFaces    stick)
//            (blockageFaces    escape)
//            (blockageFaces    rebound) // not applicable for this test case (!)
        );

        dMin            0;
        dMax            1;
    }

The faceZones entry is a list of (faceZoneName interactionType), where
interaction type is either stick, escape or rebound.