Moving grid
        Numerical grid usually defined by:
             - Cell definition: CellNo + 8xVertNo
            - Vertex definit.: VertNo + 3Coord.
            - Region defin:   RegNo + 4xVertNo
To move grid – redefine vertices
       Depending on the direction of rotation move all layers for
And assign appropriate coordinate position to each vertex in each layer.
By this means, in each time step rotors are rotated for: