zz.rea
2                      spatial dimension
1                      number of fields
#
#  Eddy case
#
Box
-16  -16                      nelx,nely,nelz for Box
0   1.  1.                    x0 x1 ratio 
0   1.  1.                    y0 y1 ratio 
W  ,E  ,W  ,W  ,              bc's
#Box 2
Box
-8  -16                      nelx,nely,nelz for Box
1.  2.  1.                    x0 x1 ratio 
0   1.  1.                    y0 y1 ratio 
E  ,W  ,W  ,W  ,              bc's