one3d.rea
3                      spatial dimension
1                      number of fields:   velocity + temperature
#========================================================================
#
#  Comments:
#
#  This is an example where genbox is used to generate a 2D annulus.
#  We have 4 elements in the r direction and 12 in theta.
#
#  Boundary conditions are "Wall" ("W") for velocity and fortran
#  function "t" for temperature, which is set in userbc() in the .usr file.
#
#========================================================================
#
Circle
0.  0.                      xctr,yctr
50   -160  22                 nelr,nel_theta,nelz for annular mesh
0.4000  0.4100  0.4215  0.4347  0.4499  0.4674  0.4890  0.5107  0.5323  0.5539  0.5756  0.5972  0.6188  0.6404  0.6621  0.6837
0.7053  0.7270  0.7486  0.7702  0.7918  0.8135  0.8351  0.8567  0.8784  0.9000  0.9216  0.9433  0.9649  0.9865  1.0081  1.0298
1.0514  1.0730  1.0947  1.1163  1.1379  1.1596  1.1812  1.2028  1.2245  1.2461  1.2677  1.2893  1.3110  1.3326  1.3501  1.3653 
1.3785  1.3900  1.4000 
0.0  360.  1.0              @0 @1 ratio 
0.000  0.0100  0.0215  0.0347  0.0499  0.0674  0.0728  0.0783  0.0837  0.0891  0.0946  0.1000  0.1054  0.1109  0.1163  0.1217  
0.1272  0.1326  0.1501  0.1653  0.1785  0.1900  0.2000
v  ,v  ,   ,   ,v  ,v     Velocity BCs  (here, only at r0 and rn)