lid velocity = 100., prandtl # = 1., grashof # = 40000.
  0 SNES Function norm 1065.74
  1 SNES Function norm 31.0274
  2 SNES Function norm 1.05573
  3 SNES Function norm 0.127973
  4 SNES Function norm 0.0186555
  5 SNES Function norm 0.00261234
  6 SNES Function norm 0.000352926
  7 SNES Function norm 4.74475e-05
  8 SNES Function norm 6.36238e-06
Number of SNES iterations = 8