At t[0] =      0.00e+00 u=       1.00e+00 at the center 
  PostStep, t: 0.1
  PostStep, t: 0.2
  PostStep, t: 0.3
  PostStep, t: 0.4
  PostStep, t: 0.5
  PostStep, t: 0.6
  PostStep, t: 0.7
  PostStep, t: 0.8
  PostStep, t: 0.9
  PostStep, t: 1.
At t[10] =      1.00e+00 u=       4.67e-03 at the center 
  PostStep, t: 1.1