---

step:
  - mechanics:
      dot_F: [1.0e-3, 0, 0,
              0,      x, 0,
              0,      0, x]
      P: [x, x, x,
          x, 0, x,
          x, x, 0]
    discretization:
      t: 10
      N: 40
      f_out: 4
  - mechanics:
      dot_F: [1.0e-3, 0, 0,
              0,      x, 0,
              0,      0, x]
      P: [x, x, x,
          x, 0, x,
          x, x, 0]
    discretization:
      t: 60
      N: 60
      f_out: 4