---
solver:
  mechanical: spectral_basic

loadstep:
  - boundary_conditions:
      mechanical:
        dot_F: [x, 0,      0,
                0, 1.0e-3, 0,
                0, 0,      x]
        P: [0, x, x,
            x, x, x,
            x, x, 0]
    discretization:
      t: 20
      N: 40
    f_out: 4