fast-convection:
  rho: 1
  thermal:
    c_p: 1
    K_11: 1e30
    K_22: 1e30
    K_33: 1e30
    source:
      - type: externalheat
        f_T: [1, 1, 0, 0]
        t_n: [0, 500, 500.001, 1000]