Conclusions

• Kinds of mathematical problems:
  • equation with several solutions (1)
  • undefined initial or restart values (2)
  • insufficient start values for Newton solver (4)
  • function with several values at the same point (3)
• Neglected physical effects:
  • propagation time of signals (1,3)
  • switching time of states (3)
  • mass inertia (2,4)
• Handling of additional parameters:
  • aggregate in one place (1)
  • reuse one value or define default value (2,4)
  • use abstract replacement (3)
• What to do, when the simulator strikes (and it is not a bug):
  • isolate mathematical problem
  • find physical cause
  • model the missing physics as simple as possible
  • avoid the introduction of many new parameters