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Transient or Steady-state?

  • This is the first and perhaps the biggest decision in CFD.
  • Steady-state simulation computes the fully developed solution that does not change in time.
  • When steady-state used the mean values are computed.
  • The steady-state simulation is the way faster than transient.
  • Transient simulation computes the instantaneous values in each time for each quantity.
  • Transient simulation has much higher requirements comparing to steady-state. The CPU time, disk storage, evaluating results, …
  • The results of transient simulation may be more comprehensive.