Defining Time Incrementation Options

You can define controls to fine-tune how time progresses using a transient flow step. If you choose to increment time automatically, as opposed to using a fixed time step, you can define additional controls to scale the stable time step from an initial time increment you specify.

Important: These controls are intended for expert users.

Before you begin:
  • Define a transient flow step. For more information, see Defining a Transient Flow Step.
  • Specify automatic or fixed time incrementation.
  • Expand the Time incrementation section of your step.
See Also
About Transient Flow Time Incrementation
  1. If you specified automatic time incrementation, specify the following:
    1. Enter a value for the Initial time increment, which is the suggested initial time increment.
    2. Enter a value for the Scale factor, which scales the stable time step.
    3. Enter a value for the Stable time step size interval, which is the interval at which to check the stable time step.
    4. Enter a value for the Maximum time increment, which is the maximum allowable length of time for each increment.
  2. Enter a value for the Maximum fixed point iterations, which is the number of fixed point iterations that are performed if convergence within a time step is not achieved before the analysis stops and proceeds to the next time step.
  3. Enter a value for the Fixed point iteration error threshold, which is the error threshold below which iterations within the time step will stop.