Time Model

This dialog is opened via Computation Menu.

In the Time Model dialog you set pseudo-stationary simulation (default) or time-dependent simulation (Full implicit) and the relative parameters.

In pseudo-stationary simulation, the facility you are using is handled to be in a stationary state. But additionally some things like latent heat, which is released during solidification, are taken into account. Since these features are time-dependent, the model is called pseudo-stationary instead of stationary. All fields are gray when pseudo-stationary is selected.

In time-dependent simulation, the variables are computed at every Time step between Start time and End time. If one time step is solved in less than the number of max. iterations, the following time-step is increased by the Incremental factor. This is done until the value for the max. time step is reached. If one time step takes more iterations than the max. iterations, the following time step is decreased by the decremental factor.

When allow timestep repetition is selected, a time step, which did not converge within the given maximal number of iterations, will be repeated using half the time step size. Otherwise, the calculation will continue as if the step had converged.

The Profile file allows to specify timestep size as a function of time, format are to columns of text, first column specifiying time, second one timestep sizes, which will be linearily interpolated between the given times.

Time Model dialog 

Figure 33. Time Model dialog

Item

Description

Time Model:

  • pseudo-stationary

  • Full Implicit

[parameter list]

All parameters are only used for the time-dependent computation (Full implicit):

  • Start time (s)

  • Stop time (s)

  • Time step (s)

  • Max. time step (s)

  • Max. iterations

  • Incremental factor

  • Decremental factor

Related Procedures

Time Model Choice.