Set final values

This facility can only be used in Parameter mode.

Overview

One of the common problems of simulation is finding suitable values for the initial values of state variables. If the values set are unsuitable, there will be fast transient behavior at the start of the simulation. This will mean a slow start to the simulation. In addition the transient behavior may show up on plots, which would be undesirable.

There are a number of solutions to this problem:

• It may be appropriate to select the option of a stabilizing run followed by a dynamic run. This may also result in a slow start to the run and would have to be repeated for every run.

• Use the run parameters option Use old final values, but this would have to be repeated for every run.

• Use the Set final values utility. Simcenter Amesim will read the corresponding .results file, extract the final values of the state variables and use them to overwrite their current initial values. The Set final values utility is similar to the run option Use old final values. However, it is permanent since the old initial values are overwritten. But you can always save the original parameter set of the system, as explained below.

Procedure

Procedure

1. Select Configure > Set final values.

The dialog box below appears:

2. If you click on:

Yes, the state variable initial values are overwritten by the final values of the previous simulation which are extracted from the .results file. In this case, the original initial values are lost.

No, the procedure is canceled.

Save, the dialog box below appears and you have the opportunity to save the current system set of parameters before the state variable initial values are overwritten. In this case, the original initial values can be restored.

For more details on saving and loading a system parameter set, please refer to System parameters

Results

If the .results file does not exist, cannot be read or Simcenter Amesim thinks the system has been changed so the values in this file are no longer appropriate, a suitable warning message is displayed: