Restart Files

Output restart files controls the creation of binary checkpoint files used to restart simulations, including their timing, conditional output, and retention, balancing disk usage with recovery capability.

Output Panel

General

These files are used to restart a simulation. In addition to these user-specified intervals, a final checkpoint file is produced at the last simulation time step. Checkpoint files are binary internal files that cannot be visualized or post-processed. Data for post-processing is printed at the Data, Slice, and Volume Output Intervals. In general, the checkpoint interval can be much larger than any output data frequency.

Write Interval

s | The interval at which to save checkpoint files.

Output Condition

Restart data can be output ad hoc at runtime. Use this expression to set the “output” variable to true at specific times.

Start Time

s | Start time of writes.

Number of Restarts Kept

Number of the most result check point files to keep. The solver retains only this number check points in order to save disk space. For example if this value is set to 3, when the solver writes the 4th restart file, the oldest restart file will deleted, in order to maintain a maximum of 3 check point files.