How to Restart a Simulation from the Last Converged Substep in ANSYS APDL

Restarting a simulation from the last converged substep in ANSYS APDL involves a series of steps that ensure the analysis continues seamlessly from the most recent stable state. This process is crucial for accurately capturing the behavior of complex systems and ensuring that the simulation results are reliable.

Steps to Restart Simulation in ANSYS APDL

Save the Database

Before you exit the simulation, it is essential to save the database at a point where the solution has converged. This can be done using the following command:

APDL

SAVE filename db

Prepare the Restart Command

When you want to restart your analysis, use the RESTORE command to load the saved database. This will bring back the last converged state:

APDL

RESTORE filename db

Set Up the Restart

After restoring the database, you will need to specify that you want to continue the analysis from the last converged substep. This can be achieved using the SOLVE command with the CONTINUE option:

APDL

SOLVE CONTINUE

Check Analysis Settings

Ensure that your analysis settings, such as load steps and time increments, are correctly set up to continue from the last state. You may need to adjust parameters depending on what you want to achieve in the restart.

Run the Analysis

After setting everything up, run the analysis. ANSYS will use the last converged results as the starting point for the new analysis.

Example Script

Here’s an example of a simple restart script:

APDL

! Load the databaseRESTORE my_analysis db! Continue the analysis from the last converged substepSOLVE CONTINUE

Important Notes

Ensure that the original analysis and the restart analysis settings are compatible. Changes in loading conditions or material properties might result in errors or non-convergence. Always check the output log for any warnings or errors that might occur during the restart process. If you are using a specific solver or method, consult the ANSYS documentation for any additional parameters that may need to be set for a successful restart.

This process should help you effectively restart your simulation in ANSYS APDL from the last converged substep, ensuring a seamless and accurate continuation of your analysis.