Generate results to reuse with different analyses (external restart)

1. Create your initial run solution with the necessary subcases and output requests. For example, make sure that the solution includes the preload and static stress subcases whose results you want to use in the restart run.For information on creating a solution, see Creating and managing solutions and subcases.

2. Right-click the solution and choose Edit.

3. In the Solution dialog box, on the Restart Management page, set Generate Restart Data to Yes.

4. Right-click the solution and choose Solve.The data for the initial run is saved at the end of each preload, static, and dynamic subcase, and at the last converged time step.

5. View the results in post-processing to determine which subcase you want to restart from and to identify the end time of that subcase.For more information, see Post-processing.

6. If you want to use these results again, rename the .op2 file so that it is not overwritten.

7. In the same Simulation file that you used for the initial run, create a restart solution by doing one of the following, depending on how you want to use the results:To apply the initial run results, such as pre-stress results, to new analyses, create a new solution.To apply the initial run results, such as preload results, to subcases in the same solution, clone the initial run solution by right-clicking the solution and choosing Clone.

8. Give the restart solution a unique name, and add or modify subcases, adjust solver parameters, and so on. For example, you might adjust loads, deactivate contact, and change subcase parameters such as time steps. You cannot, however, modify the mesh or material properties, and you cannot add new contact and glue conditions. If you do so, the solution will fail the model check. For more information, see Adjusting parameters for the restart run.

9. Right-click the restart run solution and choose Edit.

10. In the Solution dialog box, on the Restart Management page, set the following options:From the Generate Restart Data list, select No.From the Restart Option list, select Yes, and click Browse to navigate to the .op2 file from the initial run.From the Restart Subcase list, select the ID of the last subcase whose results you want to use in the restart solution. The subcases that follow the specified restart subcase are solved again.From the Execute Subcase list, select an option to identify the subcase that will start the solution. For results that you want to reuse with different analyses, select one of the following:If you created a new solution, select First Subcase. The solver applies the results of the initial run to the first subcase in the new solution.When you select this option, make sure that the time step of subcase 1 in the new solution is greater than the last time step in the Restart Subcase that you selected in step c.If you cloned the initial run solution, select Restart Subcase ID + 1. This starts the solution with the first subcase that follows the restart subcase. For example, if the restart subcase ID is 3, the solution starts with subcase ID 4, and subcase 4 uses the results of subcase 3.Depending on the analysis types, the subcase IDs and times are evaluated as follows. For preload subcases, the Restart Subcase and Execute Subcase IDs must be equal.For modal subcases, the times of the Restart Subcase and Execute Subcase IDs are not evaluated.For all other subcases, the end time of the Execute Subcase must be greater than the restart point defined by Restart Subcase.

11. Right-click the restart run solution and choose Solve.The .op2 file contains the results for initial run solution and the restart run solution. If you created a new solution, the subcases are renumbered in post-processing. For example, if the initial run results contains two restart subcases, subcase 1 of the new solution becomes subcase 3.

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