Restarting

Restarting solutions saves solving time by letting you reuse previously computed results. You can use the computed results to start a nonlinear solve with results from a previous solve. For example, using existing computation files (restart results), you can do the following:

• Troubleshoot the convergence of unstable models by starting from the last converged state with new solver parameters, such as activating or deactivating contact, or adjusting time step increments. Each time you use the restart results to solve the solution, you can also save new restart results. Thus, as you adjust solver parameters and the solution progresses further before failing to converge, the .op2 file contains the cumulative results up to the newest time step that failed to converge.

• Solve static computations one time and then reuse the results.For example, if your analysis has both static and dynamic subcases, after you compute the static subcase to build the stiffness matrix, you can start new analyses that use that stiffness matrix.Or, after a structural analysis, you might perform a coupled thermal-structural analysis using the same structural loads and constraints.

Restarts are available for Multiphysics when the analysis type is Structural or Coupled Thermal-Structural. Only the structural results are available for the restart point.

Restarting, Simcenter 3D 2021.1 Series

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