Creo Simulate > Creo Simulate > Running Solvers > Native Mode Solvers > Setting Up a Run > Use Iterative Solver
  
Use Iterative Solver
Select this item to run a study with the iterative solver instead of the direct block solver. The Structure engine uses the direct solver by default because it usually uses less time, disk space, and/or memory than the iterative solver. For more information about choosing a solver and when to use the iterative solver instead of the direct solver, see Select the Solver.
You can use the iterative solver in the following situations:
if you ran out of disk space running a design study using the direct solver
if a run is very time-consuming using the direct solver
if you are running a linear static analysis and your model is a solid
The iterative solver has the following limitations:
If you are running a global sensitivity or optimization design study, you must select Repeat P-Loop Convergence when you create the study.
If you are running a local sensitivity or optimization design study, none of the analyses in the study can have temperature loads in Structure that refer to thermal analyses.
If your design study contains any modal analyses, Creo Simulate does not use the iterative solver for those analyses.
For some models, the iterative solver may not converge. If a design study does not converge, the run terminates, and you must re-run the study without the iterative solver.
When you select this item, the following additional items appear on the dialog box:
Maximum iterations
After P-loop pass