• –i input_dir—Specifies the location of the directory containing the engine input files. This is the directory with the same name as the design study you are running. The directory is the same as the directory for output files you specify on the Run Settings dialog box. By default, Creo Simulate places this directory in the current directory.

• –w working_dir1;working_dir2;...—Specifies the location of the directory or directories in which the engine places temporary files during the run. For more information, see –w working_dir1;working_dir2;.... Be aware of Restrictions When Specifying Multiple Working Directories.

• –solram ram_size—Specifies the amount, in megabytes, of memory to be allocated for direct solver memory and for element data for the iterative solver. This option when used overrides any values specified for the –elram and –bsram options. If you do not use the –solram option, solver memory is 512 megabytes by default.

• –iter n—Specifies that the engine uses the iterative solver after polynomial pass n, a number from 1 to 8. For more information on the iterative solver, see Select the Solver.

• –sturm option—Specifies whether or not the Structure engine performs a Sturm sequence test for a modal analysis. By default, the engine performs this test in certain situations to ensure that it has identified the correct number of modes of vibration. The configuration option sim_sturm_sequence controls whether the —sturm always or–sturm never command line option is included in the msengine command in both inline and batch mode.

◦ –sturm default—Equivalent to giving no –sturm command line option. Creo Simulate performs a Sturm sequence test only for those modal analyses that include a search for rigid body modes. For nearly all models, Creo Simulate correctly identifies all of the modes of vibration when you use this option.

◦ –sturm always—Creo Simulate performs a Sturm sequence test for all modal analyses, which may significantly increase execution time.

◦ –sturm never—Creo Simulate does not perform a Sturm sequence test for any modal analyses.

• –extopt—Specifies that Creo Simulate uses an external optimizer to run either a function evaluation (using a standard study) or a gradient evaluation (using a local sensitivity study). For more information, see Use External Optimizers.

• –ascii—Specifies that the engine writes the engine output files in ASCII format.

• –p password—Specifies an optional password.

• –bsram ram_size—Specifies the amount, in megabytes, of block solver RAM the engine uses for equation solving. The value must be greater than 0.1. If you do not specify a value, or if you omit this option, the engine allocates 8 megabytes by default.

◦ This allocation and the –elram allocation represent part of the memory the engine uses to run a design study. The engine dynamically allocates the rest of the memory it needs for the run.

◦ You can use the default allocation for any run. If you have a lot of RAM on your machine, large models will run faster if you specify a higher RAM. You can slow the run substantially if you specify an allocation that is too large to fit in available RAM.

◦ You can also slow the run if you do not specify sufficient space, especially if you specify less than the default.

◦ As a general guideline for large models, set this value to one-half of your machine RAM if you do not use the -iter option, and to one-quarter of your machine RAM if you do use the -iter option. The optimal value also depends on other factors, such as what other processes are running on your machine.

◦ For more information, see Setting Up a Run.

• –elram ram_size—Specifies the amount, in megabytes, of RAM available to store element matrices created by the iterative solver. This option is only relevant if you are also using the -iter option. The value must be greater than 0.1. If you do not specify a value, or if you omit this option, the engine allocates 2 megabytes by default.

◦ This allocation and the –bsram allocation represent part of the memory the engine uses to run a design study. The engine dynamically allocates the rest of the memory it needs for the run.

◦ You can increase the speed of the iterative solver by increasing the amount of RAM you allocate with this option.

◦ As a general guideline, set this value to one-quarter of your machine RAM. Do not set this value to more than half of your workstation installed RAM. The optimal value also depends on other factors, such as what other processes are running on your machine.

• –massnorm—Specifies that the Structure engine mass-normalizes mode shape vectors instead of unit-normalizing them in modal analysis. The configuration option sim_massnorm_modes controls whether this command line option is included in the msengine command in both inline and batch mode.

• –no_supercon_recovery—Suppresses superconvergent stress recovery. The configuration option sim_supercon_recovery controls whether this command line option is included in the msengine command in both inline and batch mode.

• –contact_penetration pen_percent—Specifies the allowable penetration percentage for contact analyses. It can have values from 1 to 100.

• –results_io_cache_size <size>—Specifies the size of the results IO cache in kilobytes. When you run an analysis, the engine writes the results input and output file data first to the cache memory and then to disk. The value you specify here must be an exact power of 2. For example —2^9 (512), 2^10 (1024), 2^11 (2048). This number must be chosen judiciously, because a too high value could degrade the performance. Increase this value only if you have a very large model in which the number of equations exceeds 500,000. The default value for this option is 1024 kilobytes of data.

• –results_always—Forces postprocessing during SPA pass 1 in an analysis. The configuration option sim_results_on_first_pass controls whether this command line option is included in the msengine command in both inline and batch mode.

• –pmax n—Specifies the maximum p-order in a transient thermal analysis. The value of n is between 3 and 9.

• –no_pert—Suppresses perturbation solvers. The configuration option sim_perturbation_solvers controls whether this command line option is included in the msengine command in both inline and batch mode.

• –asm_elm_fix_p_order_off—Fixes the p-order in assembly elements.

• –sim_accurate_asm_links—Forces assembly link calculations to take into account the separation of linked shells. The configuration option sim_accurate_asm_links controls whether this command line option is included in the msengine command in both inline and batch mode.