Indicates the level of difficulty of the analysis. Valid settings are AUTO or 0 (default), 1, 2, 3, 4, or 5. This option applies to both the PCG solver when used in static and full transient analyses and to the PCG Lanczos method in modal analyses. Use AUTO to let ANSYS automatically choose the proper level of difficulty for the model. Lower values (1 or 2) generally provide the best performance for well-conditioned problems. Values of 3 or 4 generally provide the best performance for ill-conditioned problems; however, higher values may increase the solution time for well-conditioned problems. Higher level-of-difficulty values typically require more memory. Using the highest value of 5 essentially performs a factorization of the global matrix (similar to the sparse solver) and may require a very large amount of memory. If necessary, use Memory to reduce the memory usage when using Lev_Diff = 5. Lev_Diff = 5 is generally recommended for small- to medium-sized problems when using the PCG Lanczos mode extraction method.

For example, models containing elongated elements (i.e., elements with high aspect ratios) and models containing contact elements can lead to ill-conditioned problems. To determine if your problem is ill-conditioned, view the Jobname.PCS file to see the number of PCG iterations needed to reach a converged solution. Generally, static or full transient solutions that require more than 1500 iterations are considered to be ill-conditioned for the PCG solver.

Unused field.

Controls whether the PCG solver will attempt to reduce I/O performed during equation solution:

This option applies to both the PCG solver when used in static and full transient analyses and to the PCG Lanczos method in modal analyses.

Controls whether or not a Sturm sequence check is performed:

This option applies only when using the PCG Lanczos method in modal analyses. When using this option, a factorization must be performed and will require a very large amount of memory for extra computations. This option is generally recommended for small- to medium-sized problems. If the Sturm sequence check takes a large amount of computing time, use the Jobname.ABT file to abort the Sturm check, or press the STOP button if in interactive mode.

Controls whether or not the .FULL file is written.

This option applies only when using the PCG Lanczos method in modal analyses because the .FULL file is never written when using the PCG solver in static or full transient analyses.

If using MSAVE,ON and conditions for the MSAVE command are met, a complete .FULL file is never written regardless of this option.

If constraint equations are present in the model, a .FULL file is always written regardless of this option.

This option is useful in Distributed ANSYS because assembling the global stiffness and mass matrices on the master machine before writing the .FULL file can take a considerable amount of memory. By setting Wrtfull = OFF, this assembly process is skipped on the master machine, decreasing the amount of memory required to compute the modes and mode shapes. Wrtfull = OFF does not affect the results for the modes and mode shapes. However, without a .FULL file, the participation factor table computations do not occur.

To generate the .FULL file, such as for a harmonic, transient mode-superposition, or spectrum analysis, rerun the modal analysis with Wrtfull = ON, or use the WRFULL command.

Controls whether to run using in-core or out-of-core mode when using Lev_Diff = 5.

This option applies to both the PCG solver when used in static and full transient analyses and to the PCG Lanczos method in modal analyses. However, this option only applies when using Lev_Diff = 5 and does not apply to Distributed ANSYS. Forcing the INCORE option will require a large amount of memory and is only recommended for small-to-medium sized problems. Using the OOC option will make the PCG solver use the least amount of memory (relative only to Lev_Diff = 5) at the cost of additional I/O, which will likely decrease performance as compared to an in-core run.

Controls use of the PCG solver for MPC184 Lagrange multiplier method elements. This option applies only to the PCG solver when used in static and full transient analyses.

The Lagrange multiplier method used by MPC184 elements transfers into multiple point constraints and, hence, can be solved by the PCG solver. For Lagrange-formulation contact methods, incompressible u-P formulations, and the MPC184 screw joint element, the PCG solver cannot be used and the sparse solver is required. Distributed ANSYS does not support the LM_Key = ON option. The MSAVE command does not support the LM_Key = ON option.