Solvers vs Supported Solution Sequences
The Solvers supported in OptiStruct, in conjunction with the Solution Sequences in which they can be utilized.
| Subcase Type | BCS | MUMPS | PCG | PARDISO | AMSES | Lanczos | AMLS | LAPACK | FASTFR | FastFRS |
|---|---|---|---|---|---|---|---|---|---|---|
| Linear Static Analysis (STATICS) | Default | Optional | Optional | Optional | N/A | N/A | N/A | N/A | N/A | N/A |
| Nonlinear Static Analysis (NLSTAT) | Optional | Default | Optional | Optional | N/A | N/A | N/A | N/A | N/A | N/A |
| Eigenvalue Analysis (MODES) | Optional | Optional | N/A | Optional | Optional | Default | Optional | N/A | N/A | N/A |
| Linear Buckling Analysis (BUCK) | Optional | Optional | N/A | Optional | N/A | Default | N/A | N/A | N/A | N/A |
| Modal Frequency Response Analysis (MFREQ) | Optional | Optional | Optional | Optional | Optional | Default | Optional | Default | Optional | Optional |
| Direct Frequency Response Analysis (DFREQ) | Default | Optional | N/A | Optional | N/A | N/A | N/A | N/A | N/A | N/A |
| Direct Transient Response through Fourier Transformation (DFOUR) | Default | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A |
| Linear Modal Transient Response through Fourier Transformation (MFOUR) | N/A | N/A | N/A | N/A | Optional | Default | Optional | Default | Optional | Optional |
| Linear Direct Transient Response Analysis (DTRAN) | Default | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A |
| Nonlinear Direct Transient Analysis | Optional | Default | N/A | Optional | N/A | N/A | N/A | N/A | N/A | N/A |
| Modal Transient Response Analysis | Optional | Optional | Optional | Optional | Optional | Default | Optional | N/A | N/A | N/A |
| Modal Complex Eigenvalue Analysis (MCEIG) | N/A | N/A | N/A | N/A | Optional | Default | Optional | N/A | N/A | N/A |
| Linear Heat Transfer Analysis (HEAT) | Default | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A |
| Nonlinear Heat Transfer Analysis (NLHEAT) | Default | Optional | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A |
| Component Mode Synthesis (CMSMETH) | N/A | N/A | N/A | N/A | Optional | Default | Optional | N/A | N/A | N/A |
The various static solvers are available as options on the SOLVTYP Bulk Data Entry. Eigensolver selections for Eigenvalue Analysis are done via the EIGRA/EIGRL Bulk Data Entries. PARAM, AMLS can be used to toggle AMLS on or off. FASTFR and FASTFRS can be used for Modal Frequency Response Analysis and are activated using PARAM, FASTFR and PARAM, FASTFRS respectively (the default for Modal solution is LAPACK). Solvers can be selected based on the type of analysis or optimization runs.