Solvers versus 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) | Optional | Default | 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 linear static equation solver for RESVECs | Default linear static equation solver for RESVECs | N/A | Optional linear equation solver for RESVECs | Optional Eigenvalue solver | Default Eigenvalue solver | Optional Eigenvalue solver | N/A | N/A | N/A |
| Linear Buckling Analysis (BUCK) | Optional linear equation solver for RESVECs | Default linear equation solver for RESVECs | N/A | Optional linear equation solver for RESVECs | N/A | Default Eigenvalue solver | N/A | N/A | N/A | N/A |
| Modal Frequency Response Analysis (MFREQ) | Optional linear equation solver for RESVECs | Default linear equation solver for RESVECs | N/A | Optional linear equation solver for RESVECs | Optional Eigenvalue solver for RESVECs | Default Eigenvalue solver | Optional Eigenvalue solver | Default modal solution solver | Optional modal solution solver | Optional modal solution solver |
| Direct Frequency Response Analysis (DFREQ) | Optional | Default | N/A | N/A | 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 |
| Modal Transient Response through Fourier Transformation (MFOUR) | N/A | N/A | N/A | N/A | Optional Eigenvalue solver | Default Eigenvalue solver | Optional Eigenvalue solver | Default modal solution solver | Optional modal solution solver | Optional modal solution solver |
| Linear Direct Transient Response Analysis (DTRAN) | Default for SMP. Optional for DDM. | Default for DDM. Optional for SMP. | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A |
| Nonlinear Direct Transient Analysis | Optional | Default | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A |
| Modal Transient Response Analysis | Optional linear equation solver for RESVECs | Default linear equation solver for RESVECs | N/A | Optional linear equation solver for RESVECs | Optional Eigenvalue solver | Default Eigenvalue solver | Optional Eigenvalue solver | N/A | N/A | N/A |
| Direct Complex Eigenvalue Analysis (DCEIG) | N/A | Default Complex Eigenvalue solver | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A |
| Modal Complex Eigenvalue Analysis (MCEIG) | Optional linear equation solver for RESVECs | Default linear equation solver for RESVECs | N/A | Optional linear equation solver for RESVECs | Optional Real/Complex Eigenvalue solver | Optional Real/Complex Eigenvalue solver | Optional Real/Complex Eigenvalue solver | 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) | Optional | Default | 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 | N/A | N/A | N/A | N/A |
| Electrical Analysis (ELEC) | Optional | Default | N/A | N/A | N/A | N/A | N/A | 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 and 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.