seopt#

AnalysisOptions.seopt(sename='', sematr='', sepr='', sesst='', expmth='', seoclvl='', lpnamekey='', **kwargs)#

Specifies substructure analysis options.

Mechanical APDL Command: SEOPT

Parameters:
senamestr

The name (case-sensitive, 32-character maximum) assigned to the .sub superelement matrix file. This field defaults to Fname on the filname command.

sematrint or str

Matrix generation key:

  • 1 - Generate stiffness (or conductivity) matrix (default).

  • 2 - Generate stiffness and mass (or conductivity and specific heat) matrices.

  • 3 - Generate stiffness, mass and damping matrices.

seprint or str

Print key:

  • 0 - Do not print superelement matrices or load vectors.

  • 1 - Print both load vectors and superelement matrices.

  • 2 - Print load vectors but not matrices.

sesstint or str

Stress-stiffening key:

  • 0 - Do not save space for stress stiffening in a later run.

  • 1 - Save space for the stress stiffening matrix (calculated in a subsequent generation run after the expansion pass).

expmthstr

Expansion method for expansion pass:

  • BACKSUB - Save necessary factorized matrix files (for example, the .LN22 file) for backsubstitution during the subsequent expansion passes (default). This normally results in a large usage of disk space.

  • MODDIR - This is the same expansion method as BACKSUB, except that the static correction vectors (see the first term of in the Mechanical APDL Theory Reference) are stored on the .bclv file instead of the .LN22 file. This option is required when remote read-only file usage is used during the first solution of the first restart of a generation pass (see the moddir command).

  • RESOLVE - Do not save factorized matrix files. Global stiffness matrix will be reformed during expansion pass. This option provides an effective way to save disk space usage. This option cannot be used if the use pass uses large deflections ( nlgeom,ON).

  • NONE - Do not save factorized matrix files. With this option, the expansion pass is not possible when factorized matrix files are required.

  • BCLV - Do not save factorized matrix files. The static correction vectors (see the first term of ) are stored in the .bclv file. With this option, the expansion pass is not possible when factorized matrix files are required.

seoclvlstr

For the added-mass calculation, the ocean level to use when ocean waves ( octype,,WAVE) are present:

  • ATP - The ocean level at this point in time (default).

  • MSL - The mean ocean level.

lpnamekeystr

  • ON - All files created during the generation pass are named using Sename.

  • OFF - All files created during the generation pass are named using the Jobname defined for the analysis (see filname command) except for the .sub file, which uses Sename if specified (default).

Notes

seopt specifies substructure analysis options ( antype,SUBSTR). If used during solution, the command is valid only within the first load step.

When ocean waves ( octype,,WAVE) are present, the SeOcLvL argument specifies the ocean height or level to use for the added-mass calculation, as the use-run analysis type is unknown during the generation run.

The expansion pass method RESOLVE is not supported with component mode synthesis analysis ( cmsopt ). ExpMth is automatically set to BACKSUB for CMS analysis. The RESOLVE method invalidates the use of the numexp command. The RESOLVE method does not allow the restarting of the substructure generation pass and the computation of results based on nodal velocity and nodal acceleration (damping force, inertial force, kinetic energy, etc.) in the substructure expansion pass.

If ExpMth = NONE or BCLV in a substructure analysis or component mode synthesis (CMS) analysis ( cmsopt ) using the fixed-interface ( cmsopt,FIX) or free-interface ( cmsopt ,FREE) methods, you cannot restart the generation pass or perform the expansion pass. (In CMS analyses using those methods, however, the expansion pass is possible when element-results calculation is activated in the generation pass ( ELCALC = YES on cmsopt )). The ExpMth argument is not required for CMS analysis using the residual-flexible free-interface method ( cmsopt,RFFB).

For linear perturbation substructure generation pass with multiple substructures, set LPnameKey = ON to avoid copying files at the end of each generation pass with the copy command. For an example with CMS analysis using the fixed-interface method, see.

This command is also valid in PREP7.