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Reference Guide
This manual provides a detailed list and usage information regarding input entries, output entries, and parameters available in OptiStruct.
Input Data
Subcase Information Entries by Function
Descriptions for individual Subcase Information Entries can be accessed by selecting from the links for each entry, listed below in groups according to their purpose and alphabetically on the Subcase Information Section page.

Welcome
What's New
View new features for OptiStruct 2024.1.
Overview
OptiStruct is a proven, modern structural solver with comprehensive, accurate and scalable solutions for linear and nonlinear analyses across statics and dynamics, vibrations, acoustics, fatigue, heat transfer, and multiphysics disciplines.
Tutorials
Discover OptiStruct functionality with interactive tutorials.
User Guide
This manual provides detailed information regarding the features, functionality, and simulation methods available in OptiStruct.
Reference Guide
This manual provides a detailed list and usage information regarding input entries, output entries, and parameters available in OptiStruct.
- Input Data
  - Bulk Data Input File
    The input file in OptiStruct is composed of three distinct sections.
  - I/O Options and Subcase Information Entries Guidelines
    The following guidelines apply to all entries in the I/O Options and Subcase Information sections.
  - Bulk Data Guidelines
    The following guidelines apply to all entries in the Bulk Data Entry section.
  - Solution Sequences - Data Selectors
    The Data Selectors table is available in an Excel spreadsheet.
  - Supported Optimization Type Chart
    Supported types of optimization for various analysis sequences are outlined.
  - I/O Options Defaults Summary
  - I/O Options by Function
    Descriptions for individual I/O Option Entries can be accessed by selecting from the links for each entry, listed below in groups according to their purpose and alphabetically on the I/O Options section page.
  - Subcase Information Entries by Function
    Descriptions for individual Subcase Information Entries can be accessed by selecting from the links for each entry, listed below in groups according to their purpose and alphabetically on the Subcase Information Section page.
  - Bulk Data Entries by Function
    Guidelines for using Bulk Data Entries are listed in Bulk Data Guidelines.
  - I/O Options Section
    Alphabetical listing of the I/O Options Entries.
  - Subcase Information Section
    Alphabetical listing of the Subcase Information Entries.
  - Bulk Data Section
    Alphabetical listing of the Bulk Data Entries.
  - Element Quality Check
    In order to prevent analyses from being carried out on badly discretized models, an element quality check is incorporated into the pre-processing phase.
  - Material Property Check
    In order to prevent analyses from being carried out on models with poor material definitions, a material property check is incorporated into the pre-processing phase. The material property check is controlled by the CHECKMAT parameter (see the PARAM input format).
- Output Data
- Legacy Data
Example Guide
The OptiStruct Example Guide is a collection of solved examples for various solution sequences and optimization types and provides you with examples of the real-world applications and capabilities of OptiStruct.
Verification Problems
This manual presents solved verification models including NAFEMS problems.
Frequently Asked Questions
This section provides quick responses to typical and frequently asked questions regarding OptiStruct.

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Subcase Information Entries by Function

Descriptions for individual Subcase Information Entries can be accessed by selecting from the links for each entry, listed below in groups according to their purpose and alphabetically on the Subcase Information Section page.

For more information on solution sequences, see the table included on the Solution Sequences - Data Selectors page of the online help.


Function Type	Subcase Information Entry
General	ANALYSIS CNTITF CNTLCK CNTSTB EDEM FSI INIPS INISTRS	LABEL MASSSET MODCHG REPCASE STEADY SUBCASE SUBCOM SUBSEQ
Format Controls	POST
MBD Analysis	INVEL MBSIM	MLOAD MOTION
Optimization	DESOBJ DESSUB DESVAR ESLTIME MINMAX or MAXMIN MODEWEIGHT	MODTRAK NORM REPGLB REPSUB WEIGHT
Component Mode Synthesis (Flexible-body Preparation)	CMSMETH	SEINTPNT
Fatigue Analysis	FATDEF FATPARM	FATSEQ
FE Analysis	A2GG ADIABATIC AESYMXY AESYMXZ B2GG BASELIN CMETHOD CNTNLSUB CONVG DEFORM DIVERG DLOAD EIGVRETRIEVE EIGVSAVE EXCLUDE FLLWER FMETHOD FREQUENCY GROUNDCHECK IC IMPERF INLTVEL JOULE K2GG K2PP K42GG LOAD LOADJG M2GG METHOD MFLUID MODESELECT MOTNJG MPC NLADAPT NLCTRL	NLENRG NLMON NLOUT NLPARM NLPRINT NONLINEAR NSGE NSM P2G P2GSUB PEAKOUT PRETENSION RADSND RANDOM RESVEC RSPEC SDAMPING SEALL SEDR SOLVTYP SPC SPCP STATSUB SUPER SUPORT1 TEMPERATURE THIST TRIM TSTEP TSTEPE TSTEPNL TSTRU VISCO WEIGHTCHECK
Rotor Dynamics	RGYRO
Subcase Specific Modeling	GLOBSUB IDGLOBAL	LOCATE SUBMODEL