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Reference Guide
This manual provides a detailed list of all the input keywords and options available in Radioss.
Optimization Keywords
Optimization Keyword This manual contains the description of the keywords for the Radioss optimization. This manual is compatible with the version 2018 of Radioss.
Design Constraints
Optimization Keyword In this group, keywords are used to define the design constraints.

Welcome
What's New
View new features for Radioss 2024.
Overview
Radioss^® is a leading explicit finite element solver for crash and impact simulation.
Tutorials
Discover Radioss functionality with interactive tutorials.
User Guide
This manual provides details on the features, functionality, and simulation methods available in Altair Radioss.
Reference Guide
This manual provides a detailed list of all the input keywords and options available in Radioss.
- File Extensions and Formats
  Current Radioss format uses the 12x extension format.
- Single File Input
  This format allows running either Starter or Engine with the same file.
- New Keywords in 2024
  New and modified features in Radioss.
- Starter Input
  This manual provides a list of all the model definition keywords and options available in Radioss.
- Engine Input
  This manual provides a list of all the solution definition keywords and options available in Radioss.
- LS-DYNA Input
  This manual provides a list of LS-DYNA input files available in Radioss.
- Optimization Keywords
  Optimization Keyword This manual contains the description of the keywords for the Radioss optimization. This manual is compatible with the version 2018 of Radioss.
  - Bulk Data
    Optimization Keyword This group of keywords are used to insert Bulk format data into <name>.radopt file.
  - Design Constraints
    Optimization Keyword In this group, keywords are used to define the design constraints.
    - /DCOMP
      Optimization Keyword Defines manufacturing constraints for composite sizing optimization.
    - /DCONSTR
      Optimization Keyword This keyword constrains a design response by specifying its lower and upper bounds. The response is defined by a /DRESP1 entry.
  - Design Response
    Optimization Keyword In this group, keywords are used to define the design response in optimization.
  - Design Variables
    Optimization Keyword In this group, keywords are used to define the design variable in optimization.
  - /DEQATN
    Optimization Keyword Specifies one or more equations for use in optimization.
  - /DESOBJ
    Optimization Keyword This keyword can be used to select a response as the objective function of an optimization run by selecting a response as the objective function. The selected response can either be minimized or maximized based on the inputs specified on this keyword.
  - /DTABLE
    Optimization Keyword List of constants to be used in functions defined by /DEQATN.
  - /DVGRID
    Optimization Keyword Defines the relationship between design variable and grid point location.
  - /ESLPART
    Optimization Keyword Defines parts in the model which will be included in ESLM optimization.
- Multi-Domain
  This manual contains the description of the keywords for the Radioss Multi-Domain.
- Other Files
- Definition
Example Guide
This manual presents examples solved using Radioss with regard to common problem types.
Verification Problems
This manual presents solved verification models.
Frequently Asked Questions
This section provides quick responses to typical and frequently asked questions regarding Radioss.
Theory Manual
This manual provides detailed information about the theory used in the Altair Radioss Solver.
User Subroutines
This manual describes the interface between Altair Radioss and user subroutines.

Design Constraints

Optimization Keyword In this group, keywords are used to define the design constraints.