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Reference Guide
This manual provides a detailed list of all the input keywords and options available in Radioss.
Engine Input
This manual provides a list of all the solution definition keywords and options available in Radioss.
Obsolete
Engine Keyword Keywords that are still supported, but no longer maintained (*) are considered obsolete.

Welcome
What's New
View new features for Radioss 2024.1.
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.
  - Engine Keywords Syntax
  - General Controls
    Engine Keyword In this group keywords are used to generally define the output style, control of computation, damping and ALE setup during the computation.
  - Deletion/Input Modifications
    Engine Keyword In this group, keywords are used for modification (deletion or add options) in Engine.
  - Animation and Post-processing Output Files
    Generates animation files containing results according to the keywords specified. The keywords are specified in the topics within Animation and Post-processing Output Files.
  - Implicit Solution
    Engine Keyword In this group keywords are used for implicit solution. Different implicit solver methods (linear, nonlinear, buckling or quasi-static), different options to control the implicit computation, different implicit time step method and implicit output messages are introduced.
  - Kinematics and Loading
    Engine Keyword In this group, keywords are used to define the kinematic condition (constrain/release rotation or translation DOF) and initial condition (rotational/translational velocity).
  - Time Step
    Engine Keyword In this group, keywords are used to define different time step control (STOP, KILL, CST or DEL, and so on) for different entities (shell, brick, beam, airbag, interface, and so on) during the computation.
  - Initial State
    Engine Keyword In this group, keywords are used to output different info (like stress, strain, orthotropy direction, temperature, and so on) in a state file (STA-File).
  - Obsolete
    Engine Keyword Keywords that are still supported, but no longer maintained (*) are considered obsolete.
    - /ALESUB (Obsolete)
      Engine Keyword Subcycling on Lagrangian parts.
    - /ANIM/CUT/1 (Obsolete)
      Engine Keyword Defines a section cut on a deformed geometry.
    - /ANIM/CUT/2 (Obsolete)
      Engine Keyword Defines a section cut on the initial geometry.
    - /ANIM/CUT/3 (Obsolete)
      Engine Keyword Defines a section cut on a deformed geometry using three nodes.
    - /ANIM/KEEPD (Obsolete)
      Engine Keyword In animation files, keep deleted elements in their original part; otherwise group all deleted elements in an extra part (named "deleted elements").
    - /DT/GLOB/Iflag (Obsolete)
      Engine Keyword Global time step estimation, enables setting the time step to a higher value than the usual elementary or nodal time step.
    - /DT/NODA/Keyword3/Iflag (Obsolete)
      Engine Keyword Activates the nodal time step control method with the option to apply mass scaling to increase a model’s time step.
    - /IMPL/DYNA/FSI (Obsolete)
      Engine Keyword Defines the settings for Fluid Structure Interaction Analysis with AcuSolve.
    - /IMPL/SBCS/MSGLV (Obsolete)
      Engine Keyword Describes the message level for BCS (Boeing) solver.
    - /IMPL/SBCS/ORDER (Obsolete)
      Engine Keyword Reordering method definition for BCS.
    - /IMPL/SBCS/OUTCORE (Obsolete)
      Engine Keyword BCS solver will use minimum in-core memory.
    - /INCMP (Obsolete)
      Engine Keyword Quasi-incompressible formulation for fluid material (compatible with /MAT/LAW6 and /MAT/LAW11).
    - /MADYMO (Obsolete)
      Engine Keyword Activates MADYMO- Radioss coupling.
    - /SHVER/V51 (Obsolete)
      Engine Keyword The new large rotational body motion formulation for QEPH, QBAT and DKT18 will be deactivated.
    - /UPWIND (Obsolete)
      Engine Keyword Enables you to modify coefficients for standard upwind formulation previously defined from Starter Input or from previous run.
    - /UPWM/SUPG (Obsolete)
      Engine Keyword This describes the Streamline Upwind Petrov Galerkin formulation.
    - /UPWM/TG (Obsolete)
      Engine Keyword Describes the Taylor Galerkin method for momentum advection. This method is not available with multi-material LAW51 (/MAT/MULTIMAT).
    - /VEL/ALE (Obsolete)
      Engine Keyword With ALE links on grid velocities, given nodes are linked to the given main grid velocities. You can specify direction or a combination of directions.
- 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.
- 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.

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Obsolete

Engine Keyword Keywords that are still supported, but no longer maintained (*) are considered obsolete.

(*) A keyword can become obsolete for several reasons:

Overtaken by a new and more powerful keyword
No longer used
Dismissed

Note: Obsolete keywords will continue to be supported, but they may no longer be exposed in upcoming versions of the manual. Also, new keyword are recommended, instead of obsolete keyword.

Below is a list of Obsolete Engine keywords:


Obsolete Keywords	As of Version	Replaced with New Keyword
/ALE/0 (or /ALE)	v12.0.210
/ALE/2	v12.0.210	/ALE/SPRING
/ALE/3	v12.0.210	/ALE/ZERO
/ALE/4	v12.0.210	/ALE/STANDARD
/ANIM/KEEPD	v13.0
/SHVER/V51	v13.0
/VEL/ALE	v13.0
/ALE/DISP	v14.0.220	/ALE/GRID/DISP
/ALE/DONEA	v14.0.220	/ALE/GRID/DONEA
/ALE/SPRING	v14.0.220	/ALE/GRID/SPRING
/ALE/STANDARD	v14.0.220	/ALE/GRID/STANDARD
/ALE/ZERO	v14.0.220	/ALE/GRID/ZERO
/ALESUB	v2018
/ANIM/CUT/1	v2018
/ANIM/CUT/2	v2018
/ANIM/CUT/3	v2018
/INCMP	v2018
/UPWIND	v2018	/ALE/MUSCL
/UPWM/SUPG	v2018	/ALE/SUPG/OFF
/UPWM/TG	v2018
/MADYMO/ON	v2021.2
/IMPL/DYNA/FSI	2022.1
/DT/GLOB/Iflag	2022.1
/DT/NODA/CST1	2022.3
/DT/NODA/CST2	2022.3
/IMPL/SBCS/MSGLV	2024.1
/IMPL/SBCS/ORDER	2024.1
/IMPL/SBCS/OUTCORE	2024.1

Alphabetical List