Radioss

2021

Home
Reference Guide
This manual provides a detailed list of all the input keywords and options available in Radioss.
Starter Input
This manual provides a list of all the model definition keywords and options available in Radioss.
Materials
Multi-Material, Fluid and Explosive Materials
ALE Materials
/MAT/LAW51 (MULTIMAT)
Block Format Keyword Up to four material laws can be defined: elasto-plastic solid, liquid, gas and detonation products. The material law is based on a diffusive interface technique to get sharper interfaces between submaterial zone (/ALE/MUSCL in Radioss Starter Input).
Boundary Group

What's New
Overview
Tutorials
User Guide
Reference Guide
Example Guide
Verification Problems
Frequently Asked Questions
Theory Manual
User Subroutines
Starter Input
Engine Input

Index

2021

Radioss

What's New
View new features for Radioss 2021.
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
  Radioss format 2021 uses the 12x extension format.
- Single File Input
  This format allows running either Starter or Engine with the same file.
- New Keywords in 2021
  New and modified features in Radioss.
- Starter Input
  This manual provides a list of all the model definition keywords and options available in Radioss.
  - 2D and 3D Analysis Options
  - Starter Keywords Syntax
    Block Format Keyword
  - Smooth Particle Hydrodynamics (SPH)
  - Computational Fluid Dynamics (CFD)
  - General Controls
    Block Format Keyword In this group, keywords are used to set default value, global parameter, analysis type, input/output print, damping and ALE and CFD treatment for the whole model. For default value, it is still possible to overwrite in each specific keywords.
  - Nodes
    Block Format Keyword In Radioss, two node types are available. They use Cartesian coordinate to describe the position of each node.
  - Elements
    Block Format Keyword
  - Component and Parts Organization
    Block Format Keyword In this group, keywords are used to combine material and property information (/PART), assemble model (/SUBSET) or define a separate model (//SUBMODEL).
  - Interfaces
    Block Format Keyword Interfaces solve the contact and impact conditions between two parts of a model. Several interface types are available in Radioss and use different contact treatments.
  - Materials
    - Material Compatibility
      Block Format Keyword The following tables lists the compatibility options for each of the material laws.
    - Elasto-plastic Materials
    - Hyper and Visco-elastic Materials
    - Composite and Fabric Materials
    - Concrete and Rock Materials
    - Honeycomb Materials
    - Connection Materials
    - Other Materials
    - Multi-Material, Fluid and Explosive Materials
      - /MAT/LAW5 (JWL)
        Block Format Keyword This law describes the Jones-Wilkins-Lee EOS for detonation products of high explosives. Optional afterburning modeling is available.
      - /MAT/LAW6 (HYDRO or HYD_VISC)
        Block Format Keyword Describes a fluid material. Pressure is computed using Equation of State provided by definition of /EOS option.
      - /MAT/LAW41 (LEE_TARVER)
        Block Format Keyword This material law describes detonation products using an ignition and growth model of a reactive material.
      - /MAT/LAW97 (JWLB)
        Block Format Keyword This law describes the Jones-Wilkins-Lee-Baker EOS for detonation products of high explosives.
      - /MAT/LAW151 (MULTIFLUID)
        Block Format Keyword Simulation of multifluid compressible flows by defining a submaterial and initial volume fraction.
      - ALE Materials
        
        /MAT/LAW11 (BOUND)
        Block Format Keyword This law describes the boundary conditions material in flow analysis (ALE or EULER). It is compatible for 2D and 3D analysis. It is not compatible with Multi-Material ALE laws, LAW37 (BIMAT) and /MAT/LAW51 (MULTIMAT). In case of turbulence, activate boundary turbulence modeling using /MAT/B-K-EPS and input κ - boundary conditions.
        
        /MAT/LAW18 (THERM)
        Block Format Keyword This law describes thermal material.
        
        /MAT/LAW20 (BIMAT)
        Block Format Keyword ALE multi-material law for 2D analysis.
        
        /MAT/LAW26 (SESAM)
        Block Format Keyword This ALE material law describes a SESAME tabular EOS, used with a Johnson-Cook yield criterion.
        
        /MAT/LAW37 (BIPHAS)
        Block Format Keyword Describes the hydrodynamic bi-material liquid gas material. It is not recommended to use multi-material laws with Radioss single precision engine.
        
        /MAT/LAW51 (MULTIMAT)
        Block Format Keyword Up to four material laws can be defined: elasto-plastic solid, liquid, gas and detonation products. The material law is based on a diffusive interface technique to get sharper interfaces between submaterial zone (/ALE/MUSCL in Radioss Starter Input).
        
        Boundary Group
        
        Iform = 2
        Block Format Keyword This boundary material enables to impose sub-material states (density, energy, and volumetric fraction) which are also used to compute global material state. Submaterial EOS parameters must be consistent with the ones in adjacent element (from the domain).
        
        Iform = 4
        Block Format Keyword This boundary can simulate gas inlet conditions for multi-material ALE laws (formulation: I_form = 0, 1, 10, or 11).
        
        Iform = 5
        Block Format Keyword This boundary can simulate liquid inlet conditions for multi-material ALE laws (formulation: I_form = 0, 1, 10, or 11).
        
        Iform = 6
        Block Format Keyword This boundary material enables you to simulate a non-reflecting outlet boundary for multi-material law /MAT/LAW51 (I_form = 0, 1, 10, or 11). This material is useful to model an infinite domain. Elements assigned this material law act like a non-reflecting elementary boundary.
        
        Multi-Material Group
      - CFD Materials
    - ALE and CFD Options
      Block Format Keyword ALE and CFD options used to active ALE formulation or Eulerian formulation for a given material law.
    - Viscosity Option
    - Leakage Option
    - Thermal Option
    - Equation of State
    - Failure Models
  - Properties
    Block Format Keyword
  - Monitored Volumes (Airbags)
    Block Format Keyword Monitored volumes could be used for airbag or tire. The monitored volumes must be inside of closed surface.
  - Constraints
    Block Format Keyword Radioss supports several different kinematic constraints, which are mainly used to impose acceleration, velocity, displacement or temperature in structure or constraint the moving of structure. They are mutually exclusive for each degree-of-freedom (DOF). Two kinematic conditions applied to the same node may be incompatible.
  - Load Cases
    Block Format Keyword In Radioss the following load cases are available. Stress/strain as initial state could be considered by modeling, as well as pressure, gravity, and thermal load.
  - Tools
    Block Format Keyword In this group, tools like transformation, frames, skews, and curve are introduced.
  - Groups(Sets)
    Block Format Keyword Keywords in this group are used to define how to select a group of node, part, elements, lines, or surfaces.
  - Adaptive Meshings
    Block Format Keyword Adaptive Meshing is used in metal forming to divide the element to better describe the geometry. /ADMESH/GLOBAL and /ADMESH/SET are not available for SPMD computation.
  - Output Database
    Block Format Keyword Time histories output for different element groups, section output, or gauge output are described in this group.
  - Obsolete
    Block Format Keyword Keywords that are still supported, but no longer maintained (*) are considered obsolete.
- Engine Input
  This manual provides a list of all the solution definition keywords and options available in Radioss.
- LS-DYNA Input (Beta)
  This manual contains an alphabetical 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
- Definitions
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 a user’s subroutines.
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.

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Radioss

2021

Home
Reference Guide
This manual provides a detailed list of all the input keywords and options available in Radioss.
Starter Input
This manual provides a list of all the model definition keywords and options available in Radioss.
Materials
Multi-Material, Fluid and Explosive Materials
ALE Materials
/MAT/LAW51 (MULTIMAT)
Block Format Keyword Up to four material laws can be defined: elasto-plastic solid, liquid, gas and detonation products. The material law is based on a diffusive interface technique to get sharper interfaces between submaterial zone (/ALE/MUSCL in Radioss Starter Input).
Boundary Group

What's New
Overview
Tutorials
User Guide
Reference Guide
Example Guide
Verification Problems
Frequently Asked Questions
Theory Manual
User Subroutines
Starter Input
Engine Input

Index

Boundary Group

Iform = 2
Block Format Keyword This boundary material enables to impose sub-material states (density, energy, and volumetric fraction) which are also used to compute global material state. Submaterial EOS parameters must be consistent with the ones in adjacent element (from the domain).
Iform = 4
Block Format Keyword This boundary can simulate gas inlet conditions for multi-material ALE laws (formulation: I_form = 0, 1, 10, or 11).
Iform = 5
Block Format Keyword This boundary can simulate liquid inlet conditions for multi-material ALE laws (formulation: I_form = 0, 1, 10, or 11).
Iform = 6
Block Format Keyword This boundary material enables you to simulate a non-reflecting outlet boundary for multi-material law /MAT/LAW51 (I_form = 0, 1, 10, or 11). This material is useful to model an infinite domain. Elements assigned this material law act like a non-reflecting elementary boundary.

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