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2023
What's New
View new features for Radioss 2023 .
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 2023
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)
The Smooth Particle Hydrodynamics method formulation is used to solve the equations of mechanics, when particles are
free from a meshing grid.
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 list the compatibility options for each of the material laws.
Elasto-plastic Materials
These materials can be used to represent elasto-plastic materials.
Hyper and Visco-elastic Materials
These materials can be used to represent hyper and visco-elastic materials.
Composite and Fabric Materials
These materials can be used to represent composite and fabric materials.
Multiscale Materials
Concrete and Rock Materials
In Radioss these materials can be used to represent rock or concrete materials.
Honeycomb Materials
These materials can be used to represent honeycomb materials.
Connection Materials
These materials can be used to represent connection materials.
Other Materials
These materials can be used to represent other materials.
Multi-Material, Fluid and Explosive Materials
These materials can be used to represent 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 multi-fluid compressible flows by defining a sub-material 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).
CFD Materials
ALE and CFD Options
Block Format Keyword ALE and CFD options used to activate ALE formulation or Eulerian formulation for a given material law.
Viscosity Option
Leakage Option
Thermal Option
Equation of State
Used by Radioss to compute the hydrodynamic pressure.
Failure Models
The supported failure models in Radioss .
Properties
Block Format Keyword
Monitored Volumes (Airbags)
Block Format Keyword Monitored volumes can be used to model an airbag, tire, tank, or any closed volume.
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
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.
ALE Materials
All characters beyond
the tenth of a keyword are ignored (for example, it is possible to input
HONEYCOM , instead of HONEYCOMB ).
The Manual Keyword is
the keyword of the law as referenced in this manual.
The Law Number is the
material law number used to reference the material law in the fixed format
manual.
The Other Available
Keywords column features other keywords which can be used to define the same
material laws.
In addition to the ALE
material laws, the material laws 1, 2, 3, 4 and the isotropic material laws with
volumetric properties are compatible with the ALE approach. ALE (Arbitrary
Lagrangian-Eulerian) material laws (11, 18, 20, 26, 37 and 51) are described in
the ALE options.
If a node is connected
to an ALE material, the nodal value output to /TH and
Animation files have the following description:
/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 - ˙ ε /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).