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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.
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.
Defense
Block Format Keyword
/DFS/DETPOINT/SET
Block Format Keyword Locates the detonation point defined in the node group and set lighting time for an explosive material law.

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View new features for Radioss 2025.
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 2025
  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
  - 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.
    - Initial Conditions
      Block Format Keyword
    - Load
      Block Format Keyword
    - Thermal
      Block Format Keyword
    - Reference State
      Block Format Keyword
    - Defense
      Block Format Keyword
      - /DFS/DETCORD
        Block Format Keyword Set burning times of explosive material elements along a neutral fiber of detonating cord. Neutral fiber is provided with an ordered group of nodes and numerically built by spline interpolation.
      - /DFS/DETLINE
        Block Format Keyword Enable explosive material ignition from a detonation line [A,B].
      - /DFS/DETLINE/NODE
        Block Format Keyword Enable explosive material ignition from a detonation line [A,B].
      - /DFS/DETPLAN
        Block Format Keyword Describes a planar detonation wave.
      - /DFS/DETPLAN/NODE
        Block Format Keyword Describes a planar detonation wave.
      - /DFS/DETPOINT
        Block Format Keyword Locates the detonation point and set lighting time for an explosive material law.
      - /DFS/DETPOINT/NODE
        Block Format Keyword Locates the detonation point and set lighting time for an explosive material law.
      - /DFS/DETPOINT/SET
        Block Format Keyword Locates the detonation point defined in the node group and set lighting time for an explosive material law.
      - /DFS/LASER
        Block Format Keyword Enable to model laser impact taking into account laser-matter interaction. topics/solvers/rad/dfs_laser_starter_r.html#dfs_laser_starter_r__dfs_laser_starter_r_fn_xpw_cfs_b1b
      - /DFS/WAV_SHA
        Block Format Keyword Detonation times are computed taking into account an obstacle. The boundary of the obstacle is provided with an ordered group of nodes which defines the screen lines.
    - ALE Elementary Boundary Conditions
      Block Format Keyword
    - ALE and CFD Constraints
      Block Format Keyword
    - SPH Constraints
      Block Format Keyword
  - 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.
- 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.
- Multi-Domain
  This manual contains the description of the keywords for the Radioss Multi-Domain.
- Obsolete Keywords
  Keywords that are still supported, but no longer maintained (*) are considered obsolete.
- 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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/DFS/DETPOINT/SET

Block Format Keyword Locates the detonation point defined in the node group and set lighting time for an explosive material law.

Format


(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
/DFS/DETPOINT/SET/`detpoint_ID`/`unit_ID`
						`T`_DET		`mat_ID`	`grnd_ID`

Definition


Field	Contents	SI Unit Example
`detpoint_ID`	Point detonator identifier. (Integer, maximum 10 digits)
`unit_ID`	Unit identifier. (Integer, maximum 10 digits)
`T`_DET	Detonation time. Default = 0.0 (Real)	$[s]$
`mat_ID`	Explosive material number concerned by detonation time. = 0 (Default) All /MAT/LAW5 (JWL) material law are affected by the detonation time. (Integer)
`grnd_ID`	(Mandatory) Node group identifier defining ignition coordinates. (Integer)

Comments

It is possible to define multiple detonation points.
If a detonation point is not defined, JWL material law will instantaneously detonate.
Detonation times are available in the Starter output file (IPRI > 3).
Burn fractions are available in time history file with /TH/BRIC card and BFRAC keyword.