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Radioss
Radioss

2025
Index
  1. Home
  2. Reference Guide

    This manual provides a detailed list of all the input keywords and options available in Radioss.

  3. Starter Input

    This manual provides a list of all the model definition keywords and options available in Radioss.

  4. 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.

  5. Boxes

    Block Format Keyword

  • Welcome
  • What's New

    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.

      • 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.

        • /GRBEAM

          Block Format Keyword Beam Groups

        • /GRBRIC

          Block Format Keyword Brick Groups

        • /GRNOD

          Block Format Keyword Node Groups

        • /GRPART

          Block Format Keyword Describes the part groups.

        • /GRQUAD

          Block Format Keyword Describes the quad groups.

        • /GRSH3N

          Block Format Keyword Describes the 3 node shell groups.

        • /GRSHEL

          Block Format Keyword Describes the shell groups.

        • /GRSPRI

          Block Format Keyword Describes the spring groups.

        • /GRTRIA

          Block Format Keyword Describes a group of 3 node solid elements.

        • /GRTRUS

          Block Format Keyword Describes the truss groups.

        • /SET

          Block Format Keyword Defines a general entity set which can be referenced by other entities.

        • Boxes

          Block Format Keyword

          • /BOX/BOX

            Block Format Keyword Describes the box as a result of the combination of a predefined list of boxes.

          • /BOX/CYLIN

            Block Format Keyword Describes a cylinder box for entities selection.

          • /BOX/RECTA

            Block Format Keyword Describes a rectangle box for entities selection.

          • /BOX/SPHER

            Block Format Keyword Describes a spherical box for entities selection.

        • Lines

          Block Format Keyword

        • Surfaces

          Block Format Keyword

      • 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.

View All Altair HyperWorks Help

Boxes

Block Format Keyword

Input Type Keywords: Box

Keyword
Input Type
/BOX/BOX
Complex box definition
/BOX/RECTA
Box type - Rectangle
/BOX/CYLIN
Box type - Cylinder
/BOX/SPHER
Box type - Sphere

Comments

  1. A box is used for:
    • a simple group definition (/GRBEAM, /GRBRIC, /GRNOD, /GRQUAD, /GRSH3N, /GRSHEL, /GRSPRI, /GRTRUS, Lines, Surfaces) - all entities within the box are included
    • a complex box definition (see /BOX/BOX)
  • /BOX/BOX
    Block Format Keyword Describes the box as a result of the combination of a predefined list of boxes.
  • /BOX/CYLIN
    Block Format Keyword Describes a cylinder box for entities selection.
  • /BOX/RECTA
    Block Format Keyword Describes a rectangle box for entities selection.
  • /BOX/SPHER
    Block Format Keyword Describes a spherical box for entities selection.
On this page
  • Input Type Keywords: Box
  • Comments

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