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Radioss 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.
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.
/GRNOD
Block Format Keyword Node Groups
/GRNOD/NODENS
Block Format Keyword Describes the unsortable node groups by list of nodes.

Welcome
What's New
View new features for Radioss 2026.
Radioss Overview
Radioss is a leading explicit finite element solver for crash and impact simulation.
Tutorials
Discover Radioss functionality with interactive tutorials.
Radioss User Guide
This manual provides details on the features, functionality, and simulation methods available in Altair Radioss.
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 2026
  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
      - /GRNOD/BOX
        Block Format Keyword Describes a node group inside the referenced box.
      - /GRNOD/GEN_INCR
        Block Format Keyword Generates a group of nodes by listing the first and last node IDs in the range with a user-defined increment value.
      - /GRNOD/GENE
        Block Format Keyword Generates a group of nodes by listing the first and last node IDs in the range.
      - /GRNOD/GRBEAM
        Block Format Keyword Describes the node groups which are selected from beam groups.
      - /GRNOD/GRBRIC
        Block Format Keyword Describes the node groups which are selected from brick groups.
      - /GRNOD/GRNOD
        Block Format Keyword Describes the node groups which are selected from other node groups.
      - /GRNOD/GRQUAD
        Block Format Keyword Describes the node groups which are selected from quad groups.
      - /GRNOD/GRSHEL
        Block Format Keyword Describes the node groups which are selected from 4-node shell groups.
      - /GRNOD/GRSH3N
        Block Format Keyword Describes the node groups which are selected from 3-node shell groups.
      - /GRNOD/GRSPRI
        Block Format Keyword Describes the node groups which are selected from spring groups.
      - /GRNOD/GRTRUS
        Block Format Keyword Describes the node groups which are selected from truss groups.
      - /GRNOD/LINE
        Block Format Keyword Describes the node groups which are selected from lines.
      - /GRNOD/MAT
        Block Format Keyword Describes the node groups which are selected from materials.
      - /GRNOD/NODE
        Block Format Keyword Describes the node groups by list of nodes.
      - /GRNOD/NODENS
        Block Format Keyword Describes the unsortable node groups by list of nodes.
      - /GRNOD/PART
        Block Format Keyword Describes the node groups which are selected from parts.
      - /GRNOD/PROP
        Block Format Keyword Describes the node groups which are selected from properties.
      - /GRNOD/SUBMODEL
        Block Format Keyword Describes the node groups which are selected from submodels.
      - /GRNOD/SUBSET
        Block Format Keyword Describes the node groups which are selected from subsets.
      - /GRNOD/SURF
        Block Format Keyword Describes the node groups which are selected from surfaces.
    - /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
    - 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
Radioss Example Guide
This manual presents examples solved using Radioss with regard to common problem types.
Radioss Verification Problems
This manual presents solved verification models.
Radioss Frequently Asked Questions
This section provides quick responses to typical and frequently asked questions regarding Radioss.
Radioss Theory Manual
This manual provides detailed information about the theory used in the Altair Radioss Solver.
Radioss User Subroutines
This manual describes the interface between Altair Radioss and user subroutines.

View All Altair HyperWorks Help

/GRNOD/NODENS

Block Format Keyword Describes the unsortable node groups by list of nodes.

Format

Enter node numbers in the desired order (any number may be input, 10 per Line)


(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
/GRNOD/NODENS/`grnd_ID`/`unit_ID`
`grnd_title`
`item_ID`₁	`item_ID`₂	`item_ID`₃	`item_ID`₄	`item_ID`₅	`item_ID`₆	`item_ID`₇	`item_ID`₈	`item_ID`₉	`item_ID`₁₀

Definition


Field	Contents	SI Unit Example
`grnd_ID`	Node group identifier. (Integer, maximum 10 digits)
`unit_ID`	Unit identifier. (Integer, maximum 10 digits)
`grnd_title`	Node group title. (Character, maximum 100 characters)
`item_ID`₁, `item_ID`₂..., `item_ID`₁₀	List of node identifiers. (Integer)

Comments

Node groups are used to define secondary nodes of rigid walls, interfaces, rigid bodies or nodes to which a load is applied, like a concentrated load or a fixed velocity.
Nodes are not sorted by Radioss, they retain the order entered. This option is only needed in interface TYPE8 and /XELEM.