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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.
Output Database
Block Format Keyword Time histories output for different element groups, section output, or gauge output are described in this group.
Time Histories
Block Format Keyword Describes the time history output request.
/TH/SPHCEL
Block Format Keyword Describes the SPH cell output to time history.

Welcome
What's New
View new features for Radioss 2024.1.
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 2024
  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.
  - 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.
    - Time Histories
      Block Format Keyword Describes the time history output request.
      - /TH/ACCEL
        Block Format Keyword Describes the time history for accelerometers.
      - /TH/BEAM
        Block Format Keyword Describes the time history for beams.
      - /TH/BRIC
        Block Format Keyword Describes the time history for bricks.
      - /TH/CLUSTER
        Block Format Keyword Describes the time history output of spotweld clusters.
      - /TH/CYL_JO
        Block Format Keyword Describes the time history for cylindrical joints.
      - /TH/FRAME
        Block Format Keyword Describes the time history for frames.
      - /TH/FXBODY
        Block Format Keyword Outputs the time history for flexible bodies.
      - /TH/GAUGE
        Block Format Keyword Describes the time history for gauges.
      - /TH/INTER
        Block Format Keyword Describes the time history for interfaces.
      - /TH/MONVOL
        Block Format Keyword Describes the time history for monitored volume.
      - /TH/NODE
        Block Format Keyword Describes the time history for nodes.
      - /TH/NSTRAND
        Block Format Keyword Describes the time history for multi-strand element.
      - /TH/PART
        Block Format Keyword Describes the time history for parts.
      - /TH/QUAD
        Block Format Keyword Describes the time history for a quad.
      - /TH/RBODY
        Block Format Keyword Time history output request for rigid bodies.
      - /TH/RETRACTOR
        Block Format Keyword Describes the time history for retractors.
      - /TH/RWALL
        Block Format Keyword Describes the time history for rigid wall.
      - /TH/SECTIO
        Block Format Keyword Describes the time history for sections.
      - /TH/SENSOR
        Block Format Keyword Describes the time history for sensors.
      - /TH/SH3N
        Block Format Keyword Describes the time history output for 3-noded shell elements. Output parameters are components of stress and strain tensor expressed in different coordinate systems, plastic strains, strain rate, internal energy, element thickness, element deletion flag, and so on.
      - /TH/SHEL
        Block Format Keyword Describes the time history output for 4-node shell elements. Output parameters are components of stress and strain tensor expressed in different coordinate systems, plastic strains, strain rate, internal energy, element thickness, element deletion flag, and so on.
      - /TH/SLIPRING
        Block Format Keyword Describes the time history for sliprings.
      - /TH/SPH_FLOW
        Block Format Keyword Describes the SPH inlet/outlet conditions and control sections.
      - /TH/SPHCEL
        Block Format Keyword Describes the SPH cell output to time history.
      - /TH/SPRING
        Block Format Keyword Describes the time history for springs.
      - /TH/SUBS
        Block Format Keyword Describes the time history for subsets.
      - /TH/SURF
        Block Format Keyword Describes the time history output variables for surfaces.
      - /TH/TRIA
        Block Format Keyword Describes the time history for a tria.
      - /TH/TRUSS
        Block Format Keyword Describes the time history for trusses.
    - Time Histories (Part definitions)
      Block Format Keyword
    - Other Output Databases
      Block Format Keyword
  - 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.

View All Altair HyperWorks Help

/TH/SPHCEL

Block Format Keyword Describes the SPH cell output to time history.

Format


(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
/TH/SPHCEL/`th_group_ID`
`th_group_title`
`var_ID`₁	`var_ID`₂	`var_ID`₃	`var_ID`₄	`var_ID`₅	`var_ID`₆	`var_ID`₇	`var_ID`₈	`var_ID`₉	`var_ID`₁₀

Particle per line, any number of particles may be input


(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
`sphcel_ID`		`sphcel_name`

Definition


Field	Contents	SI Unit Example
`th_group_ID`	Time history group identifier (Integer, maximum 10 digits)
`th_group_title`	Time history group title (Character, maximum 100 characters)
`var_ID`₁, ..`n`	Variables saved for `TH` (see table below) (Character, maximum 8 characters)
`sphcel_ID`	Particle identifier (Integer)
`sphcel_name`	Name of the particle to appear in time history (Character, maximum 100 characters) (Integer)

Comments

Variable names must be left justified.
Available names are listed in the two tables below.
In the first table, TH-variables are listed. If a TH-variable is requested, this variable is written.
In the second table, other variables are listed. If a variable group is requested, all the associated TH-variables are written at once.

If variable name is ALL, all TH-variables are saved for this object.

Variables: OFF, SX, SY, SZ, SXY, SYZ, SXZ, IE, DENS, WFVIS, VOL, PLAS, TEMP, PLSR, VPLA and DIAMETER


Variable	Saved TH-variables
`DEF`	`OFF, SX, SY, SZ, SXY, SYZ, SXZ, IE, DENS, PLAS, TEMP`

Same variables for the option /TH/BRIC are available; except for variable QVIS, which is not available and variables WFVIS (work of artificial viscous forces) and DIAMETER (diameter of the particle) were added.
The following variables are available for all material laws:

Variable

Description

OFF

Element flag

SX, SY, SZ, SXY, SYZ, SXZ

Stresses in global system

IE

Specific internal energy per initial volume

DENS

Density

VOL

Particle initial volume

WFVIS

Work of artificial viscous forces

DIAMETER

Particle diameter (smoothing length)

The following variables are only available for the material laws listed:


Variable	Description	Law Numbers
`TEMP`	Temperature	4, 6, 11, 33, 38
`PLAS`	Equivalent plastic strain	2, 3, 4, 22, 23, 33, 38
`PLSR`	Plastic strain rate	4, 33, 38
`VPLA`	Equivalent volumetric plastic strain	10