Home
Radioss Example Guide
This manual presents examples solved using Radioss with regard to common problem types.
RD-E: 5500 Fan Blade Rotation Initialization and Impact
Impacts of rotating structures usually happen while the structure is rotating at a steady state. When the structure is rotating at very high speeds, it is necessary to include the centrifugal force field acting on the structure to correctly account for the initial stresses in the structure due to rotation.

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.
Radioss Example Guide
This manual presents examples solved using Radioss with regard to common problem types.
- RD-E: 0100 Twisted Beam
  Bending test on a twisted beam modeled with triangular and quadrilateral meshes and different element formulations (QEPH, QBAT, DKT18).
- RD-E: 0200 Snap-thru Roof
  A snap-through problem is studied on a shallow cylindrical roof upon which an imposed velocity is applied at its mid-point.
- RD-E: 0300 S-Beam Crash
  An S-beam is crushed against a rigid wall with initial velocity.
- RD-E: 0400 Airbag
- RD-E: 0500 Beam Frame
  A beam frame receives an impact from a mass having initial velocity.
- RD-E: 0600 Fuel Tank
  The fluid-structure interaction and the fluid flow are studied in cases of a fuel tank sloshing and overturning. A bi-phase liquid-gas material with an ALE formulation is used to define the interaction between water and air in the fuel tank.
- RD-E: 0700 Pendulums
  The purpose of this example is to study the energy propagation and the momentum transfer through several bodies, initially in contact with each other, subjected to multiple impact. The process of collision and the energetic behavior upon impact are described using a 3-dimensional mode.
- RD-E: 0800 Hopkinson Bar
  The purpose of this example is to model and predict the responses of very high strain rates on a material during impact.
- RD-E: 0900 Billiards (Pool)
  The impact and rebound between balls on a small billiard table is studied. This example deals with the problem of defining interfaces and transmitting momentum between the balls.
- RD-E: 1000 Bending
  Pure bending test with different 3- and 4-nodes shell formulations.
- RD-E: 1100 Tensile Test
  Material characterization using a tensile test.
- RD-E: 1200 Jumping Bicycle
  After a quasi-static pre-loading using gravity, a dummy cyclist rides along a plane, then jumps down onto a lower plane. Sensors are used to simulate the scenario in terms of time.
- RD-E: 1300 Shock Tube Experiment
  A shockwave is generated inside a shock tube filled with air and impacts an aluminum plate.
- RD-E: 1500 Gears
  The purpose of this study is to demonstrate the use of quadratic interface contact using two gears in contact with identical pitch diameter and straight teeth. Two different contact interfaces are compared.
- RD-E: 1600 Dummy Settling
  Quasi-static loading analysis on a dummy, settling on a seat before crash analysis, using Altair Radioss explicit or Radioss implicit solvers.
- RD-E: 1700 Box Beam
  The crashing of a box beam against a rigid wall is a typical and famous example of simulation in dynamic transient problems. The purpose for this example is to study the mesh influence on simulation results when several kinds of shell elements are used.
- RD-E: 1800 Square Plate
  A square plane subjected to in-plane and out-of-plane static loading is a simple element test. It allows you to highlight element formulation for elastic and elasto-plastic cases. The under-integrated quadrilateral shells are compared with the fully-integrated BATOZ shells. The triangles are also studied.
- RD-E: 1900 Wave Propagation
  Elastic wave propagation on a half-space subjected to a vertically-distributed load.
- RD-E: 2000 Ice Cube
  Ice cube dropping on two sliding channels.
- RD-E: 2100 Cam
  The modeling of a camshaft, which takes the engine's rotary motion and translates it into linear motion for operating the intake and exhaust valves, is studied.
- RD-E: 2200 Ditching
  The ditching of an object into a pool of water is studied using ALE and SPH approaches. The simulation results are compared to the experimental data and to the analytical results.
- RD-E: 2300 Brake
  A frictional mechanism is studied, which consists of a brake system, defined by a disc pinched between two pads.
- RD-E: 2400 Laminating
  Two rolling rigid cylinders squeeze a plate to laminate it.
- RD-E: 2500 Spring-back
  An explicit stamping simulation is followed by a spring-back analysis using implicit or explicit solvers for stress relaxation.
- RD-E: 2600 Ruptured Plate
  A metallic thick plate is perforated by a rigid sphere. Simulation of the rupture uses different failure models.
- RD-E: 2700 Football (Soccer) Shots
  Simulation of a soccer ball impact on a goal post.
- RD-E: 3900 Biomedical Valve
  A Fluid-Structure-Interaction (FSI) problem is studied. The Radioss ALE/CFD solver is used to resolve the problem.
- RD-E: 4200 Rubber Ring: Crush and Slide
  A rubber ring resting on a flat rigid surface is pushed down by a circular roller to produce self-contact on the inside surface of the ring. Then the roller is simultaneously rolled and translated so that crushed ring rolls along the flat surface.
- RD-E: 4400 Blow Molding with AMS
  Blow molding with Advanced Mass Scaling (AMS).
- RD-E: 4500 Multi-Domain
  Separate the whole model into main domain and sub-domain and solve each one with its own timestep. The new Multi-Domain Single Input Format makes the sub-domain part definition with the /SUBDOMAIN keyword.
- RD-E: 4600 TNT Cylinder Expansion Test
  An experimental test used to characterize the adiabatic expansion of detonation products. It allows JWL EOS parameters to be determined.
- RD-E: 4700 Concrete Validation
- RD-E: 4800 Spotweld Tests
- RD-E: 4900 Bird Strike on Windshield
  Using SPH elements to simulate a bird hitting a windshield.
- RD-E: 5000 INIVOL and Fluid Structure Interaction (Drop Container)
  The aim of this example is to introduce /INIVOL for initial volume fractions of different materials in multi-material ALE elements, /SURF/PLANE for infinite plane, and fluid structure interaction (FSI) with a Lagrange container.
- RD-E: 5200 Creep and Stress Relaxation
  The purpose of this example is to introduce how to use typical visco-elastic material to simulate creep and stress relaxation tests.
- RD-E: 5300 Thermal Analysis
  A heat source moved on one plate. Heat exchanged between a heatsource and a plate through contact, also between a plate and theatmosphere (water) through convective flux.
- RD-E: 5400 Cut Methodology
  The target of the cut methodology is to study one area of the model by applying the deformation of the full model to a smaller model.
- RD-E: 5500 Fan Blade Rotation Initialization and Impact
  Impacts of rotating structures usually happen while the structure is rotating at a steady state. When the structure is rotating at very high speeds, it is necessary to include the centrifugal force field acting on the structure to correctly account for the initial stresses in the structure due to rotation.
  - RD-E: 5501 Fan Blade Rotation Initialization
    The /LOAD/CENTRI option in Radioss is used to create the centrifugal force field on fan blades.
  - RD-E: 5502 Rotating Fan Blade Ice Impact and Failure
    Two hailstone ice balls are added to the model from RD-E: 5501 Fan Blade Rotation Initialization to study the deformation and failure of the blades when impacted.
- RD-E: 5600 Hyperelastic Material with Curve Input
  The target of this example is to demonstrate how to use material test data for rubber hyperplastic materials.
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.

RD-E: 5500 Fan Blade Rotation Initialization and Impact

Impacts of rotating structures usually happen while the structure is rotating at a steady state. When the structure is rotating at very high speeds, it is necessary to include the centrifugal force field acting on the structure to correctly account for the initial stresses in the structure due to rotation.

RD-E: 5501 Fan Blade Rotation Initialization shows how to use the /LOAD/CENTRI option in Radioss to create the centrifugal force field and then apply an initial and imposed velocity to the rotating fan blades to correctly initialize the steady state rotating condition.

In RD-E: 5502 Rotating Fan Blade Ice Impact and Failure, the rotating fan blades from RD-E: 5501 Fan Blade Rotation Initialization are then impacted by a large hailstone/ice ball modeled using SPH particles. To correctly model the failure of the blades, a Radioss material failure model is applied to them.

RD-E: 5500 Fan Blade Rotation Initialization and Impact

Examples