recent developments in radioss

Copyright © 2011 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.

Francis Arnaudeau

Altair Development France

5th EHTC

7-9 November, 2011

Bonn

RECENT DEVELOPMENTS IN RADIOSS

Block Format


RADIOSS

AGENDA

SAFETY

CONTACT

SPOTWELD

MATERIAL

CRACK PROPAGATION

ADVANCED MASS SCALING

STAMPING

HYBRID MPP

HYBRID MPP


RADIOSS

ADVANCED SHELL IIHS SIDE MDB (with air effect)


RADIOSS

Q6

ADVANCED CHILD DUMMIES QS

Q1.5

Q1


RADIOSS

ADVANCED PEDESTRIAN LEGFORM IMPACTOR FLEXPLI


RADIOSS

SAFETY MODELS ROADMAP


RADIOSS

AIRBAGS

• /MONVOL/FVMBAG1 /MONVOL/AIRBAG1

• NEW FABRIC FORMULATION WRITING

• FVMBAG : gas mesh on reference state

V11.0.202


RADIOSS

Contact Interfaces

• TYPE 20

• General interface solving node/surface,

surface/surface and edge/edge contact

• Slave node is duplicated after impact into:

• An anchorage node at impact point

• The true slave position

• Benefits :

• Zero-gap

• Initial penetrations allowed

• Solve time-step issues of type7

• TYPE 21

• Rigid Tools can rotate: motion can be defined thru

a skew (non global axis)

• Thermal conduction, same as TYPE7

• Heat transfer dependence on contact pressure

• Friction temperature dependent


RADIOSS

HEXA SPOTWELD

• Zero thickness is allowed

• Specific material /MAT/LAW59

• Failure criteria /FAIL/CONNECT

Benefits :

• Better fit with physical geometrical properties

• Better distribution of forces on welded parts

• Enables higher quality rupture criteria

• High time step

5 6

7 8

1 2

3 4 1

2 3 (normal)


RADIOSS

CRASH-BOX

Spotweld Models Comparison

• Spring Type Beam + Tied Interfaces

• Hexa + Tied Interfaces


RADIOSS

MATERIAL LAWS

• /MAT/LAW42 Available for shells

• /MAT/LAW69 Tabulated input for hyper-elastic material (LAW42)

• /MAT/LAW72 Hill law for solids with MMC failure criterion (MIT)

• /MAT/LAW73 Thermal Hill orthotropic material for shells (LAW43)

• /MAT/LAW74 Thermal tabulated Hill orthotropic law for solids

• /MAT/LAW75 Porous Material Herrmann P-a

• /MAT/LAW78 Yoshida Uemori


RADIOSS

EQUATION OF STATE MODELS

• /EOS/POLYNOMIAL

• /EOS/GRUNEISEN

• /EOS/TILLOTSON

• /EOS/PUFF (11.0.201)

• /EOS/SESAME (11.0.201)

EBAP )()(

10

0

0,05

0,1

0,15

0,2

0,25

0,3

0,35

0,4

0,45

0,5

0,825 0,850 0,875 0,900 0,925 0,950 0,975 1,000

Pre

ssu

re

Tillotson

Radioss


RADIOSS

CRACK MODELIZATION X-FEM

Compatible with Shells (4nodes SHELL and 3nodes

SH3N)

Crack initialization and propagation models (failure

criteria):

• Tuler-Butcher (/FAIL/XFEM_TBUTCH)

• Johnson-Cook (/FAIL/XFEM_JOHNS)

• Forming Limit Diagram (/FAIL/XFEM_FLD)

Crack visualization with HYPERVIEW

Compatible HYBRID MPP

RADIOSS Version 11.0.202


RADIOSS

PLATE WITH HOLE

Imposed Velocity

Imposed Velocity

Initial

Crack 1

Initial

Crack 2

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

/MAT/PLAS_JOHNS/1

Material_A

# Init. dens. Ref. dens.

7.8E-9 0

# E Nu

210000 .3

# a b n Eps_max sigmax

400 550 .5 0 336.60001

# c EPS0 Icc Fsmooth F_CUT

0 0 0 0 0

# m T_melt rhoCp T_i

0 0 0 0

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

/FAIL/XFEM_TBUTCH/1

# LAMBDA K SIGR ISHELL IBRIT

2 .5 336 1 0

# BRIT_B BRIT_C

0 0

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

Crack Propagation :

Tuler Butcher Failure Model


RADIOSS

SIDE CRASH

MODEL SUMMARY

Nb Elements 1 340 000

RADIOSS Version 11.0

Run #1 Run #2 Run #3 Run #4

Nb Cores (HMPP) 32 32 32 96

Nb Cores/Domain (SMP) 1 1 1 4

Nb Domains (SPMD) 32 32 32 24

Radioss Precision Version DP SP SP SP

Time Step Control /DT/NODA/CST /DT/NODA/CST /DT/AMS /DT/AMS

Target Time Step 0.5 s 0.5 s 10 s 10 s

Nb Cycles 202415 202675 10101 10101

Elapsed Time (hours) 6.4 4.4 2.1 0.9

Ratio (Speed Up) 1.4 2.1 2.3


RADIOSS

STAMPING

• NUMISHEET 2008 S-RAIL

• PERFORMANCE


RADIOSS

HYPERFORM

• Multi-stage Forming Process Automation

• Yoshida Uemori Material Law

• Automatic Stamping Initialization for

Crash Models

• Hot Forming


RADIOSS

HYBRID MPP

Value proposition

“Combine the benefit of both RADIOSS parallel versions inside a unique code with enhanced performance and flexibility”

Customer Benefits

Reduce simulation cost thru maximized scalability & performance

Increase flexibility to customer’s needs & hardware resources evolution

High Quality with full repeatability of SMP & SPMD numerical results

Additional cost reduction thru easiest maintenance

Implementation Challenges

Mix MPI programming and OpenMP multithreading

Keep ease of use of SMP with care of MPI installation

Keep ease of debugging of SPMD and its deterministic behavior


RADIOSS

FRONT CRASH

MODEL SUMMARY

Nb Elements 5 800 000

RADIOSS Version 11.0

Time Step Control /DT/NODA/CST

Target Time Step 0.5 ms

Run #1 Run #2 Run #3

Nb Cores (HMPP) 64 64 576

Nb Cores/Domain (SMP) 4 4 6

Nb Domains (SPMD) 16 16 96

Radioss Precision Version DP SP SP

Nb Cycles 201481 201070 201070

Elapsed Time (hours) 35.7 27.6 6.9

Ratio (Speed Up) 1.3 4


RADIOSS

FRONT CRASH

Comparison between 576 cores (SP) and 64 cores(DP)


RADIOSS

FRONT CRASH

Comparison between 576 & 64 cores (Single Precision Version)


RADIOSS

CRASH CASE STUDY

15 Million Element - 100 ms

Platform Intel CRT Data Center in Dupont WA

Intel SR1600UR 144 nodes system

Dual socket x 6 core

Intel Xeon X5570 @ 2.93 GHz

24GB 1333 DDR3 memory

1-GbE, QDR IB Mellanox

RHEL5 update 3

Hybrid

Single Precision

144 SPMD x 12 SMP

1728 cores in total

DT/NODA/CST Mean Time Step 0.2µs

502107 cycles

Performance 11,4 hours


RADIOSS

RADIOSS VERSION 11.x.x SUMMARY

• AMS is a cost effective solution for low speed impact, quasi static

analysis : Roof Crush, Stamping, …

• RADIOSS is a competitive solution for Stamping, AMS results are more

accurate than results using classical Adaptivity

• Scalability, Quality, Repeatability applies to RADIOSS Hybrid MPP

• Very small differences between single and double precision version

• 5 Million elements Crash in few hours

• New Safety tools: Q1, Q1,5, Q6, FLEXPLI

One solver, One result, One partner

ONE product with complete capabilities

recent developments in radioss

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