ansys 15.0 ansys explicit update

© 2013 ANSYS, Inc. December 18, 2013 1

ANSYS Explicit Dynamics R15.0 New Features and Enhancements

Norman Robertson Lead Product Manager

[email protected]

mailto:[email protected]


• High Performance Computing (HPC) *

– Parallel Trajectory Contact (TC)

• Enhanced Connections *

– Spring/Damper Exposure

• Implicit-Explicit Enhancement *

– Pressure Initialization

• Other Enhancements *

– Meshing Enhancements

– New “Go To” Options

– Enhanced Crushable Foam Support

– Double Precision

• ANSYS LS-DYNA

– ANSYS Workbench LS-DYNA

ANSYS Explicit Dynamics R15.0 - Summary of New Features and Enhancements

Capabilities described cover both ANSYS Explicit STR and ANSYS Autodyn (where applicable)

*


• General release of Parallel Trajectory Contact (TC)

– Concludes a major development over a few releases, to deliver Trajectory Contact (TC) in parallel simulations

• TC with/without erosion

• TC available with all Lagrange/FE solvers, except SPH or (old) “Structured FE” solvers [SPH support planned for future]

– Parallel now available for Explicit Dynamics Analysis System (working with ANSYS HPC solutions)

– Extends existing parallel (HPC) capabilities already available with the Autodyn Component System (via Gap/Proximity Contact)

• Further Parallel Support Summary

– Euler-Lagrange Coupling (FSI) now in Explicit Dynamics Analysis System

– Bonds (breakable & non-breakable)

– Boundary Conditions (all EXCEPT Analytical Blast)

– Spotwelds (breakable & non-breakable) [breakable not in Preview 3]

– Remote points and Remote displacements

– Shell thickness (specifically shell thickness > zero)

High Performance Computing (HPC)


HPC Performance - Performance Examples (1)

• Many performance tests have been conducted

– 4 examples shown here highlighting the range of latest parallel capabilities

– Note speedup is dependent on a number of model factors including model size, solvers & coupling, result edits, PC and/or CPU configuration

• Example 1: Test Vessel Drop

– 812,468 Elements (ANP tetrahedra,

Hexahedra & Shells)

– Bonds & TC (no Erosion)

Number of Cores/CPUs 1 2 4 8 Solver Time (minutes) 42.37 21.06 12.21 6.62

Speedup 1 2.01 3.47 6.4

Efficiency (%) 100.6% 86.8% 80.0%

0

2

4

6

8

1 2 4 8

Vessel Drop Speedup


• Example 2: Pull Test Failure

– NBS Tetrahedral elements

– Limited Erosion & TC

• Example 3: Long Rod Penetration

– 680,000 Elements (mostly Hexahedra, some ANP Tetrahedra)

– Significant Erosion & TC

HPC Performance - Performance Examples (2-3)

Number of Cores/CPUs 1 2 4 8

Run Time (minutes) 291.30 174.68 91.36 52.77

Speedup 1 1.67 3.19 5.52

Efficiency (%) 83.5% 79.7% 69.0% 0

1

2

3

4

5

6

1 2 4 8

Pull Test Speedup

0

1

2

3

4

5

1 2 4 8

Long Rod Speedup


Solver Time (minutes) 490.30 211.70 175.60 110.00

Speedup 1 2.32 2.79 4.46

Efficiency (%) 115.8% 69.8% 55.7%


• Example 4: Explosive Fragmentation

– 788,000 ANP Tetrahedra & 344,000 Multi-Material Euler

– Euler-Lagrange Coupled (FSI), Erosion & Bonded Contact

• In summary – Excellent speedup efficiencies observed across wide range of relatively small to large

problems (typically speedups of at least 4 over 8 slaves i.e. over 50% efficiency)

HPC Performance - Performance Examples (4)


Solver Time (minutes) 321.60 179.80 105.00 83.10

Speedup 1 1.79 3.06 3.87

Efficiency (%) 89.5% 76.5% 48.4%

0

1

2

3

4

5

1 2 4 8

Explosive Fragmentation Speedup


• Spring connections definition available in Explicit Dynamics system

• Both Longitudinal Stiffness and Damping are supported

– Example shows displacement of undamped (top) and damped (bottom) springs

• Linear and Nonlinear behaviour

– Nonlinear spring definition via Tabular Input (unlimited data points)

• Preloads not supported

• Results trackers

• Limitations

– Torsional springs not supported

– Body-Ground springs not supported

Enhanced Connections - Spring/Damper Exposure


• You can use a spring tracker to display the following longitudinal result items from a spring in an Explicit Dynamics analysis

– Elongation – Elongation is the relative displacement between the two ends of the springs. The elongation could be positive (stretching the spring) or negative (compressing the spring).

– Velocity – Velocity is the rate of stretch (or compression) of the spring.

– Elastic Force – Elastic force is calculated as (Spring Stiffness * Elongation). The force acts along the length of the spring (see example graph below)

– Damping Force – Damping force is calculated as (Damping Factor * velocity) and acts to resist motion.

Spring/Damper Exposure - Trackers

Spring Elastic Force


Implicit-Explicit Enhancement - Pressure Initialization

• Pressure Initialization for cases where only final deformed geometry known from the implicit analysis

– As the mesh is seen as “undeformed”, there is no compression and therefore no pressure

– ANSYS results database created using INISTATE file

– Explicit simulation then intialized from the ANSYS results database

– Typical example may be in material processing where initial implicit analysis may be run separately and before further implicit and/or explicit analyses


• Assembly Meshing

– Combine separate previously meshed parts

Other Enhancements - Meshing Enhancements


• Parallel Meshing

– For problems with multiple parts, parts can be assigned to a separate core to be meshed in parallel reducing the elapsed time required for meshing

– No HPC licenses are required

Meshing Enhancements


• New “Go To” options available for Explicit Dynamics analyses

– Identifies body interaction objects in the tree that are associated with selected bodies (see right)

• Enhanced Crushable Foam Support

– The full stress/strain curve from Engineering Data now passed to solver for crushable foam

• Double Precision

– All analyses are now in Double Precision (Single Precision no longer available)

– Double Precision will generally be more accurate whilst and only causing limited increase in CPU time and memory consumption (typically 10-30%)

Other Enhancements


• ANSYS Workbench LS-DYNA

– New User Interface for running ANSYS LS-DYNA

– Joint project between ANSYS and LSTC

– Provides interactive pre-processing, solve and post-processing control

– Developed using ACT in the current Workbench environment for Mechanical/Explicit Dynamics users

• Initial Release March 2013

– Initially available with R14.5 (during R15.0 development phase)

– Available at no additional fee for users ANSYS LS-DYNA, ANSYS LS-DYNA PC or ANSYS LS-DYNA PrepPost (who are current on TECS)

– Is currently in addition to the Explicit Dynamics (LS-DYNA Export) System

ANSYS LS-DYNA


• Go to ANSYS Customer Portal

– Select “Downloads” and “Extension Library”

– Select “ACT Library”

– Select “Workbench LS-DYNA xxx” (xxx is Version No.)

– Download the extension (zip file)

• You will be asked to accept “cleick-wrap license terms

• The zip file contains installation instruction and user instructions in addition to the setup and extension files

– Follow the instructions to install and use the software…

Workbench LS-DYNA - Where to get it!


Workbench LS-DYNA - Overview


Access to bidirectional CAD- Interfaces

Preparation of simulation suitable geometry

Design Modeler

Space Claim Direct Modeler

Workbench LS-DYNA - Geometry


Workbench user can define materials as usual in the material-section

Choose material properties you want to include

Only materials which can be translated are accessible

The interface creates material cards depending on the chosen material model and material properties

Workbench LS-DYNA - Materials


Workbench LS-DYNA - Materials Keywords


Workbench user can set up model as done in other analysis

Interface creates corresponding cards

In general default settings are used, based on many years of experiences Additional options can be chosen

LS-DYNA user can create specific cards by

choosing several options

material

contact

mesh

boundaries

Workbench LS-DYNA - General Model Setup


At least simulation time has to be chosen by user

Make global settings here

local settings by the additional buttons

For example:

Set Mass scaling

Chose number of CPU’s

Set global Hourglass control

Output frequency of d3plot

Output frequency of ASCII data

...

mass scaling

number of CPU

global hourglass control

output format and frequency (d3plot)

output frequency (ASCII)

Workbench LS-DYNA - Analysis Settings


Workbench LS-DYNA - Post-Processing

General post-processing of contour data

Graphic erosion not supported at R14.5 (available at R15.0)

Plot of ASCII data

Time Histories

Custom Results

Available via Worksheet

Total and EPS only available through Worksheet

Animation of results

ansys 15.0 ansys explicit update

Documents

ansys autodyn

ansys hpc solutions

ansys explicit str

test speedup

high performance computing

performance tests

erosion number of corescpus

erosion bonded contact