Using the Workbench LS-DYNA Extension

Using the Workbench LS-DYNA Extension

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Release 18.1

April 2017

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Table of Contents

1. Using the Workbench LS-DYNA Extension ............................................................................................. 1

1.1. Licensing Requirements .................................................................................................................... 1

1.2. Running a Distributed Solution ......................................................................................................... 1

1.3. Setting up a Project .......................................................................................................................... 1

1.3.1. Defining Materials .................................................................................................................... 2

1.3.2. Attaching Geometry ................................................................................................................ 2

1.3.3. Defining Part Behavior ............................................................................................................. 2

1.3.3.1. Airbag or Simple Pressure Volume .................................................................................... 2

1.3.3.2. Adaptive Region .............................................................................................................. 4

1.3.4. Defining Connections .............................................................................................................. 5

1.3.5. Defining Mesh Settings ............................................................................................................ 5

1.3.6. Defining Analysis Settings ........................................................................................................ 6

1.4. Defining Initial Conditions ................................................................................................................ 6

1.5. Defining Boundary Conditions .......................................................................................................... 6

1.5.1. Using the Input File Include Constraint ................................................................................... 7

1.5.2. Using the Keyword Snippet (LS-DYNA) Constraint .................................................................. 7

1.6. Accessing Results .............................................................................................................................. 7

1.7. Additional LS-DYNA Analysis Tools ................................................................................................... 9

Index .......................................................................................................................................................... 11

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Chapter 1: Using the Workbench LS-DYNA Extension

The ANSYS LS-DYNA program is able to run the complete keyword set published in the LS-DYNA?

KEYWORD USER'S MANUAL (R8.1). In the current implementation, a limited subset of the extensive list

of keyword inputs can be generated by Workbench LS-DYNA. The keywords generated through the

standard user interface are supported by ANSYS technical support. The following areas of use are not

supported with Workbench LS-DYNA:

? User-defined material definition

? LS-DYNA user subroutines

? Mesh-free methods: SPH & EFG

? Some special elements such as Seat belt and others

? Fluid Structure Interaction (FSI)

Advanced, knowledgeable users may modify the input file generated and take advantage of the full

keyword set, however ANSYS, Inc. does not provide technical support for modified input files. Note that

post-processing may not work correctly with modified .k files. For those cases use LS-Prepost, available

in the standard installation.

1.1. Licensing Requirements

The Workbench LS-DYNA environment is available to all customers with an ANSYS LS-DYNA license and

requires that license to run problems.

SMP and MPP Parallel processing are both available. They do, however, require the use of ANSYS LSDYNA HPC licenses. The standard ANSYS HPC packs and HPC Workgroup licenses do not work with

ANSYS LS-DYNA. Use ANSYS LS-DYNA HPC licenses for running in parallel.

1.2. Running a Distributed Solution

If you are planning to use the LS-DYNA distributed solution, LS-DYNA is using Intel MPI, which needs

additional configuration and password caching. To cache your Windows password, open a Command

Prompt window and run:

%AWP_ROOT180%\commonfiles\MPI\Intel\5.1.3.180\Windows\setimpipassword.bat

1.3. Setting up a Project

The general outline of setting up an explicit dynamics project can be found in the Explicit Dynamics

Workflow Chapter of the Explicit Dynamics Analysis Guide. LS-DYNA related information is included in

that chapter, but that material was originally written to explain LS-DYNA behavior with regard to the

LS-DYNA Export system. Workbench LS-DYNA has improved the use of LS-DYNA from within Workbench

and those differences are noted in this section.

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of ANSYS, Inc. and its subsidiaries and affiliates.

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