User`s guide

MADYMO Coupling Manual Release 7.5
5 Coupling with LS-DYNA
5.1 Introduction
This section gives specific information related to the coupling with LS-DYNA. All information
is applicable to both the SMP as well as the MPP version of LS-DYNA (MPP-DYNA), unless
specifically indicated otherwise.
Please note that the details of the input deck for LS-DYNA have been based on LS-DYNA 970
and may be subject to modifications. Always refer to the latest LS-DYNA documentation for
the correct syntax.
5.2 Simulation Control
• For general simulation control, please refer to Sec.
1.1.3.
• Defining the number of CPUs/Nodes to run on:
– For an SMP job, LS-DYNA uses the number of CPUs defined with the NCPU option.
The *CONTROL_PARALLEL keyword in the input file is obsolete.
– For an MPP job, MPP-DYNA, the number of nodes is defined through the MPI
command line option (see Sec. 8.1.3).
5.3 LS-DYNA Input Deck Setup
This section describes the required modifications to the LS-DYNA input deck to perform Ba-
sic Coupling or Extended Coupling simulations. See the LS-DYNA User Manual for details
on the cards not mentioned here specifically. Modifications to the MADYMO input deck are
described in Sec.
3.
For all couplings, add the *CONTROL_COUPLING card to set the units relationship between
MADYMO and LS-DYNA:
*
CONTROL_COUPLING
$# UNLENG UNTIME UNFORC TIMIDL FLIPX FLIPY FLIPZ SUBCYL
1000. 1. 1. 0. 0 0 0 0
Here the 1000 specifies that LS-DYNA should divide their length values by 1000 before send-
ing them to MADYMO. Length values received from MADYMO will be multiplied by 1000.
This control coupling card example shows that the LS-DYNA length units are: mm. The time
and force numbers are unchanged with respect to MADYMO (so second’s and Newton’s).
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