Oasys LS-DYNA Environment 8.1 VOLUME 3 ... - Oasys Software

Oasys LS-DYNA Environment: User Guide (Version 8.1)
To obtain time-history information, set IDRFLG to -1. Time history results will then be written
to the THF and XTF files. See note in Keyword manual under
*CONTROL_DYNAMIC_RELAXATION.
CONVERGENCE BEHAVIOUR
Typical convergence behaviour for a successful dynamic relaxation run is shown below. Under
damped and over damped responses are shown for comparison
Figure 13.2 Convergence Behaviour
The most common problem with dynamic relaxation is that the solution fails to converge. Such
cases can be divided into two types:
a) the solution never starts to converge
b) the solution partly converges but never reaches the convergence tolerance.
Figure 13.3 Convergence
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