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- Title
The requirement for hydrostatic initialisation in LS-DYNA/USA finite element models.
- Authors
Lloyd Hammond; Raphael Grzebieta
- Abstract
The LS-DYNA/USA (Underwater Shock Analysis) coupled finite element codes are being investigated as a tool for predicting the local response of compliant plate structures subjected to far-field underwater explosion. It had previously been observed in LS-DYNA/USA models that extraneous pressure build-ups emanating from the DAA (doubly asymptotic approximation) boundaries may occur in the surrounding fluid region of the model, which inevitably lead to erroneous modelling of fluid-structure interaction and inaccurate structural responses. These instabilities typically result in divergence of the solution and eventually premature termination of the simulation. After a comprehensive investigation, it was found that the instabilities did not arise if the finite element model was hydrostatically initialised before conducting the LS-DYNA/USA simulation. The purpose of this study is to investigate the need for achieving hydrostatic equilibrium prior to the modelling of the shock wave propagation through the fluid-structure media. The method for achieving static equilibrium with the current version of the LS-DYNA/USA software is presented. The example simulations presented show that the hydrostatic initialisation procedure is effective in removing instabilities occurring at the DAA-fluid boundary, associated with the USA ambient hydrostatic pressure condition.
- Subjects
FINITE element method; SHOCK waves; UNDERWATER explosions; HYDROSTATICS
- Publication
Shock & Vibration, 2000, Vol 7, Issue 2, p57
- ISSN
1070-9622
- Publication type
Article
- DOI
10.1155/2000/972928