Open AccessResponse of a water-filled spherical vessel to an internal explosion
Author(s) -
M W Lewis,
T L Wilson
Publication year - 1997
Language(s) - English
Resource type - Reports
DOI - 10.2172/515568
Subject(s) - explosive material , mechanics , bubble , fluid–structure interaction , detonation , nonlinear system , underwater explosion , underwater , finite element method , cavitation , equation of state , internal energy , materials science , physics , structural engineering , classical mechanics , engineering , geology , thermodynamics , chemistry , oceanography , organic chemistry , quantum mechanics
Many problems of interest to the defense community involve fluid-structure interaction (FSI). Such problems include underwater blast loading of structures, bubble dynamics and jetting around structures, and hydrodynamic ram events. These problems may involve gas, fluid, and solid dynamics, nonlinear material behavior, cavitation, reaction kinetics, material failure, and nonlinearity that is due to varying geometry and contact conditions within a structure or between structures. Here, the authors model the response of a water-filled, thick-walled, spherical steel vessel to an internal explosion of 30 grams of C-4 with FSI2D--a two-dimensional coupled finite element and finite volume hydrodynamics code. The gas phase detonation products were modeled with a Becker-Kistiakowsky-Wilson high-explosive equation of state. Predictions from a fully coupled model were compared to experimental results in the form of strain gauge traces. Agreement was reasonably good. Additionally, the calculation was run in an uncoupled mode to understand the importance of fluid-structure interaction in this problem. The uncoupled model results in an accumulation of nonphysical energy in the vessel