Simulations of non-migrating underwater explosion gas bubbles

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Authors
  1. Marshall, C.
Corporate Authors
Defence Research and Development Canada, Atlantic Research Centre, Halifax NS (CAN)
Abstract
An investigation of the applicability of a computational fluid dynamics methodology developed at Defence Research and Development Canada was performed by conducting a parametric study of the detonation of a wide range of spherical RDX charge masses in water without gravity or a free-surface. The gas bubbles from the simulated detonation of these charges are therefore nonmigrating. The Eulerian blast code “Chinook” was used to simulate the detonations of charge masses of 1.1 g, 20 g, 400 g, 8 kg, and 160 kg in two and three dimensions. Symmetry conditions were employed where possible. Pressure readings at specific monitor points and gas bubble radii were obtained from the results. It was concluded that simple scaling parameters allowed for the numerical methodology to be extended to larger charge masses, with the first gas bubble period and maximum radii agreeing well with experimental data. Subsequent gas bubble periods and maximum radii were larger than those found in experiments. One possible source of error that would explain the discrepancies is an under-prediction of the energy losses observed during bubble collapse, likely due to Chinook using a discretized form of inviscid fluid flow equations and therefore not considering the effects of fluid viscosity. Another possible source of error was excluding the effects of gravity in the simulations.

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Keywords
Underwater Explosion (UNDEX);Computational Fluid Dynamics (CFD)
Report Number
DRDC-RDDC-2018-R271 — Scientific Report
Date of publication
01 Jul 2019
Number of Pages
36
DSTKIM No
CA049771
CANDIS No
810601
Format(s):
Electronic Document(PDF)

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