Abstract
The pressure on a flat plate suspended over a submerged detonation is measured and simulated. Calculation and experiment are in relatively good agreement, although there is variation in experimental results and simulations are sensitive, near the centerline, to the computational details. This sensitivity is linked to the instability of the accelerating plume, typical of a Richtmyer-Meshkov instability. The plate loading features an initial force at plate center, followed by an expanding circular loading pattern. The initial load is due to plume impact, while the circular load arises from the impact of water transported up the edges of the explosion cavity.
Highlights
This paper describes pressures on a plate suspended above a detonation submerged in water
Twin pressure peaks occur for Grids 3 and 4 but are resolved as a single peak on Grids 1 and 2
Additional calculations have been performed covering a range of plate stand-offs and charge depths
Summary
This paper describes pressures on a plate suspended above a detonation submerged in water. It examines mechanisms operative over a range of plate stand-offs and charge depths. Compared to the buried explosive problem, the submerged explosive case is attractive from a computational point of view; it replaces sand, which is difficult to simulate and resists shear, with water, whose properties are well known. Studying this problem allows numerical uncertainties to be separated from sand modeling issues. The computational model is applied to a variety of charge depths and plate stand-offs
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