Numéro : 2617 - Year : 2012

Mitigation of under-water explosion effects by a bubble curtain mitigation of under-water explosion effects by a bubble curtain

Hervé GRANDJEAN, ENSTA Bretagne – Laboratoire Brestois de Mécanique et des Systèmes - Brest
Nicolas JACQUES, ENSTA Bretagne – Laboratoire Brestois de Mécanique et des Systèmes - Brest
Michel ARRIGONI, ENSTA Bretagne – Laboratoire Brestois de Mécanique et des Systèmes - Brest
Stéphane ZALESKI, Université Pierre et Marie Curie – Institut Jean le Rond d’Alembert - Paris

It has been experimentally proven that a bubble curtain can significantly mitigate the effects of an underwater explosion on structures and marine life. It is aimed in this study to model and understand the mechanisms responsible for the damping of a shock wave by a bubble screen, in order to improve its efficiency. A continuum model of diphasic liquid-bubbles mixtures has been developed, accounting for bubble dynamics effects. This model has been implemented in a finite element code. Comparisons with experimental results of the literature show a good agreement, and confirm the efficiency of bubble curtains against underwater explosions.

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