Resonant Multiple Scattering from Two Deformed Water-Entrained Air Bubbles

摘要

The theoretical description of acoustic scattering from single and multiplespherical air bubbles in water has received much attention. Recently, we investigated the monopole resonance behavior of a single deformed bubble, using the extended boundary condition (EBC) method. In the course of work aimed at predicting acoustic scattering from schools of fish (whose swimbladders are very similar to bubbles, but non-spherical and highly damped) we became interested in using the ERG method to accurately describe scattering from multiple deformed bubbles. As an approach to this problem, we have used the method to predict scattering from two closely spaced spheroidal bubbles, at frequencies close to the monopole resonance. The formalism is developed here in a form that isolates the two bubble correlation effect, and can be imposed in a subsequent many bubble case. The results indicate pronounced peak splitting, frequency shifting and amplitude variations of the monopole resonances.