Acoustic scattering by prolate and oblate liquid spheroids.

EDMUNDO LAVIA; SILVIA BLANC; JUAN D. GONZÁLEZ; IGOR PRARIO

Buenos Aires

Congreso; 22nd International Congress on Acoustics 2016; 2016

The International Commission for Acoustics (ICA) and the Ibero-american Federation of Acoustics (FIA)

The problem of scattering of harmonic plane acoustic waves by liquid spheroids (prolate and oblate) is addressed from an analytical approach. Numerical implementation of the exact solution of the scalar wave Helmholtz equation in an unbounded domain with Sommerfeld radiation condition at infinity and boundary conditions for the interface medium-immersed liquid spheroid is presented. A general solution which is an expansion on prolate and oblate spheroidal functions is computed with no limiting assumption regarding neither eccentricity nor sound speed and density ratios values. The implemented code is basically derived from software recently released to public use. A high level solver layer code has been developed in Julia programming language. Predicted results have been verified for far-field and near-field results in agreement with previously reported approximate solutions. The software can be downloaded from authors? web site. This numerical implementation of the exact solution is applied in order to extend some benchmarks models of acoustic backscattering used in aquatic ecosystem research, namely, rigid-fixed, pressure-release, gas-filled, and weakly scattering.