Abstract

Acoustic wave scattering by prolate and oblate spheroids and finite cylinders immersed in water is compared when rigid body and elastic boundary conditions, respectively, are satisfied at the fluid–scatterer interface. The frequency dependence of the scattered farfield is obtained for various angles of incidence for both types of boundary conditions using the null field or T-matrix approach. From our computations it is concluded that only for restricted materials properties of the scatterer, scattering geometry and scatterer shape, the scattering characteristics of an elastic obstacle, and a rigid obstacle of the same shape are comparable up to wavelengths comparable to the size of the obstacle.

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