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Isogeometric analysis (IGA) has proven to be an improvement on the classicalfinite element method (FEM) in several fields, including structural mechanicsand fluid dynamics. In this paper, the performance of IGA coupled with theinfinite element method (IEM) for some acoustic scattering problems isinvestigated. In particular, the simple problem of acoustic scattering by arigid sphere, and the scattering of acoustic waves by an elastic sphericalshell with fluid domains both inside and outside, representing a fullacoustic-structure interaction (ASI) problem. Finally, a mock shell and asimplified submarine benchmark are investigated. The numerical examples includecomparisons between IGA and the FEM. Our main finding is that the usage of IGAsignificantly increases the accuracy compared to the usage of $C^0$ FEM due toincreased inter-element continuity of the spline basis functions.

Isogeometric Analysis of Acoustic Scattering using Infinite Elements