A Spectral Solver for Acoustic Scattering by Multiple Quasi-Axisymmetric Structures

Acoustic scattering arises in a wide range of applications, including medical imaging, geophysical exploration, acoustic metamaterials, etc.

In this paper, we develop a fast and highly accurate algorithm for acoustic scattering by multiple quasi-axisymmetric objects, whose axis of rotation is an arbitrary curve.

The method is based on a Nyström discretization that combines Gauss-Legendre quadrature with the trapezoidal rule.

To treat the singular integrals that occur when target points are close to or coincide with source points, we reformulate them as evaluations of the modal Green's function and its derivatives, which are computed efficiently using the fast Fourier transform and convolution.

The multiple scattering solver is then constructed by coupling the single scatterer discretizations through inter-body boundary integral interactions.

We also present a convergence analysis for scattering problems with smooth geometries.

Numerical examples demonstrate the efficiency and accuracy of the proposed method for solving multiple scattering problems involving up to 1000 quasi-axisymmetric structures.