Automatic CHIEF Point Selection for Finite Element–Boundary Element Acoustic Backscattering

Computing the backscattering of harmonic acoustic waves from underwater elastic targets arbitrary shapes is a challenging problem considerable practical significance. The finite element method well suited for discretization target, while boundary addresses radiation condition at infinity. A disadvantage integral that it yields non-unique solutions certain wavenumbers. This failure associated with existence eigensolutions Helmholtz equation in interior complement fluid domain (acoustic modes). combined formulation (CHIEF) credited to Schenk employed combine surface equations relation written down selected points within cavity scatterer (i.e., domain).The difficulty this approach has always been lack guidance on necessary number and their locations. solution proposed here compute modes using identify locations peaks.This novel aids decision as how many should be where they located. Our numerical experiments demonstrate robustness automatic selection CHIEF points’ numbers