Finite-element analysis of scattering from a complex BOR using spherical infinite elements

摘要

Recently, a new type of infinite elements (IFEs) was proposed as an accurate and efficient mesh truncation method for the finite element analysis of open-region acoustic scattering. These IFEs are based on the radial expansion of the scattered field and are used to model the scattered field outside a separable surface characterized by a constant radial coordinate ( such as a spherical or a spheroidal surface in three dimensions). In this paper, spherical infinite elements are formulated and implemented for the finite element (FE) analysis of time-harmonic electromagnetic scattering from a complex body of revolution (BOR), and their performance is studied by comparison with the finite element solution using conventional absorbing boundary conditions (ABCs). Numerical results are presented to demonstrate that the new type of infinite elements is indeed more accurate than both the first- and second-order ABCs.