Xq. Sheng et al., Scattering from a large body with cracks and cavities by the fast and accurate finite-element boundary-integral method, IEEE ANTENN, 48(8), 2000, pp. 1153-1160
A large body with cracks and cavities is a kind of typical structure widely
existing in realistic targets. In this paper, a newly developed fast and a
ccurate finite-element boundary-integral (FA-FE-BI) method is applied to co
mpute scattering by this kind of scatterers. A thorough analysis on this FA
-FE-BI numerical technique is presented, clearly demonstrating that this te
chnique has computational complexity O(N log N) and memory requirement O(N)
(N is the total number of surface unknowns). An inward-looking approach is
employed as a preconditioner to speed up the rate of convergence of iterat
ive solvers for this structure, Under these techniques, a powerful code is
developed for this kind of scatterers whose accuracy, efficiency, and capab
ility is well confirmed by various numerical results.