Accession Number : ADA301771

Title :   Spurious Fields in Time Domain Computations of Scattering Problems.

Descriptive Note : Contract rept.,

Corporate Author : INSTITUTE FOR COMPUTER APPLICATIONS IN SCIENCE AND ENGINEERING HAMPTON VA

Personal Author(s) : Kangro, Urve ; Nicolaides, Roy

PDF Url : ADA301771

Report Date : OCT 1995

Pagination or Media Count : 15

Abstract : In this paper two dimensional electromagnetic scattering problems with a time periodic incident field are considered. The scatterer is a perfect conductor, and an artificial boundary condition is used. The large time behavior of solutions, depending on (divergence free) initial conditions, is characterized. It turns out that in addition to the expected time-periodic solution the limiting solution may also contain a spurious stationary field. The source of the stationary field is explained and equations describing it are obtained. Several avoidance strategies are discussed, and numerical comparisons of these techiques are given.

Descriptors :   *ELECTROMAGNETIC SCATTERING, *MAXWELLS EQUATIONS, COMPUTATIONS, BOUNDARIES, SOLUTIONS(GENERAL), LIMITATIONS, STATIONARY, TIME DOMAIN, SPURIOUS EFFECTS.

Subject Categories : Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE