Practical experience in using absorbing boundary conditions with FDTD method

Abstract

DOI: 10.1049/cp:19960154 ISBN: 0 85296 657 1 Location: Bath, UK Conference date: 10-12 April 1996 Format: PDF When modelling electromagnetic problems, ideally an infinite free space beyond the boundary of the problem under study is modelled, through which waves propagate without being reflected at the problem's boundaries. Application of the first, second and modified second order absorbing boundary conditions are carried out. Large errors are introduced in the finite-difference-time-domain (FDTD) models due to reflections from the absorbing boundaries. Using problems with analytical solutions, the errors resulting from the comparison of the FDTD results with analytical solutions are used to decide on the overall size of a problem and on the minimum distance where the truncation of the computational space should occur. Inspec keywords: boundary-value problems; finite difference time-domain analysis; error analysis; electromagnetic wave absorption; electromagnetic wave propagation Subjects: Other numerical methods; Electromagnetic waves: theory; Numerical approximation and analysis; Electromagnetic wave propagation