On the Numerical Errors in the 2D FE/FDTD
Algorithm for different hybridization schemes
N. V. Venkatarayalu, Y. B. Gan and L.-W. Li
Abstract
Numerical experiments are carried out to study the
accuracy of the two-dimensional Finite-Element / Finite-
Difference Time - Domain (FE/FDTD) hybrid algorithm with
three different hybridization schemes. The physical space is split
into two domains viz., the finite difference (FD) and finite
element (FE) domains. In the FD domain, a uniform Cartesian
grid is used and in the FE domain, triangular elements with edge
vector basis functions are used. Newmark- ß scheme is used for
temporal discretization in the FE domain. The unphysical
reflections introduced by the FE domain for the different
schemes are compared by computing the 2D radar cross section
of the FE domain surrounded by the FD domain. Computed
results of scattering by a PEC circular cylinder for TEz incidence
using the three schemes and the traditional FDTD algorithm are
presented.
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