A Corner-Free Truncation Strategy in Three-Dimensional FDTD Computation

The corner-free truncation (CFT) strategy is proposed to improve the efficiency of numerical simulation in computational electrodynamics. The spherical boundary, namely the CFT strategy, is built up in the Cartesian coordinate system, which has been implemented via making use of the impedance-matched layer. The proposed CFT strategy is used for terminating computational domain of the conventional finite-difference time-domain (FDTD) to absorb the outward electromagnetic waves. Moreover, based on the proposed boundary, the computation becomes simpler. The original FDTD computational domain is reduced to be nearly a half, and the computational resource is saved significantly, both of which are due to the fact that no curvilinear model is applied in truncating the boundary. The numerical simulations of target scattering problems have been achieved to validate the proposed algorithm.