Resumen de A hybrid Krylov-subspace-exponential and finite-difference time integration approach for multiscale electromagnetic simulations

Jiawei Wang, Feng Chen, Jinghui Shao, Weichen Zhang, Xikui Ma

• Purpose This paper aims to present a novel hybrid time integration approach for efficient numerical simulations of multiscale problems involving interactions of electromagnetic fields with fine structures.

  Design/methodology/approach The entire computational domain is discretized with a coarse grid and a locally refined subgrid containing the tiny objects. On the coarse grid, the time integration of Maxwell’s equations is realized by the conventional finite-difference technique, while on the subgrid, the unconditionally stable Krylov-subspace-exponential method is adopted to breakthrough the Courant–Friedrichs–Lewy stability condition.

  Findings It is shown that in contrast with the conventional finite-difference time-domain method, the proposed approach significantly reduces the memory costs and computation time while providing comparative results.

  Originality/value An efficient hybrid time integration approach for numerical simulations of multiscale electromagnetic problems is presented.