Multiple-division subgrid construction for space-time finite integration electromagnetic field computation

Issue title: Proceedings from the 17th International Symposium on Applied Electromagnetics and Mechanics (ISEM 2015)

Guest editors: Fumio Kojima, Futoshi Kobayashi and Hiroyuki Nakamoto

Article type: Research Article

Authors: Sakata, Yuki^* | Washio, Naoya | Mifune, Takeshi | Matsuo, Tetsuji

Affiliations: Department of Electrical Engineering, Kyoto University, Kyoto, Japan

Correspondence: [*] Corresponding author: Yuki Sakata, Department of Electrical Engineering, Kyoto University, Kyoto, 615-8510, Japan. \linebreak E-mail:yuki1022@fem.kuee.kyoto-u.ac.jp

Abstract: This study proposes an efficient method of local space-time grid refinement and examines the numerical stability and the accuracy of electromagnetic field analysis using the space-time finite-integration technique (FIT). The proposed subgrid method locally refines the space-time grid with three-division or four-division and is stable without inducing numerical instability even after one million time-steps. The grid construction is modified at the corner part of subgrid connection to improve the computational accuracy. The staircase-type grid relaxes the time-step restriction due to the CFL condition.

Keywords: Finite integration technique, space-time grid, multiple-division, subgrid

DOI: 10.3233/JAE-162053

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 52, no. 1-2, pp. 617-622, 2016