An Efficient FDTD Method to Calculate Lightning Electromagnetic Fields Over Irregular Terrain Adopting the Moving Computational Domain Technique

被引：9

作者：

Hou, Wenhao ^{[1
,2
]}

Azadifar, Mohammad ^{[2
]}

Rubinstein, Marcos ^{[3
]}

Zhang, Qilin ^{[1
]}

Rachidi, Fatine ^{[2
]}

机构：

[1] Nanjing Univ Informat Sci & Technol, Collaborat Innovat Ctr Forecast & Evaluat Meteoro, Key Lab Aerosol Cloud Precipitat, China Meteorol Adm,Key Lab Meteorol Disaster,Mini, Nanjing 210044, Peoples R China

[2] Swiss Fed Inst Technol, Electromagnet Compatibil Lab, CH-1015 Lausanne, Switzerland

[3] Univ Appl Sci Western Switzerland, CH-1401 Yverdon, Switzerland

来源：

IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY | 2020年 / 62卷 / 03期

基金：

国家重点研发计划; 中国国家自然科学基金;

关键词：

Finite difference methods; Time-domain analysis; Microsoft Windows; Lightning; Computational modeling; Delay effects; Arrival time delay; finite-difference time-domain (FDTD) efficiency; irregular terrain; lightning electromagnetic field; moving computational domain; PROPAGATION;

D O I：

10.1109/TEMC.2019.2917282

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We present an improved finite-difference time-domain (FDTD) method based on the moving computational domain technique for the calculation of lightning-generated fields over large-scale irregular terrain. In the improved method, a spatial window moving along with the wavefront at the speed of light is defined and, at each time step, the field components are updated only in that window. The time delay of the wavefront arrival caused by the propagation effect and the irregular terrain is considered when determining the width of the moving window. The efficiency and accuracy of the improved model are validated by comparing its results with those calculated by conventional FDTD, considering an example of lightning-radiated electromagnetic field propagation over complex mountainous terrain. The gain in the CPU time can be as high as a factor of 4 to 5, while the accuracy remains unchanged with respect to the conventional FDTD.

引用

页码：976 / 980

页数：5

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