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research article

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

Hou, Wenhao
•
Azadifar, Mohammad  
•
Rubinstein, Marcos
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2020
IEEE Transactions on Electromagnetic Compatibility

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.

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Type
research article
DOI
10.1109/TEMC.2019.2917282
Author(s)
Hou, Wenhao
•
Azadifar, Mohammad  
•
Rubinstein, Marcos
•
Zhang, Qilin
•
Rachidi, Farhad  
Date Issued

2020

Published in
IEEE Transactions on Electromagnetic Compatibility
Volume

62

Issue

3

Start page

976

End page

980

Subjects

Arrival time delay

•

finite-difference time-domain (FDTD) efficiency

•

irregular terrain

•

lightning electromagnetic field

•

moving computational domain.

Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
SCI-STI-FR  
Available on Infoscience
June 17, 2020
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/169366
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