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Title
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Assessing the Efficacy of a GPU-Based MW-FDTD Method for Calculating Lightning Electromagnetic Fields Over Large-Scale Terrains
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Type
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JournalPaper
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Keywords
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Finite difference methods , Time-domain analysis , Lightning , Electromagnetic fields , Graphics processing units , Memory management , Electromagnetic compatibility
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Abstract
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This article presents for the first time an OpenACC (Open accelerators)-aided Graphics Processing Unit (GPU)-based approach adopting a 3D moving window finite difference time domain (MW-FDTD) method for calculating lightning electromagnetic fields over large-scale terrains. The efficacy and accuracy of the proposed method are evaluated by comparing its results with the results obtained from a conventional FDTD method. The results show that the GPU-based MW-FDTD method is capable of providing highly accurate results 42 times faster than the conventional CPU-based FDTD method. Moreover, the proposed method required only (2MNx)×100=40% . of the memory needed for carrying out the calculation compared to a conventional FDTD method, where M and Nx are the size of the entire domain in the conventional FDTD method and size of the divided blocks in the MW-FDTD method domain, respectively. The results show the applicability of the MW-FDTD-GPU method for dealing with lightning electromagnetic problems as well as large-scale electromagnetic compatibility (EMC) applications where the efficiency and minimization of the computational time and memory requirements are of great importance.
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Researchers
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Farhad Rachidi (Fifth Researcher), Marcos RubinStein (Fourth Researcher), mohammad azadifar (Third Researcher), hamidreza Karami (Second Researcher), (First Researcher)
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