An Efficient Parallel Hybrid Method of FEM-MLFMA for Electromagnetic Radiation and Scattering Analysis of Separated Objects

Authors

  • Sheng Zuo Shaanxi Key Laboratory of Large Scale Electromagnetic Computing Xidian University, Xi’an, Shaanxi 710071, China
  • Zhongchao Lin Shaanxi Key Laboratory of Large Scale Electromagnetic Computing Xidian University, Xi’an, Shaanxi 710071, China
  • Zheng Yue Shaanxi Key Laboratory of Large Scale Electromagnetic Computing Xidian University, Xi’an, Shaanxi 710071, China
  • Daniel García Doñoro Shaanxi Key Laboratory of Large Scale Electromagnetic Computing Xidian University, Xi’an, Shaanxi 710071, China
  • Yu Zhang Shaanxi Key Laboratory of Large Scale Electromagnetic Computing Xidian University, Xi’an, Shaanxi 710071, China
  • Xunwang Zhao Shaanxi Key Laboratory of Large Scale Electromagnetic Computing Xidian University, Xi’an, Shaanxi 710071, China

Keywords:

Hybrid method, finite element method (FEM), multilevel fast multipole algorithm (MLFMA), mesh truncation technique, parallel computing

Abstract

In order to meet the rapidly increasing demand for accurate and efficient analysis of complex radiating or scattering structures in the presence of electrically large objects, a finite element method (FEM)-multilevel fast multipole algorithm (MLFMA) hybrid method that based on the Finite Element-Iterative Integral Equation Evaluation (FE-IIEE) mesh truncation technique is proposed in this paper. The present method makes use of FEM for the regions with small and complex features and MLFMA for the analysis of the electrically large objects, which ensure the accuracy and applicability of the method are better than most commonly adopted FEM-high frequency technique (HFT) hybrid method. The mutual interactions between regions are taken into account in a fully coupled way through iterative near filed computation process. In order to achieve an excellent performance, both algorithms have been implemented together from scratch, being able to run over multi CPU cores. An efficient parallel FEM domain decomposition method (DDM) solver with exploiting geometrical repetitions is included to drastically reduce memory requirements and computational time in the calculation of large array antenna. Also, the parallel MLFMA is adopted to expedite the near-field information exchange between regions. Through numerical example, the effect of distance between regions on the convergence of the proposed hybrid method is studied, and it is shown that the proposed method converge well even if the distance is equal to 0.05λ. Through comparisons with an in-house higher order method of moments (HOMoM) code and commercial software FEKO, the accuracy and effectiveness of the implemented parallel hybrid method are validated showing excellent performance.

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Author Biography

Sheng Zuo, Shaanxi Key Laboratory of Large Scale Electromagnetic Computing Xidian University, Xi’an, Shaanxi 710071, China

Sheng Zuo was born in 1992 in Hunan, China. He received the M.S. degree in Electronics and Communications Engineering and Ph.D. degree in Electromagnetic Field and Microwave Technology from Xidian University in 2017 and 2020, respectively. Since July 2020 he is an Associate Researcher at Xidian University and committed to high frequency electromagnetic simulation software development. His research activities and interests are focused in large-scale parallel finite element method, domain decomposition method and finite element - boundary integral equation method.

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Published

2020-10-01

How to Cite

[1]
Sheng Zuo, Zhongchao Lin, Zheng Yue, Daniel García Doñoro, Yu Zhang, and Xunwang Zhao, “An Efficient Parallel Hybrid Method of FEM-MLFMA for Electromagnetic Radiation and Scattering Analysis of Separated Objects”, ACES Journal, vol. 35, no. 10, pp. 1127–1136, Oct. 2020.

Issue

2020: Vol 35 Iss 10

Section

Articles