Fast calculation of electrostatic fields based on conformal mapping

To address the challenges of electrostatic field calculation for dynamic sources in complex terrains, this study proposes a computational strategy combining multi-level conformal mapping (CM) and the method of image (MI). By coordinating fractional linear transformations with the Cauchy integral the...

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Bibliographic Details
Published in:Engineering analysis with boundary elements Vol. 176; p. 106257
Main Authors: Guo, Nengxing, Li, Ruifang, Cao, Xiaobin, Liang, Yujing, Lei, Qian, Cai, Shuyan, Zhou, Jie, Xu, Yifan, Wen, Weibin
Format: Journal Article
Language:English
Published: Elsevier Ltd 01.07.2025
Subjects:
Boundary value problem
Cauchy integral theorem
Complex shape boundary
Conformal mapping
Electrostatic field calculation
Lightning distribution
Electrostatic field calculation
Boundary value problem
Cauchy integral theorem
Conformal mapping
Complex shape boundary
Lightning distribution
ISSN:0955-7997
Online Access:Get full text
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Summary:To address the challenges of electrostatic field calculation for dynamic sources in complex terrains, this study proposes a computational strategy combining multi-level conformal mapping (CM) and the method of image (MI). By coordinating fractional linear transformations with the Cauchy integral theorem, the actual terrain boundary was converted into a standard half-plane, establishing a mathematical model based on a single integral equation. The method demonstrates good adaptability for 2D smooth non-intersecting boundaries and 3D symmetric boundary scenarios, with the method of image simplifying repeated calculations in dynamic source scenarios. Numerical experiments reveal that in 2D planar fields, the maximum relative deviation between this method (CM-MI) and finite element method (FEM)/boundary element method (BEM) was <0.12 %. For 3D highly symmetric fields, deviations remained within 5 % for approximately 97 % of the spatial regions. Compared with FEM, the proposed method shows significant computational efficiency improvements in lightning leader development simulations - time consumption was reduced by two orders of magnitude during 40-step simulations. Preliminary experiments indicate that the method's simulation results for mountain lightning strike distribution align with actual statistical trends.
ISSN:0955-7997
DOI:10.1016/j.enganabound.2025.106257