A PEC Conformal FDTD Algorithm with Distorted Grid Face Filtering for Enhanced Efficiency.

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Bibliographic Details
Title:	A PEC Conformal FDTD Algorithm with Distorted Grid Face Filtering for Enhanced Efficiency.
Authors:	Liu, Chenshu¹ Shelleylcs@stu.xjtu.edu.cn, Fan, Kaihang¹ khfan@xjtu.edu.cn, Chen, Juan¹ chen.juan.0201@xjtu.edu.cn
Source:	Applied Computational Electromagnetics Society Journal. Mar2026, Vol. 41 Issue 3, p216-224. 9p.
Subjects:	Finite difference time domain method, Stability criterion, Electrical conductors, Numerical analysis, Computer performance
Abstract:	The finite-difference time-domain (FDTD) method suffers from accuracy loss when applied to curved targets due to the staircase approximation. To improve the surface fitting accuracy of curved perfect electric conductor (PEC) objects, the conformal finitedifference time-domain (CFDTD) has been introduced. However, when high-precision conformal cell fitting is performed, the time step in CFDTD is significantly reduced by the presence of distorted small cells, leading to much lower computational efficiency. In this paper, a novel PEC CFDTD algorithm with distorted grid face filtering is proposed, which allows a larger time step. By deriving the stability condition of CFDTD, a Conformal Distortion Index (CDI) is defined and used as a filtering criterion. The conformal cells are retained in regions with low CDI, while areas with high CDI are reverted to the staircase mesh. A sensitivity study on a PEC sphere is used to determine an optimal filtering ratio of 5%, under which the proposed method greatly improves computational efficiency while incurring only a minimal loss in accuracy. Numerical examples are presented to validate the effectiveness of the proposed method. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

Description
Abstract:	The finite-difference time-domain (FDTD) method suffers from accuracy loss when applied to curved targets due to the staircase approximation. To improve the surface fitting accuracy of curved perfect electric conductor (PEC) objects, the conformal finitedifference time-domain (CFDTD) has been introduced. However, when high-precision conformal cell fitting is performed, the time step in CFDTD is significantly reduced by the presence of distorted small cells, leading to much lower computational efficiency. In this paper, a novel PEC CFDTD algorithm with distorted grid face filtering is proposed, which allows a larger time step. By deriving the stability condition of CFDTD, a Conformal Distortion Index (CDI) is defined and used as a filtering criterion. The conformal cells are retained in regions with low CDI, while areas with high CDI are reverted to the staircase mesh. A sensitivity study on a PEC sphere is used to determine an optimal filtering ratio of 5%, under which the proposed method greatly improves computational efficiency while incurring only a minimal loss in accuracy. Numerical examples are presented to validate the effectiveness of the proposed method. [ABSTRACT FROM AUTHOR]
ISSN:	10544887
DOI:	10.13052/2026.ACES.J.410303