A Subgridding Unconditionally Stable FETD Method Based on Local Eigenvalue Solution

作者：Kaihang Fan, Bing Wei, Xinbo He · 发表于：IEEE Transactions on Antennas and Propagation · 年份：2021 · DOI：10.1109/tap.2020.3048503 · 被引用次数：10 · 研究领域：Electromagnetic Simulation and Numerical Methods、Advanced Numerical Methods in Computational Mathematics、Advanced Mathematical Modeling in Engineering

A subgridding unconditionally stable finite-element time-domain method based on local eigenvalue solution (SUSL-FETD) is proposed to solve multiscale modeling. In this method, subgridding elements are used to discrete a multiscale computational domain, and the explicit central-difference method is applied for temporal discretization. Compared with traditional elements, the subgridding elements have a more complex distribution of edges and nodes. Therefore, an efficient subgridding scheme is given to form the element matrix for each subgridding element. Such system matrices assembled by all element matrices are symmetric. The subgridding FETD (S-FETD) is then further developed into the subgridding unconditionally stable FETD (SUS-FETD) by filtering spatial unstable modes. It is time-consuming to obtain the unstable modes by global eigenvalue decomposition. In this article, the local eigenvalue decomposition is proposed to get the unstable modes, which further reduces the memory storage and computing time. Numerical examples certify that the proposed SUSL-FETD has high accuracy and efficiency.