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应用科学学报 ›› 2005, Vol. 23 ›› Issue (4): 428-431.

• 研究简报 • 上一篇    下一篇

ADI-FDTD在三维散射计算中的应用

王禹, 袁乃昌   

  1. 国防科技大学电子科学与工程学院, 湖南长沙 410073
  • 收稿日期:2004-04-24 修回日期:2004-06-29 出版日期:2005-07-31 发布日期:2005-07-31
  • 作者简介:王禹(1975-),男,辽宁本溪人,硕士生,E-mail:nudt@163.com;袁乃昌(1965-),男,安徽无为人,教授,博导.

The Application of ADI-FDTD for Three-Dimensional Scattering

WANG Yu, YUAN Nai-chang   

  1. School of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China
  • Received:2004-04-24 Revised:2004-06-29 Online:2005-07-31 Published:2005-07-31

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摘要： 基于交替方向隐式(ADI)技术的时域有限差分法(FDTD)是一种非条件稳定的计算方法,该方法的时间步长不受Courant稳定条件限制,而由数值色散误差决定.与传统的FDTD相比,ADI-FDTD增大了时间步长,缩短了总的计算时间.文中将该方法用于计算自由空间中三维目标的散射,给出了激励源以及总散场连接边界的设置.并将计算结果与FDTD结果对比,在具有同等精度的情况下,ADI-FDTD可大幅减少计算时间.

关键词: 时域有限差分法, 交替方向隐式技术, 散射

Abstract: An implicit finite difference time domain method using the principle of alternating direction implicit technique is unconditionally stable, and the maximum time step size is not limited by the CFL condition, but rather by numerical errors.Compared with the conventional FDTD method, the time step size of ADI-FDTD can be much larger, so it takes less time to simulate.In this paper ADI-FDTD is applied to simulate the scattering of three-dimensional targets in vacuum and the settings of excitation and total-field/scattered-field connecting boundary condition are derived.Compared with FDTD, the results of ADI-FDTD have the same lev el of accuracy as conventional FDTD and the CPU cost is obviously reduced.

Key words: FDTD, scattering, ADI

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