有效修正ADI-FDTD算法中数值色散的方法  

Efficacious Method to Correct Numerical Dispersion in ADI-FDTD

作　　者：党涛[1] 郑宏兴[1] 

机构地区：[1]中国民用航空学院通信与信息处理研究所,天津300300

出　　处：《中国民航学院学报》2005年第3期28-31,共4页Journal of Civil Aviation University of China

基　　金：中国博士后科学基金资助项目(2003033028).

摘　　要：针对变换方向隐式(ADI)时域有限差分(FDTD)算法提出了一种改进方法,通过添加各向异性参数来修正相速度误差,从而减少数值色散,提高计算精度。给出了改进后的ADI-FDTD计算公式,并对改进算法的稳定性、色散关系以及各向异性参数的选取进行了研究,数值结果证明了所给方法的有效性。An innovated method is created pertaining to the traditional alternating-direction implicit(ADI) approach,which is aimed at decreasing anisotropy parameters in ADI-FTDD formula so as to decrease color dispersion and ensure accuracy of calculation. A formula is given for an algorithm of ADI-FDTD and research is conducted on the stability,on the relationship of color dispersion,as well as on the selection of anisotropy parameters. The method is proved effective with numerical result.

关 键 词：时域有限差分 各向异性 相速度 数值色散 

分 类 号：O441.4[理学—电磁学]