时域有限差分法的一种新角点条件  

A new vertex condition of finite-difference time-domain method

作　　者：刘国高[1] 

机构地区：[1]河海大学常州校区数理部,江苏常州213022

出　　处：《河海大学学报（自然科学版）》2008年第6期860-862,共3页Journal of Hohai University(Natural Sciences)

基　　金：常州新北区科技攻关项目(XE20070614);江苏省社会发展科技项目(BS2007058)

摘　　要：时域有限差分法(FDTD)的很多吸收边界条件(ABC)都需要对角点做特殊处理.为克服已有FDTD角点条件的不足,提出了FDTD的一种新角点条件,其基本原理是:角点在2个或3个方向上引起反射,因此可从2个或3个方向上消除反射.数值实验表明该条件是有效的,具有适用面广、程序实现简单等优点.该条件还可推广用于区域边棱的特殊处理.Special treatment of vertices is needed when many absorbing boundary conditions of the finite difference timedomain method are used. In order to overcome the shortcomings of the existing vertex conditions, a new vertex condition was put forward. The fundamental principles of the condition were as follows： the vertex caused numerical reflection in 2 or 3 directions, and thus, the numerical reflection should be eliminated in 2 or 3 directions. Numerical experiments show that the vertex condition is valid and has the advantages of wider suitability and simpler realization of programs. In addition, the vertex condition can be popularized to the treatment of the edges.

关 键 词：时域有限差分法(FDTD) 吸收边界条件(ABC) 角点 数值反射 

分 类 号：TN011[电子电信—物理电子学]