| 摘要: |
| 分析了时域有限差分(FDTD)网格的生成原理，提出了一种新型非均匀FDTD网格生成算法。该
算法通
过读取模型获得轴线上的不连续分界点，将整个空间沿x轴、y轴和z轴方向各
自分成多个区间；然后通过各区间的长度及其在模型中所处的位置，来确定该不同区间剖分
时所采用的具体网格生成算法，由此得到一种新型的分区递变非均匀网格。此算法能够完全
由程序实现，避免了普通网格剖分算法所带来的人为误差。在最大限度降低网格数量的同时
，克服了剖分算法中由于最大网格过大而导致的高频数值色散问题，使得最后的FDTD程序具
有计算时间短、收敛速度快的优点。 |
| 关键词: 非均匀网格 时域有限差分 高频数值色散 |
| DOI： |
|
| 基金项目: |
|
| An Improved Arithmetic for Generating Non uniform FDTD Grid |
| CHEN Xiao-yu,FANG Liang |
| (The Missile Institute, Air Force Engineering University, Sanyuan 713800, China) |
| Abstract: |
| The principle of generating FDTD(Finite Difference Time Domain) grid is analysed
,and an improved arithmetic for generating nonuniform FDTD grid is presented.
The arithmetic divide
s the whole space into many sections along the
x
axis, yaxis and zaxis, through reading the discontinuity point of th
e model. T
hen, According to the length of the section and its position in the model, it
chooses the arithmetic used when dividing the certain section. This arithm
etic is programmable and can avoid the artificial error, so it can overcome the
problem of numerical high frequency dispersion due to the unsuitabl
e grid size. |
| Key words: non-uniform grid FDTD high-frequency dispersion |
《电讯技术》编辑部 