摘要
为了计算地闪回击电流辐射场,采用时域有限差分(FDTD)法在二维柱坐标系下计算,选用柱坐标系下的完全匹配层(PML)吸收边界条件截断计算域。将计算结果分别与采用一阶Mur吸收边界条件得到的结果和采用Cooray-Rubinstein法得到精确的辐射场进行比较。比较结果表明:PML吸收边界条件的吸收效果优于一阶Mur吸收边界条件;与一阶Mur吸收边界条件相比,在计算结果达到同样精确的条件下,减小了计算域,缩短了计算时间。
The finite-difference time-domain（FDTD） method was used in 2-dimensional cylindrical coordinates to calculate the fields radiated by lightning return stroke,and the PML absorbing boundary condi- tions was adopted to truncate the computational domain. The calculated horizontal electric fields were respectively compared with the results obtained by the use of the first order Mur absorbing boundary conditions and the accurate results obtained by Cooray-Rubinstein formula. The results of the comparison show that the absorbing efficiency of PML absorbing boundary conditions is higher than that of the first order Mur and that PML reduces the computational domain and computation time while getting the same accurate results compared with the first order Mur absorbing boundary conditions.
出处
《解放军理工大学学报（自然科学版）》
EI
2007年第3期261-265,共5页
Journal of PLA University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(60671007
60471013)
