地闪先导放电三维数值模拟  

Three-dimensional numerical simulation of cloud-to-ground lightning leaders discharge

作　　者：陈强[1] 魏光辉[1] 万浩江[1] 刘进[1] 祝天宇 代恩军[3] 

机构地区：[1]军械工程学院静电与电磁防护研究所 [2]军械士官学校高炮教研室 [3]72465部队

出　　处：《地球物理学进展》2010年第6期1977-1982,共6页Progress in Geophysics

基　　金：军内研究项目(7130933)资助

摘　　要：为探索地闪先导放电规律以满足新型雷电防护理论与技术研究的需要,在Amoruso和Lattarulo提出的带电圆盘雷云荷电解析模型框架下,利用三维WZ模型构造了地闪先导放电数值模拟算法,第一次实现了50m空间分辨率的地闪先导放电三维数值模拟.在解析模型框架下,求解空间大幅缩小,使高分辨率模拟成为可能.模拟过程中采用了SOR法求解七点差分格式的拉普拉斯方程,提出了双概率指数建模思想,对WZ模型进行了修正,反映了真实先导主通道的延伸性与丰富分岔的分形特征.进行了不同发展阈值下的模拟实验,得到了精细的地闪双向先导三维放电图样与先导激励下的地面电场分布,结果在一般观测范围内.To develop the technology of the lightning protection system, the high resolution simulation algorithm of cloud-to-ground lightning leaders discharge is designed based on 3-D Dielectric Breakdown Model（WZ model） in an analytic thunderstorm model. The space resolution is refined to 50m （analogized with stepped leader dimension） in the frame of the thunderstorm analytic model, for the simulation space is cut short. We get the space potential by solving the seven points＇ difference scheme Laplace equation with the Successive- Over-Relaxation method. Double probability exponents＇ method is presented in this paper. It is a correction to the WZ model and is able to describe the expansive character of main channel and the fractal character of abundant fork. Through simulation experiment with different breakdown develop thresholds, we obtained the elaborate cloud-to-ground lighting bidirectional leaders three- dimensional discharge graph and the ground electric field distribution under leaders excitation, which had guiding significance to development of new lightning protection theory and technology.

关 键 词：雷云荷电模型 电介质击穿模型 概率指数 SOR 地闪先导 放电模拟 

分 类 号：P483[天文地球—大气科学及气象学] P427