Evolution simulation of lightning discharge based on a magnetohydrodynamics method  

作　　者：Fusheng WANG Xiangteng MA Han CHEN Yao ZHANG 王富生;马襄腾;陈汉;张耀(School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University)

机构地区：School of Mechanics,Civil Engineering and Architecture,Northwestern Polytechnical University,Xi＇an 710129,People＇ s Republic of China

出　　处：《Plasma Science and Technology》2018年第7期86-97,共12页等离子体科学和技术（英文版）

基　　金：supported by National Natural Science Foundation of China(No.51475369)

摘　　要：In order to solve the load problem for aircraft lightning strikes, lightning channel evolution is simulated under the key physical parameters for aircraft lightning current component C. A numerical model of the discharge channel is established, based on magnetohydrodynamics （MHD） and performed by FLUENT software. With the aid of user-defined functions and a user- defined scalar, the Lorentz force, Joule heating and material parameters of an air thermal plasma are added. A three-dimensional lightning arc channel is simulated and the arc evolution in space is obtained. The results show that the temperature distribution of the lightning channel is symmetrical and that the hottest region occurs at the center of the lightning channel. The distributions of potential and current density are obtained, showing that the difference in electric potential or energy between two points tends to make the arc channel develop downwards. The arc channel comes into expansion on the anode surface due to stagnation of the thermal plasma and there exists impingement on the copper plate when the arc channel comes into contact with the anode plate.In order to solve the load problem for aircraft lightning strikes, lightning channel evolution is simulated under the key physical parameters for aircraft lightning current component C. A numerical model of the discharge channel is established, based on magnetohydrodynamics （MHD） and performed by FLUENT software. With the aid of user-defined functions and a user- defined scalar, the Lorentz force, Joule heating and material parameters of an air thermal plasma are added. A three-dimensional lightning arc channel is simulated and the arc evolution in space is obtained. The results show that the temperature distribution of the lightning channel is symmetrical and that the hottest region occurs at the center of the lightning channel. The distributions of potential and current density are obtained, showing that the difference in electric potential or energy between two points tends to make the arc channel develop downwards. The arc channel comes into expansion on the anode surface due to stagnation of the thermal plasma and there exists impingement on the copper plate when the arc channel comes into contact with the anode plate.

关 键 词：lightning channel thermal plasma Magneto Hydro Dynamics （MHD） evolution simulation 

分 类 号：Q111[生物学—普通生物学] P427.321[天文地球—大气科学及气象学]