混合流体-PIC物理建模及其在激光聚变中的应用  

Hybrid Fluid-PIC Modeling and Its Application in Laser Fusion

作　　者：蔡洪波[1,2] 许育培 姚沛霖 张恩浩 黄翰霄 朱少平[1,3] 贺贤土 CAI Hongbo;XU Yupei;YAO Peilin;ZHANG Enhao;HUANG Hanxiao;ZHU Shaoping;HE Xiantu(Institute of Applied Physics and Computational Mathematics,Beijing 100094,China;Center for Applied Physics and Technology,and College of Engineering,Peking University,Beijing 100871,China;Graduate School,China Academy of Engineering Physics,Beijing 100088,China;Department of Engineering Physics,Tsinghua University,Beijing 100084,China;Center for Applied Physics and Technology,School of Physics and College of Engineering,Peking University,Beijing 100871,China)

机构地区：[1]北京应用物理与计算数学研究所,北京100094 [2]北京大学应用物理与技术研究中心,工学院,北京100871 [3]中国工程物理研究院研究生院,北京100088 [4]清华大学工程物理系,北京100084 [5]北京大学应用物理与技术研究中心,物理学院,北京100871

出　　处：《计算物理》2023年第2期159-168,共10页Chinese Journal of Computational Physics

基　　金：国家自然科学基金(11975055)资助项目。

摘　　要：本文探索性地建立混合流体-PIC(particle-in-cell)模拟方法,电子用无质量的流体描述,多组分离子用PIC粒子描述;流体运动通过求解电子磁流体方程组来获得,电磁场通过求解Ohm定律和Faraday定律来获得。针对激光聚变等离子体条件,利用混合流体-PIC模拟研究高能量密度条件下冲击波结构及其特性、流体力学界面不稳定性演化的影响等问题。混合流体-PIC物理建模为研究等离子体效应对冲击波和界面不稳定性的影响提供了新的研究手段。The influence of plasma effect on the shock wave and hydrodynamic instabilities is a widely concerned problem in the current research of laser fusion.However,due to the limitations of the numerical simulation methods,there is still a lack of research tools on this issue.In this work,a hybrid fluid PIC(particle-in-cell)simulation method is established tentatively.Electrons are described by a massless fluid,and multi-component ions are described by PIC method;The fluid motion is obtained by solving the equations of electro-magnetohydrodynamic,and the electromagnetic fields are obtained by solving Ohm’s law and Faraday’s law.Aiming at the plasma condition of laser fusion,we use hybrid fluid-PIC simulation to study the shock wave structure and its characteristics in high energy density conditions,and the influence of plasma effect on the evolution of hydrodynamic instabilities.Hybrid fluid-PIC physical modeling provides a new research method for studying the effect of plasma effect on shock wave and hydrodynamic instabilities under high energy density.

关 键 词：激光聚变 混合流体-particle-in-cell物理建模 冲击波 流体力学界面不稳定性 

分 类 号：O534[理学—等离子体物理]