基于超算暨HPIC-LBM的大时空尺度三维湍流磁重联数值模拟研究  

HPIC-LBM Method Based Simulation of Large Temporal-Spatial Scale 3D Turbulent Magnetic Reconnection on Supercomputer

作　　者：颜辉 朱伯靖[2] 万文 钟英 David A Yune YAN Hui;ZHU Bo-jing;WAN Wen;ZHONG Yin;David A YUNE(National Supercomputer Center in Guangzhou,Sun Yat-Sen University,Guangzhou 510006,China;Yunnan Observatories,Center for Astronomical Mega-Science,Chinese Academy of Sciences,Kunming 650216,China;Applied Physics and Applied Mathematics Department,Columbia University,New York 10027,USA)

机构地区：[1]中山大学国家超级计算广州中心,广州510006 [2]中国科学院云南天文台暨中国科学院天文大科学中心,昆明650216 [3]美国哥伦比亚大学应用物理和数学系,纽约10027

出　　处：《计算机科学》2019年第8期89-94,共6页Computer Science

基　　金：中国科学院前沿局重点项目(QYZDJ-SSW-SLH012);国家自然科学基金广东联合基金(U1501501);广东省引进创新创业团队项目(2016ZT06D211);中山大学超算应用培育专项资助

摘　　要：大时空尺度湍流磁重联(LTSTMR)是空间物理、太阳物理、宇宙学领域中一种普遍存在的爆发现象。磁能转移-释放-耗散、等离子体加热及高能粒子加速是研究该类现象的核心内容,而研究湍流在LTSTMR中如何起作用是解决以上问题的关键所在。2D/2.5D磁重联模型因其在物理图像简化方面忽略了自然界爆发现象的3D属性和本质。文中基于新型HPIC-LBM粒子算法,在天河2号平台上开展了LTSTMR十万核心级别的数值实验工作。首次获得了太阳大气活动磁重联精细演化(0~500 km)耗散区内oblique不稳定性证据。证明了耗散区内微观集体集合效应宏观表现的3种具体形式:湍流磁场self-generating-organization、湍动等离子体self-feeding-sustaining及磁场与等离子体间的相互作用。该研究为在超算平台上应用三维磁重联模型开展大时空尺度湍流磁重联提供了一种新途径。Large temporal-spatial scale turbulent magnetic reconnection(LTSTMR)is a general explosive astrophysical phenomena in space physics,solar physics and cosmology.To investigate this phenome,the mechanism of magnetic energy transfer-release-dissipation,plasma heating and acceleration of high energy particle should be learned,where the key is the role of turbulence.Previous 2D/2.5D simulation can only provide simplified physical pictures,which ignores the 3D nature and properties.By HPIC-LBM simulation on Tianhe-2 from National Supercomputer Center in Guang Zhou(NSCCGZ)with up to 100 000 CPU cores,the existence of oblique instability was firstly proved from fine structure simulation(0~500 km)of solar atmosphere activities.It also presented three kind of macroscopic representation inside the dissipation area:self-generating-organization,self-feeding-sustaining and interaction between magnetic field and plasma.This research provides a new tool for investigating 3D LTSTMR phenomenon on supercomputer.

关 键 词：HPIC-LBM 三维湍流磁重联 大时空尺度 磁能转移-释放-耗散 高能粒子加速 高性能计算 

分 类 号：O124[理学—数学] O453[理学—基础数学]