Tianhe supercomputers developed by the National University of Defense Technology won first place in the world's supercomputing TOP500 seven times. To exploit the high efficiency of those systems, the Tianhe team extracted the common key computing methods in large-scale scientific and engineering computing, designed and implemented scalable parallel algorithms for those methods according to the characteristics of the Tianhe supercomputers, and developed the Tianhe parallel algorithm libraries which are an important part of the Tianhe application-support environment. This paper first reviews the development history and system structures of Tianhe supercomputing systems. Subsequently, the architecture, functions, and performance of common parallel libraries such as grid processing libraries, partial differential equation discrete solving libraries, matrix computing libraries, particle transport libraries, collective communication libraries, and deep learning libraries are highlighted. Finally, a summary of typical application software on Tianhe supercomputers shows that the parallel algorithm libraries can effectively support the rapid development and performance optimization of typical application software.

2022年12月12日, 第八届高性能计算中间件技术研讨会(HPCMid22)成功召开。HPCMid (会议网址: http://www.caep-scns.ac.cn/HPCMid.php)每年举办一次, 面向科学与工程计算数值模拟应用在当前及下一代超级计算机上面临的挑战, 围绕高性能计算中间件关键技术, 邀请相关学者报告最新研究进展并探讨未来发展趋势。第八届研讨会以"适配新型体系结构的性能优化技术"为主题, 聚焦后摩尔时代新型体系结构为科学与工程计算带来的机遇与挑战, 探讨新型体系结构下可移植性能优化技术的发展趋势。本届研讨会的专家座谈(Panel Session)环节由莫则尧研究员和徐小文研究员共同主持, 邀请了王龙、刘杰、谭光明、刘伟峰、喻之斌5位来自高校、科研院所、企业的专家围绕"性能优化: 个性vs共性"这一主题开展了深入的讨论与交流, 翟季冬、杨海龙等多位专家也参与了讨论。专家们针对性能优化技术的研究现状与发展趋势、面临的问题与挑战以及人才培养等方面发表了许多有启发性的观点。《计算物理》编辑部特将本次讨论整理后发表, 以飨读者。限于篇幅, 略有删节。

For the unique magnetic structure of a compact fusion reactor, confinement dynamics of a single high-energy charged particle was studied with Monte Carlo method. Taking into account the local flatness characteristics of the magnetic field configuration, a charged particle moves basically in a constant magnetic field for a sufficiently small area or a short enough timestep. Therefore, a point-by-point analytical solution of particle motion equation that guarantees accurately conservation of energy is proposed, which has long-term tracking capabilities. Simulation results show that for high-energy deuterium particles with 1 keV energy distributed randomly in initial position and velocity direction, there is about a 7% probability that can be constrained to an order of 10 ms. Since the method for solving the motion equation is independent of magnetic configuration, it can be generalized naturally to arbitrary magnetic confinement setup.

Development of superintense laser technology has brought historic opportunities and space to expand for the study of interaction between light and matter. The process of nuclear reaction assisted by superintense laser field, especially the influence on cross sections of deuteron-triton fusion reaction, has attracted more and more attention. In this paper, we introduce the rapid development of laser technology and the wide application of superintense laser technology. Then we introduce the cross sections of nuclear fusion reaction and its influencing factors, and review recent progress in the study of light nuclear fusion cross sections in superintense laser field with emphasis on deuteron-triton fusion reaction. At last, we make some prospects for future development in this direction.

Accurate understanding of the microscopic occurrence state of water flooding residual oil in porous media is of great significance for improving the development effect of water flooding and enhancing the recovery factor of water flooding in high water cut oil fields. Based on the verification of the Volume of Fluid (VOF) method, influence of physical property conditions and displacement modes on the microscopic occurrence characteristics and recovery factor of remaining oil in ultra-high water cut sandstone reservoir was studied by making full use of its advantages of tracking the dynamic change of two-phase interface and reproducing the physical process of microscopic seepage. By analyzing the microscopic seepage characteristics of typical pore structures and the stress of remaining oil, mechanism and law of different types of microscopic remaining oil are revealed: The increase of displacement velocity and the change of displacement direction make the distribution of microscopic remaining oil dispersed and the recovery efficiency is improved in different degrees under the condition of water and humidity; As the oil is wet and the viscosity ratio is high, the capillary resistance and viscosity are great, the remaining oil is mostly clustered and porous, and the recovery degree is relatively low.