基于国产十亿亿次超算系统的近连续过渡流区N-S/DSMC耦合算法并行优化研究  

Parallel optimization for coupling N-S/DSMC algorithm of near-continuum transitional flow region on 100P domestic supercomputing system

作　　者：徐金秀[1] 李中华[2] 孙俊[1] 李志辉[3] 郑岩[1] XU Jin-xiu;LI Zhong-hua;SUN Jun;LI Zhi-hui;ZHENG Yan(Jiangnan Institute of Computing Technology,Wuxi 214083;China Aerodynamics Research and Development Center,Mianyang 621000;National Laboratory for Computational Fluid Dynamics,Beijing 100191,China)

机构地区：[1]江南计算技术研究所,江苏无锡214083 [2]中国空气动力研究与发展中心,四川绵阳621000 [3]国家计算流体力学实验室,北京100191

出　　处：《计算机工程与科学》2019年第4期583-589,共7页Computer Engineering & Science

基　　金：国家973计划(2014CB744100);国家重点研发计划(2017YFB0202702);国家自然科学基金(91530319)

摘　　要：过渡流区气动问题的数值模拟一直是空气动力学领域的难点。首先介绍了在已有N-S解算器和DSMC方法研究基础上,采用MPC耦合技术建立N-S/DSMC耦合算法,把DSMC方法和N-S方法的应用范围拓展到近连续过渡流区。然后详述了基于国家超级计算无锡中心的国产十亿亿次超级计算机开展的耦合算法多级并行优化技术,并首次实现了耦合算法的众核并行。测试表明,本文的进程级优化技术取得了超线性加速比;众核级优化受制于原算法特点和系统特点没有取得预期效果,但进行了探讨和分析,为N-S/DSMC耦合算法的众核并行提供了研究和分析依据,为过渡流区高超声速气动特性数值模拟研究提供了有效的途径。The numerical simulation for near-continuum transitional flow region is a very challenging field of aerodynamics. We first introduce the Navier-Stokes (N-S) resolver and the direct simulation Monte Carlo (DSMC) method, based on which we propose an N-S/DSMC coupling numerical algorithm by developing the modular particle-continuum (MPC) technique. This extends the application range of the DSMC method and the N-S method to the transitional flow region. Then, we explain fully the multi-level parallel optimization techniques of the coupling algorithm on the 100P supercomputers in the National Supercomputing Center in Wuxi, and the many-core parallelization is realized for the first time. The tests show that the process-level optimization can obtain super-linear speedup. Though the many-core level optimization does not obtain the expected effect due to the features of the original algorithm and the computer architecture, we make in-depth discussion and analysis. Our research and analysis provide a reference for many-core parallelization of the coupling N-S/DSMC algorithm, and provide an effective approach for the numerical simulations of hypersonic aerodynamics.

关 键 词：高超声速过渡流 模块化的颗粒-连续模拟技术 耦合算法 OpenACC 

分 类 号：O246[理学—计算数学]