Solar wind, magnetosphere and ionosphere dynamics by using common parallel simulation codes

使用通用并行仿真代码的太阳风、磁层和电离层动力学

• 批准号: 14204046
• 负责人: OGINO Tatsuki
• 金额: $ 21.72万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14204046/
• 关键词: new-age parallel supercomputer; common parallel computing method; magnetohydrodynamic code; hybrid code; particle code; solar wind-magnetosphere interaction; magnetic reconnection; nonlinear physics in space plasma; 新世代並列型スーパーコンピュータ

In recent years, the supercomputer which can be used for large-scale simulation is changing from the vector-parallel machine quickly to the scalar-parallel machine. Hitachi and FUJITSU shift to marketing of a cluster type scalar-parallel machine even in Japan, and only NEC is continuing development of the vector-parallel machine. In order to achieve a high-efficient computation by scalar-parallel machine which will become the mainstream in future more and more, it is required that the order of array is changed in order to raise hit rate of the cache, and that the three-dimensional domain decomposition method and the communication method by the consolidation system are introduced. By development of new three-dimensional MHD (magnetohydrodynamic) code which satisfies such conditions, it can bring for the first time the possibility of the effective utilization of the large scale scalar-parallel machine. Of course, a high-speed hard transfer function is necessary. The 3D MHD code which has high efficiency of 40-70% in the vector-parallel machine can be certainly expectable that it exceeds 20% even in a scalar-parallel machine from the test calculation using this FUJITSU PRIMEPOWER HPC2500. Thus it turned out that many of MHD/Fluid, Particle and Hybrid codes written by MPI (message Passing Interface) Fortran aree executable with high performance even in the scalar-parallel supercomputers. These successful results in development of simulation codes have surely brought us to carry out a large-scale space simulation in order to study the magnetosphere and ionosphere dynamics and nonlinear kinetic phenomena in space physics.

近年来，可用于大规模仿真的超级计算机正在快速从矢量并联机器变为标量并行机器。即使在日本，日立和富士通也转向集群类型标量并行机器的营销，并且只有NEC正在继续开发矢量并行机器。为了通过标量 - 平行机器实现高效计算，将来将成为越来越多的主流，要求更改数组的顺序以提高缓存的命中率，并且三个 - 介绍了巩固系统的维域分解方法和通信方法。通过开发满足此类条件的新的三维MHD（磁流失动力学）代码，它可以首次带来有效利用大型标量平行机器的可能性。当然，需要高速硬传输功能。在矢量并联机器中具有高效率为40-70％的3D MHD代码肯定可以期望，即使使用此Fujitsu Prime Powers HPC2500，即使在测试计算中，它也超过了20％。因此，事实证明，即使在标量 - 平行的超级计算机中，MPI（消息传递接口）fortran aree编写的许多MHD/流体，粒子和混合代码也具有高性能。这些成功的仿真代码开发结果肯定使我们进行了大规模的空间模拟，以研究空间物理学中的磁层和电离层动力学以及非线性动力学现象。

项目成果

Joy, S.P.他: "Probabilistic models of the Jovian magnetosphere and bow shock locations"J.Geophys.Res.. 107, A10. 1309.doi : 10.1029-2001JA009146 (2002)

Joy, S.P. 等人：“木星磁层和弓形激波位置的概率模型”J.Geophys.Res.. 107，A10.doi：10.1029-2001JA009146 (2002)

Ionospheric electric potentials for substorms calculated from a solar wind-magnetosphere MHD simulation and a magnetogram inversion technique

通过太阳风磁层 MHD 模拟和磁力图反演技术计算出的亚暴电离层电势

• 发表时间: 2004
• 期刊: J.Geophys.Res. 109,A01211
• 作者: Matsuda;J.;A.Kawachi et al.;Nakata H. 他
• 通讯作者: Nakata H. 他

Spontaneous fast reconnection model in three dimensions

三维自发快速重连模型

• 发表时间: 2005
• 期刊: Phys. Plasmas Vol.12
• 作者: Y.Fujiyoshi;K.Yoshida;R.Enomoto et al.;Hisao Komatsu (小松久男);M.Ugai.他
• 通讯作者: M.Ugai.他

A simulation study of currents in the Jovian magnetosphere

木星磁层电流的模拟研究

• 发表时间: 2003
• 期刊: Planet.Space Sci. 51
• 作者: Walker;R.J. 他
• 通讯作者: R.J. 他

The geospace environment data analysis system

地球空间环境数据分析系统

• 发表时间: 2003
• 期刊: Adv.Space Res. 31
• 作者: Kamide;Y. 他
• 通讯作者: Y. 他