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Computer Simulations of Electrodynamical Energy Conversion by Magnetic Reconnection

磁重联电动能量转换的计算机模拟

基本信息

批准号：
61540308
负责人：
UGAI Masayuki
金额：
$ 0.77万
依托单位：
Ehime University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1986
资助国家：
日本
起止时间：
1986 至 1987
项目状态：
已结题

项目摘要

Theoretical studies of complicated space plasma phenomena has been done by computer simulations. Recent advance of supercomputers has largely facilitated the processing of many practical and important problems. The present project has been focused on the following two major subjects.(1) Appropriate algorithms for the effective processing of magnetohydrodynamic equations have been developed, and their validity has been examined by actually performing numerical computations. The algorithms have mainly been designed for numerical boundary conditions, numerical error check, etc.. In particular, algorithms relevant for supercomputing has been developed in rder to carry out three-dimensional MHD simulations within reasonable CPU time.(2) Next, on the basis of the algorithms developed, 2D MHD simulations have been done in order to study the basic physical mechanism involved in catastrophic events like flares, which has been one of the main topics in space plasma physics. We have then suggested an original physical model that states that rapid magnetic energy conversion responsible for flares can be realized by the spontaneous fast reconnection development. In particular, it has been demonstrated that a supersonic plasma jet, resulting from the fast reconnection, collides with a large-scale magnetic loop and causes a strong fast shock at the interface, which enables quite effective plasma heating along the loop.We now continue to develop the code of 3D MHD simulations relevant for supercomputers, and we are doing a 3D simulation with sufficiently precise computation.

利用计算机模拟对复杂的空间等离子体现象进行了理论研究。超级计算机的最新进展极大地方便了许多实际和重要问题的处理。本项目侧重于以下两个主要主题。(1)适当的算法的有效处理的磁流体动力学方程已经开发出来，其有效性已通过实际执行的数值计算进行了检查。这些算法主要用于数值边界条件、数值误差检验等。特别是，已经开发了与超级计算相关的算法，以便在合理的CPU时间内进行三维MHD模拟。(2)其次，在所开发的算法的基础上，为了研究空间等离子体物理的主要课题之一的耀斑等灾难性事件所涉及的基本物理机制，进行了二维MHD模拟。然后，我们提出了一个原始的物理模型，说明快速的磁能转换负责耀斑可以实现的自发快速重联发展。特别是，它已被证明，超音速等离子体射流，所产生的快速重联，碰撞一个大规模的磁回路，并在界面上造成强烈的快速冲击，这使得相当有效的等离子体加热沿着loop.We现在继续开发的代码的三维MHD模拟相关的超级计算机，我们正在做一个三维模拟与足够精确的计算。