Electromagnetic particle-in-cell simulations on magnetic reconnection with adaptive mesh refinement
Electromagnetic particle-in-cell simulations on magnetic reconnection with adaptive mesh refinement
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DOI：
10.1016/j.cpc.2008.02.010
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发表时间：
2008-06
期刊：
影响因子：
--
通讯作者：
K. Fujimoto;R. Sydora
中科院分区：
文献类型：
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作者：
K. Fujimoto;R. Sydora
重新考虑了电磁粒子单元（EM-PIC）模型的自适应网格细化（AMR），使其能够正确有效地应用于与磁场重联相关的电流片演化。适当地选择单元格分裂的细化准则是非常重要的。它表明，精细的细胞不仅要分布在电子德拜长度小的区域，但也在电子尺度的结构预计是显着的区域。虽然AMR大大减少了细胞的数量，但总的模拟成本也受到粒子数量的控制。为了减少整个系统中的粒子总数，本代码通过分裂或合并粒子来控制每个单元的局部粒子数。结果表明，粒子分裂和合并是相当有效的，以及AMR，以提高效率的EM-PIC模拟。本文还介绍了一种由二维码扩展而来的三维码。针对撕裂不稳定性和低混杂漂移不稳定性对代码进行了检查，确认代码已成功开发。研究还发现，与二维模拟相比，使用AMR进行三维模拟可以获得更高的效率。
The electromagnetic particle-in-cell (EM-PIC) model using the adaptive mesh refinement (AMR) is reconsidered so that it is properly and efficiently applied to the current sheet evolution associated with magnetic reconnection. It is very important to adequately select the refinement criteria for cell splitting. It is demonstrated that fine cells have to be distributed not only in the region where the electron Debye length is small, but also in the region where the electron-scale structure is expected to be significant. While the AMR reduces the number of cells drastically, the total simulation cost is also controlled by the number of particles. In order to reduce the total number of particles in the entire system, the present code controls the local number of particles per cell by splitting or coalescing particles. It is shown that the particle splitting and coalescence are quite effective as well as the AMR to enhance the efficiency of the EM-PIC simulations. A new 3D code extended from the 2D code is also introduced. The code is checked against the tearing instability and the lower hybrid drift instability, and it is confirmed that the code has been successfully developed. It is also found that the 3D simulations can gain more efficiency by using the AMR than the 2D simulations.