Weak scaling of the parallel immersed-finite-element particle-in-cell (PIFE-PIC) framework with lunar plasma charging simulations
Weak scaling of the parallel immersed-finite-element particle-in-cell (PIFE-PIC) framework with lunar plasma charging simulations
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DOI：
10.1007/s40571-022-00470-0
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发表时间：
2022-03
影响因子：
3.3
通讯作者：
D. Lund;Xiaoming He;Xu Zhang;D. Han
中科院分区：
文献类型：
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作者：
D. Lund;Xiaoming He;Xu Zhang;D. Han
研究了最近发展起来的一种完全动力学的三维并行浸没有限元粒子单元框架(PIFE-PIC)的弱标度性能。选择了一个名义上的一维等离子体电荷问题，即低太阳仰角下的月球光电子鞘，用最近导出的一维光电子鞘的半解析解来验证PIFE-PIC。弱尺度性能测试表明，PIFE-PIC的整体效率对宏观粒子数不敏感，与直觉相反的是，在PIC迭代的早期阶段，较多的区域分解迭代可能会导致较快的计算速度。然后将PIFE-PIC框架应用于模拟具有324,000个单元和1.5亿个宏观粒子的波状月球表面的等离子体充电，展示了PIFE-PIC解决月球表面附近局部尺度等离子体环境的能力。
Weak scaling performance of a recently developed fully kinetic, 3-D parallel immersed-finite-element particle-in-cell framework, namely PIFE-PIC, was investigated. A nominal 1-D plasma charging problem, the lunar photoelectron sheath at a low Sun elevation angle, was chosen to validate PIFE-PIC against recently derived semi-analytic solutions of a 1-D photoelectron sheath. The weak scaling performance test shows that the overall efficiency of PIFE-PIC is insensitive to the number of macroparticles and, counterintuitively, more domain decomposition iterations in the field-solve of PIC may lead to faster computing due to better convergence of field solutions at early stages of PIC iteration. The PIFE-PIC framework was then applied to simulate plasma charging of a wavy lunar surface with 324,000 cells and 150 million macroparticles demonstrating the capability of PIFE-PIC in resolving local-scale plasma environment near the surface of the Moon.