Structure-preserving geometric particle-in-cell algorithm suppresses finite-grid instability -- Comment on "Finite grid instability and spectral fidelity of the electrostatic Particle-In-Cell algorithm'' by Huang et al
Structure-preserving geometric particle-in-cell algorithm suppresses finite-grid instability -- Comment on "Finite grid instability and spectral fidelity of the electrostatic Particle-In-Cell algorithm'' by Huang et al
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发表时间：
2019-04
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通讯作者：
Jianyuan Xiao;H. Qin
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作者：
Jianyuan Xiao;H. Qin
Huang等人最近的一篇论文[Computer Physics Communications 207，123（2016）]彻底分析了标准Particle-In-Cell（PIC）方法的有限网格不稳定性（FGI）和光谱保真度。数值实验验证了能量守恒和动量守恒两种PIC方法的FGI。本文还建议进行类似的数值试验，以测试新开发的结构保持几何（SPG）-PIC算法。本文给出了数值实验的结果，表明SPG-PIC算法能够有效地抑制FGI。
A recent paper by Huang et al. [Computer Physics Communications 207, 123 (2016)] thoroughly analyzed the Finite Grid Instability(FGI) and spectral fidelity of standard Particle-In-Cell (PIC) methods. Numerical experiments were carried out to demonstrate the FGIs for two PIC methods, the energy-conserving algorithm and the momentum-conserving algorithm. The paper also suggested that similar numerical experiments should be performed to test the newly developed Structure-Preserving Geometric (SPG)-PIC algorithm. In this comment, we supply the results of the suggested numerical experiments, which show that the SPG-PIC algorithm is able to suppress the FGI.