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Dispersion and the speed-limited particle-in-cell algorithm
Physics of Plasmas ( IF 2.2 ) Pub Date : 2021-06-30 , DOI: 10.1063/5.0046935 Thomas G. Jenkins 1 , Gregory R. Werner 2 , John R. Cary 1, 2
Physics of Plasmas ( IF 2.2 ) Pub Date : 2021-06-30 , DOI: 10.1063/5.0046935 Thomas G. Jenkins 1 , Gregory R. Werner 2 , John R. Cary 1, 2
Affiliation
This paper discusses temporally continuous and discrete forms of the speed-limited particle-in-cell (SLPIC) method first treated by Werner et al. [Phys. Plasmas 25, 123512 (2018)]. The dispersion relation for a 1D1V electrostatic plasma whose fast particles are speed-limited is derived and analyzed. By examining the normal modes of this dispersion relation, we show that the imposed speed-limiting substantially reduces the frequency of fast electron plasma oscillations while preserving the correct physics of lower-frequency plasma dynamics (e.g., ion acoustic wave dispersion and damping). We then demonstrate how the time step constraints of conventional electrostatic particle-in-cell methods are relaxed by the speed-limiting approach, thus enabling larger time steps and faster simulations. These results indicate that the SLPIC method is a fast, accurate, and powerful technique for modeling plasmas wherein electron kinetic behavior is nontrivial (such that a fluid/Boltzmann representation for electrons is inadequate) but evolution is on ion timescales.
中文翻译:
色散和限速粒子细胞内算法
本文讨论了由 Werner等人首先处理的限速粒子胞内 (SLPIC) 方法的时间连续和离散形式。[物理。等离子25, 123512 (2018)]。推导并分析了快粒子限速的1D1V静电等离子体的色散关系。通过检查这种色散关系的正常模式,我们表明强加的速度限制显着降低了快速电子等离子体振荡的频率,同时保留了低频等离子体动力学的正确物理学(例如,离子声波色散和阻尼)。然后,我们展示了如何通过限速方法放宽传统静电粒子电池方法的时间步长限制,从而实现更大的时间步长和更快的模拟。这些结果表明 SLPIC 方法是一种快速、准确、
更新日期:2021-06-30
中文翻译:
色散和限速粒子细胞内算法
本文讨论了由 Werner等人首先处理的限速粒子胞内 (SLPIC) 方法的时间连续和离散形式。[物理。等离子25, 123512 (2018)]。推导并分析了快粒子限速的1D1V静电等离子体的色散关系。通过检查这种色散关系的正常模式,我们表明强加的速度限制显着降低了快速电子等离子体振荡的频率,同时保留了低频等离子体动力学的正确物理学(例如,离子声波色散和阻尼)。然后,我们展示了如何通过限速方法放宽传统静电粒子电池方法的时间步长限制,从而实现更大的时间步长和更快的模拟。这些结果表明 SLPIC 方法是一种快速、准确、