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arXiv 1503.08334physics.plasm-phphysics.acc-phphysics.comp-ph
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Vlasov-Maxwell系统长时间大规模模拟的正则辛粒子网格法

Canonical symplectic particle-in-cell method for long-term large-scale simulations of the Vlasov-Maxwell system

Hong Qin, Jian Liu, Jianyuan Xiao, Ruili Zhang, Yang He, Yulei Wang, Yajuan Sun, Joshua W. Burby, Leland Ellison, Yao Zhou

摘要:

粒子模拟是等离子体物理中最重要的数值计算工具。然而,其长期准确性尚未确定。为了克服这个困难,我们发展了一个正则辛PIC方法的Vlasov-Maxwell系统通过离散其正则泊松括号。一个快速的局部算法来解决辛隐式时间推进被发现,没有根搜索或全局矩阵求逆,使所提出的方法的应用程序非常大规模的等离子体模拟与许多,例如,$10^{9}$,自由度。该算法的长期精度和保真度使我们能够用PIC方法数值验证Mouhot和Villani关于几个数量级的非线性Landau阻尼的理论和猜想,并计算从非常波到Bernstein波的模式转换过程中反射率的非线性演化。

英文摘要:

Particle-in-Cell (PIC) simulation is the most important numerical tool in plasma physics. However, its long-term accuracy has not been established. To overcome this difficulty, we developed a canonical symplectic PIC method for the Vlasov-Maxwell system by discretizing its canonical Poisson bracket. A fast local algorithm to solve the symplectic implicit time advance is discovered without root searching or global matrix inversion, enabling applications of the proposed method to very large-scale plasma simulations with many, e.g., $10^{9}$, degrees of freedom. The long-term accuracy and fidelity of the algorithm enables us to numerically confirm Mouhot and Villani's theory and conjecture on nonlinear Landau damping over several orders of magnitude using the PIC method, and to calculate the nonlinear evolution of the reflectivity during the mode conversion process from extraordinary waves to Bernstein waves.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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