电子
动能
物理
操作员(生物学)
回旋动理学
离子
守恒定律
计算物理学
碰撞
经典力学
欧拉路径
等离子体
原子物理学
统计物理学
量子力学
化学
拉格朗日
计算机科学
数学物理
转录因子
基因
托卡马克
计算机安全
生物化学
抑制因子
作者
M. Nakata,M. Nunami,T.‐H. Watanabe,H. Sugama
标识
DOI:10.1016/j.cpc.2015.08.007
摘要
A linearized collision operator, which preserves the conservation properties of particles, momentum, and energy, and the self-adjointness relation (H-theorem) for arbitrary particle species, is applied to Eulerian kinetic simulations of multi-species ions and electrons. Velocity-space grid number scans clarify that numerical errors in like-particle and unlike-ion collisions are sufficiently small under turbulence-simulation relevant resolutions. For electron–ion/ion–electron collisions, it is identified that highly steep and localized nature in the velocity-space leads to relatively larger conservation errors in the standard implementation without error corrections. In order to resolve such numerical difficulties, a modified field-particle operator based on the original one is newly constructed, so that the conservation properties are improved to achieve the round-off error levels. It is confirmed that the modified collision operator successfully reproduces the collisional relaxation of multi-species ions and electrons towards their equilibrium distributions satisfying the H-theorem.
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