发表机构
Centre for Mathematical Plasma Astrophysics, Department of Mathematics, KU Leuven; KU Leuven; IRFM - CEA Cadarache; CEA; CNRS; Royal Belgian Institute for Space Aeronomy（鲁汶大学数学系等离子体天体物理学中心; 鲁汶大学; CEA卡达拉舍聚变研究研究所; 法国原子能和替代能源委员会; 法国国家科学研究中心; 比利时皇家空间气象研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究采用结合CMM与NuFI的混合流映射策略，扩展框架为多映射策略以处理宽尺度分离问题，实现含完全动力学离子的KEEN动力学长期模拟，对比了动力学与静态离子对KEEN长期动力学的影响。
AI 中文摘要
我们采用结合特征映射法（CMM）与数值流迭代（NuFi）的混合流映射策略，重新研究了Afeyan等人2014年研究的动力学静电电子非线性（KEEN）波。本研究将经典设置扩展至动力学离子，对比了其与静态离子情形对KEEN长期动力学的影响。为此，我们为CMM-NuFI框架扩展了多映射策略，为离子和电子特征流各分配一个映射。所得问题存在空间与时间尺度的宽分离，由 ponderomotive 力产生的精细结构及大的离子-电子质量比驱动，这使得传统基于网格的方法计算上不可行。我们的多映射CMM-NuFI方法可高效解析这些不同尺度，实现含完全动力学离子的KEEN动力学长期模拟。
英文摘要
We revisit the kinetic electrostatic electron nonlinear (KEEN) waves studied by Afeyan et. al in 2014 using a hybrid flow-mapping strategy that combines the characteristic mapping method (CMM) with numerical flow iteration (NuFi). The study extends the classical setup to dynamical ions, comparing their impact on the long-time KEEN dynamics with the static-ion case. To this end, we extend the CMM-NuFI framework with a multi-map strategy, assigning one map to the ion and one to the electron characteristic flow. The resulting problem exhibits a wide separation of spatial and temporal scales, driven by the fine structures generated by the ponderomotive force and by the large ion-to-electron mass ratio, which renders it computationally prohibitive for conventional grid-based methods. Our multi-map CMM-NuFI method efficiently resolves these disparate scales, enabling long-time simulations of KEEN dynamics with fully dynamical ions.
CommentsThis paper was submitted to Springer Proceedings of the 34th International Symposium on Rarefied Gas Dynamics
