论文标题
准清晰杂种模型的空间过滤器技术
Space-filter techniques for quasi-neutral hybrid-kinetic models
论文作者
论文摘要
空间过滤器方法已证明是研究中性流体中湍流的基本工具，从而提供了分析配置空间中规模到规模能量传递的能力。众所周知，血浆中的湍流提出了与中性流体不同的挑战，尤其是当兴趣范围包括动力学效应时。对于动力学等离子体，空间过滤器方法仍未探索。在这里，我们为准中性杂交 - 运动等离子体模型提供了配置空间中的空间过滤（或等效的“粗粒”）方程，其中离子是完全动力学的，电子是中和的流体。考虑了电子流体的不同模型和封闭，包括有限的电子惯性效应和全电子的压力探测动力学。讨论了根据不同近似值的实际空间中湍流波动的含义。
The space-filter approach has proved a fundamental tool in studying turbulence in neutral fluids, providing the ability to analyze scale-to-scale energy transfer in configuration space. It is well known that turbulence in plasma presents challenges different from neutral fluids, especially when the scale of interests include kinetic effects. The space-filter approach is still largely unexplored for kinetic plasma. Here we derive the space-filtered (or, equivalently "coarse-grained") equations in configuration space for a quasi-neutral hybrid-kinetic plasma model, in which ions are fully kinetic and electrons are a neutralizing fluid. Different models and closures for the electron fluid are considered, including finite electron-inertia effects and full electrons' pressure-tensor dynamics. Implications for the cascade of turbulent fluctuations in real space depending on different approximations are discussed.
