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arXiv 2005.03130physics.plasm-phphysics.space-ph
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准中性混合动力学模型的空间滤波技术

Space-filter techniques for quasi-neutral hybrid-kinetic models

S. S. Cerri, E. Camporeale

摘要:

空间滤波方法已被证明是研究中性流体中湍流的基本工具,提供了在位形空间中分析尺度到尺度能量传递的能力。众所周知,等离子体中的湍流提出了不同于中性流体的挑战,特别是当感兴趣的尺度包括动力学效应时。对于动力学等离子体,空间滤波器方法仍然在很大程度上未被探索。在这里,我们推导出空间过滤(或等效的“粗粒度”)方程的配置空间的准中性混合动力学等离子体模型,其中离子是完全动力学和电子是一个中和流体。不同的模型和封闭的电子流体被认为是,包括有限的电子惯性效应和全电子的压力张量动力学。在真实空间中的湍流波动的级联取决于不同的近似的影响进行了讨论。

英文摘要:

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.

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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