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arXiv 2008.03018physics.plasm-ph
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二维静电磁化等离子体turbulence中的拟能不守恒和能量前向级联

Enstrophy non-conservation and the forward cascade of energy in two-dimensional electrostatic magnetized plasma turbulence

G. G. Plunk

摘要:

一个流体系统推导出描述静电磁化等离子体湍流的尺度略大于拉莫尔半径的一个给定的物种。它与长谷川-三马方程有关,但不守恒涡度拟能,因此,在小尺度上表现出向前的能量级联。与长谷川-三马涡度拟能级联的-5定律相比,惯性范围能谱被认为比-11/3幂律更浅。在此通过流体系统的直接数值模拟证实的该性质可以帮助解释在流光主导的电子温度梯度驱动的湍流的陀螺动力学模拟中观察到的波动谱[Plunk等人,2019年],也可能是一些离子温度梯度驱动的湍流情况下,带状流被抑制[Plunk等人,2017年]。

英文摘要:

A fluid system is derived to describe electrostatic magnetized plasma turbulence at scales somewhat larger than the Larmor radius of a given species. It is related to the Hasegawa- Mima equation, but does not conserve enstrophy, and, as a result, exhibits a forward cascade of energy, to small scales. The inertial-range energy spectrum is argued to be shallower than a -11/3 power law, as compared to the -5 law of the Hasegawa-Mima enstrophy cascade. This property, confirmed here by direct numerical simulations of the fluid system, may help explain the fluctuation spectrum observed in gyrokinetic simulations of streamer-dominated electron-temperature-gradient driven turbulence [Plunk et al., 2019], and also possibly some cases of ion-temperature-gradient driven turbulence where zonal flows are suppressed [Plunk et al., 2017].

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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