论文标题
二维静电磁化等离子体湍流中的腹部不保守和能量的正向级联
Enstrophy non-conservation and the forward cascade of energy in two-dimensional electrostatic magnetized plasma turbulence
论文作者
论文摘要
流体系统被得出以描述比给定物种的Larmor半径大的尺度上的静电磁化等离子体湍流。它与长谷山的方程式有关，但不保留肠胃植物，因此，它表现出向前的能量级联，以缩小。与长谷瓦人 - 米马恩斯特里氏菌的-5定律相比，惯性范围的能源比-11/3功率法更浅。 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].
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].
