Generation and saturation of large-scale flows in flute turbulence
Generation and saturation of large-scale flows in flute turbulence
复制标题
槽纹湍流中大规模流动的产生和饱和
DOI：
10.1063/1.1854688
复制
发表时间：
2005
影响因子：
2.2
通讯作者：
L. Vlahos
中科院分区：
文献类型：
--
作者：
I. Sandberg;H. Isliker;V. Pavlenko;K. Hizanidis;L. Vlahos
数值研究了磁曲率驱动静电槽失稳过程中大尺度各向异性模态的激发和抑制。流状结构的形成归因于不稳定性的线性发展，而带状模态的后续激发是线性生长的凹槽模态之间非线性耦合的结果。当纬向模态的振幅与流型模态的振幅相同时，槽的不稳定性得到抑制，而极向（纬向）流动占主导地位。在随后的饱和状态下，势和密度的主要大尺度模式以不同的方式自组织，这取决于离子温度的值。
The excitation and suppression of large-scale anisotropic modes during the temporal evolution of a magnetic-curvature-driven electrostatic flute instability are numerically investigated. The formation of streamerlike structures is attributed to the linear development of the instability while the subsequent excitation of the zonal modes is the result of the nonlinear coupling between linearly grown flute modes. When the amplitudes of the zonal modes become of the same order as that of the streamer modes, the flute instabilities get suppressed and poloidal (zonal) flows dominate. In the saturated state that follows, the dominant large-scale modes of the potential and the density are self-organized in different ways, depending on the value of the ion temperature.
影响因子：
2.2
作者：
Li, JQ;Kishimoto, Y
通讯作者：
Kishimoto, Y