论文标题
三维重新连接的流体模拟，以捕获下杂交漂移不稳定
Fluid Simulations of Three-Dimensional Reconnection that Capture the Lower-Hybrid Drift Instability
论文作者
论文摘要
近似动力学效应的流体模型最近在大规模等离子体（例如行星磁层）的建模中受到了关注。在三维重新连接中，重新连接本身和当前表不稳定性都需要适当地表示。我们表明，基于压力梯度的热通量闭合使十矩流体模型能够在重新连接模拟中捕获下杂交漂移不稳定性（LHDI）的关键特性。通过动力学和流体连续模型检查了不稳定性的特征，并分析了其在三维重新连接模拟中的作用。电磁LHDI的饱和水平高于预期，这导致当前纸的扭结很强。因此，初始扰动的大小对所得湍流有重大影响。
Fluid models that approximate kinetic effects have received attention recently in the modelling of large scale plasmas such as planetary magnetospheres. In three-dimensional reconnection, both reconnection itself and current sheet instabilities need to be represented appropriately. We show that a heat flux closure based on pressure gradients enables a ten moment fluid model to capture key properties of the lower-hybrid drift instability (LHDI) within a reconnection simulation. Characteristics of the instability are examined with kinetic and fluid continuum models, and its role in the three-dimensional reconnection simulation is analysed. The saturation level of the electromagnetic LHDI is higher than expected which leads to strong kinking of the current sheet. Therefore, the magnitude of the initial perturbation has significant impact on the resulting turbulence.
