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 10-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.

中文翻译：

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捕获低混合漂移不稳定性的三维重联的流体模拟

近似动力学效应的流体模型最近在大型等离子体（如行星磁层）的建模中受到关注。在三维重联中，重联本身和电流片的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 10 矩流体模型能够在重新连接模拟中捕获低混合漂移不稳定性 (LHDI) 的关键特性。用动力学和流体连续体模型检查了不稳定性的特征，并分析了其在三维重联模拟中的作用。电磁 LHDI 的饱和水平高于预期，导致电流片强烈扭结。所以，