论文标题
带有两流体等离子体模型的内爆式流动的Richtmyer-Meshkov不稳定
Richtmyer-Meshkov Instability of an Imploding Flow with a Two-Fluid Plasma Model
论文作者
论文摘要
在没有初始磁场的情况下，对圆柱光/重密度界面的两流体（离子和电子）等离子Richtmyer-Meshkov不稳定性进行了数值研究。在变化的debye长度尺度上，我们检查了电子和离子流体之间耦合的影响。当耦合变得强大时，电子被限于与离子共同移动，并且所得的进化与流体动力学中性流体情况相似。电子和离子之间发生的电荷分离会导致自构电磁场。我们表明，当电子和离子之间的耦合较弱时，Biermann电池效应主导了磁场的产生。除了在流量减速过程中雷利 - 泰勒稳定效应外，界面还通过诱导的时空变化的洛伦兹力加速。结果，与流体动力学病例相比，扰动发展到瑞利 - 泰勒不稳定性中，从而增强了扰动幅度。
The two-fluid (ions and electrons) plasma Richtmyer-Meshkov instability of a cylindrical light/heavy density interface is numerically investigated without an initial magnetic field. Varying the Debye length scale, we examine the effects of the coupling between the electron and ion fluids. When the coupling becomes strong, the electrons are restricted to co-move with the ions and the resulting evolution is similar to the hydrodynamic neutral fluid case. The charge separation that occurs between the electrons and ions results in self-generated electromagnetic fields. We show that the Biermann battery effect dominates the generation of magnetic field when the coupling between the electrons and ions is weak. In addition to the Rayleigh-Tayler stabilization effect during flow deceleration, the interfaces are accelerated by the induced spatio-temporally varying Lorentz force. As a consequence, the perturbations develop into the Rayleigh-Taylor instability, leading to an enhancement of the perturbation amplitude compared with the hydrodynamic case.
