弱电离等离子体中的Kelvin-Helmholtz不稳定性：双极主导流和Hall主导流
The Kelvin-Helmholtz instability in weakly ionised plasmas: Ambipolar dominated and Hall dominated flows
摘要：
众所周知，开尔文-亥姆霍兹不稳定性能够将良好有序的流动转化为更无序的，甚至是湍流的流动。因此，它可以代表一条路径，通过该路径，例如来自恒星喷流的弓形激波中的能量可以转换为湍流能量，从而驱动分子云湍流。我们提出了一套完整的多流体磁流体动力学模拟的结果，这种不稳定性，使用HYPERFORMANCE代码。我们调查的不稳定性的行为在霍尔为主和双极扩散为主的等离子体可能会在某些地区的吸积盘和分子云分别预期。我们发现，而线性增长率的不稳定性是不受多流体效应，非线性行为是显着不同的双极扩散去除大量的磁能，而霍尔效应，如果足够强，引入发电机效应，导致继续强劲增长的磁场以及进入非线性制度和缺乏真正的饱和的不稳定性。
英文摘要：
The Kelvin-Helmholtz instability is well known to be capable of converting well-ordered flows into more disordered, even turbulent, flows. As such it could represent a path by which the energy in, for example, bowshocks from stellar jets could be converted into turbulent energy thereby driving molecular cloud turbulence. We present the results of a suite of fully multifluid magnetohydrodynamic simulations of this instability using the HYDRA code. We investigate the behaviour of the instability in a Hall dominated and an ambipolar diffusion dominated plasma as might be expected in certain regions of accretion disks and molecular clouds respectively. We find that, while the linear growth rates of the instability are unaffected by multifluid effects, the non-linear behaviour is remarkably different with ambipolar diffusion removing large quantities of magnetic energy while the Hall effect, if strong enough, introduces a dynamo effect which leads to continuing strong growth of the magnetic field well into the non-linear regime and a lack of true saturation of the instability.
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