非磁化和磁化剪切层的演化
Evolution of Unmagnetized and Magnetized Shear Layers
摘要：
我们提出了数值模拟的Kelvin-Helmholtz不稳定性的增长和饱和的可压缩流体层与弱磁场。在没有磁场的情况下，不稳定性会产生单个涡流，使速度分布变平，从而使其稳定，免受进一步的扰动。添加弱磁场-弱的意义上说，它几乎没有对线性不稳定性的影响-导致由MHD力驱动的复杂的流动形态，并由于Maxwell应力而增强层的加宽。我们证实了早期的研究表明，磁场破坏的大规模的涡流结构，通过周期性循环的windup和电阻衰减，但我们表明，衰减率随等离子体电阻率降低，至少在我们的模拟访问的电阻率范围内。磁化增加了动量传输的效率，并且传输随着电阻率的降低而增加。
英文摘要：
We present numerical simulations of the growth and saturation of the Kelvin-Helmholtz instability in a compressible fluid layer with and without a weak magnetic field. In the absence of a magnetic field, the instability generates a single eddy which flattens the velocity profile, stabilizing it against further perturbations. Adding a weak magnetic field - weak in the sense that it has almost no effect on the linear instability - leads to a complex flow morphology driven by MHD forces and to enhanced broadening of the layer, due to Maxwell stresses. We corroborate earlier studies which showed that magnetic fields destroy the large scale eddy structure through periodic cycles of windup and resistive decay, but we show that the rate of decay decreases with decreasing plasma resistivity, at least within the range of resistivity accessible to our simulations. Magnetization increases the efficiency of momentum transport, and the transport increases with decreasing resistivity.
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