Hall and Gyro-Viscosity Effects on the Rayleigh-Taylor Instability in a 2D Rectangular Slab
Hall and Gyro-Viscosity Effects on the Rayleigh-Taylor Instability in a 2D Rectangular Slab
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DOI：
10.1585/pfr.9.1403076
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发表时间：
2014-06
影响因子：
0.8
通讯作者：
R. Goto;H. Miura;A. Ito;M. Sato;T. Hatori
中科院分区：
文献类型：
--
作者：
R. Goto;H. Miura;A. Ito;M. Sato;T. Hatori
数值研究了霍尔项和陀螺粘性对二维矩形板中Rayleigh-Taylor不稳定性的影响。具有这些效应的非线性磁流体力学(MHD)模拟表明，与单流体MHD情况相比，霍尔项和陀螺粘性项的结合导致不稳定模的增长率和饱和程度较低，而陀螺粘性项和霍尔项本身都没有表现出很强的稳定作用。结果还表明，即使动能饱和度降低，密度分布变得更加清晰，密度场的混合宽度仍能增长到与单流体MHD情况相同的程度。这些数值结果表明，MHD方程的推广可以导致低能级不稳定模的增长，但这并不一定意味着不稳定对平衡的影响较小。
Effects of the Hall term and the gyro-viscosity on the Rayleigh-Taylor instability in a 2D rectangular slab are studied numerically. Nonlinear magneto-hydrodynamic (MHD) simulations with these effects reveal that the combination of the Hall term and the gyro-viscosity causes the lower growth rates and the lower saturation level of unstable modes relative those in the single-fluid MHD case, while neither the gyro-viscosity nor the Hall term shows a strong stabilization effect only by itself. It is also shown that the mixing width of the density field can grow as large as that in the single-fluid MHD case, even though the saturation level of the kinetic energy is lowered and the detailed density profile becomes sharper. These numerical results suggest that the extension of the MHD equations can bring about a growth of unstable modes in a lower level, although it does not necessarily mean a weaker impact of the instability to the equilibrium.