Negative magnetic viscosity in two dimensions
Negative magnetic viscosity in two dimensions
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DOI：
10.1134/1.559028
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发表时间：
1999-10
影响因子：
1.1
通讯作者：
A. Chechkin
中科院分区：
文献类型：
--
作者：
A. Chechkin
在二维磁流体力学的框架内研究了“负粘度”的发生。我们使用的假设是典型的小规模的字段上的大规模的，即研究时，小规模的MHD字段被假定为足够弱，联合平稳，均匀，并保持由外部源的影响。由于负粘度的大尺度场产生的标准推导出各种特殊形式的各向同性的小尺度场以及各向异性的，后者可以被视为MHD随机模拟的已知Kolmogorov流。
The occurrence of “negative viscosities” is studied within the framework of two-dimensional magnetohydrodynamics MHD. We use assumptions which are typical when studying the effects of smaller-scale fields on larger-scale ones, namely, the small-scale MHD fields are assumed to be sufficiently weak, jointly stationary, homogeneous, and maintained by external sources. The criteria of large-scale field generation due to negative viscosities are derived for various special forms of isotropic small-scale fields as well as anisotropic ones; the latter can be regarded as MHD stochastic analogs of the known Kolmogorov flow.