Mach number dependence of the onset of dynamo action
Mach number dependence of the onset of dynamo action
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发电机作用开始时的马赫数依赖性
DOI：
10.1111/j.1365-2966.2004.08127.x
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发表时间：
2004
影响因子：
4.8
通讯作者：
A. Mee
中科院分区：
文献类型：
--
作者：
N. Haugen;A. Brandenburg;A. Mee
使用直接模拟以及模拟与冲击捕获粘度，保持，但是，经常的磁扩散率的可压缩性的非螺旋湍流发电机行动的发病的影响。结果表明，临界磁雷诺数从亚音速区的约35增加到超音速区的约70。虽然与低分辨率激波捕捉模拟相比，高分辨率直接模拟中的激波结构更尖锐，但两种情况下的磁场看起来大致相似，并且没有显示任何激波结构。类似地，发电机动作的开始不受冲击捕获粘度的显著影响。
The effect of compressibility on the onset of non-helical turbulent dynamo action is investigated using both direct simulations as well as simulations with shock-capturing viscosities, keeping, however, the regular magnetic diffusivity. It is found that the critical magnetic Reynolds number increases from about 35 in the subsonic regime to about 70 in the supersonic regime. Although the shock structures are sharper in the high-resolution direct simulations compared with the low-resolution shock-capturing simulations, the magnetic field looks roughly similar in both cases and does not show any shock structures. Similarly, the onset of dynamo action is not significantly affected by the shock-capturing viscosity.