A fast kinematic dynamo in two-dimensional time-dependent flows
A fast kinematic dynamo in two-dimensional time-dependent flows
复制标题
二维瞬态流动中的快速运动发电机
DOI：
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发表时间：
1993
影响因子：
3.7
通讯作者：
N. Otani
中科院分区：
文献类型：
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作者：
N. Otani
对Bayly &奇尔德里斯（1988）提出的快速发电机模型的时间连续、常电阻率形式进行了数值研究。在这种情况下，预期发电机机制进行了描述，并示出在模拟操作。最快的增长模式的指数增长被观察到，与最小的电阻率尝试（1/Rm = 10-4）同意以及与Bayly-Childress模型的增长率。根据不同折射率下模的长、短波长特性，认为在Rm = 104情况下得到的增长率应在Rm → ∞时保持不变。
A time-continuous, constant-resistivity version of the fast dynamo model introduced by Bayly & Childress (1988) is studied numerically. The expected dynamo mechanism in this context is described and is shown to be operative in the simulations. Exponential growth of the fastest growing mode is observed, with the growth rate for the smallest resistivity attempted (1/Rm = 10-4) agreeing well with the Bayly–Childress model. It is argued, based on the long- and short-wavelength behaviour of the mode for different resistivities, that the growth rates obtained for the Rm = 104 case should persist as Rm → ∞.