MEAN-FIELD MODELING OF AN α2 DYNAMO COUPLED WITH DIRECT NUMERICAL SIMULATIONS OF RIGIDLY ROTATING CONVECTION
MEAN-FIELD MODELING OF AN α2 DYNAMO COUPLED WITH DIRECT NUMERICAL SIMULATIONS OF RIGIDLY ROTATING CONVECTION
复制标题
α2 发电机的平均场建模与刚性旋转对流的直接数值模拟相结合
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
T. Sano
中科院分区：
文献类型：
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作者：
Y. Masada;T. Sano
采用笛卡尔几何直接数值模拟方法，探讨了刚性旋转分层对流中大尺度发电机的机制。一个平均场发电机模型也构造使用湍流速度剖面一致提取相应的DNS结果。通过与平均场模型的定量比较，证明了对流层中激发和维持的振荡α2发电机波是导致周期性极性反转和时空迁移等大尺度磁活动的主要原因。这些结果提供了强有力的证据，表明α效应的不均匀性，这是旋转分层对流的自然结果，即使没有Ω效应，也可能是大尺度恒星发电机的重要先决条件。
The mechanism of large-scale dynamos in rigidly rotating stratified convection is explored by direct numerical simulations (DNS) in Cartesian geometry. A mean-field dynamo model is also constructed using turbulent velocity profiles consistently extracted from the corresponding DNS results. By quantitative comparison between the DNS and our mean-field model, it is demonstrated that the oscillatory α2 dynamo wave, excited and sustained in the convection zone, is responsible for large-scale magnetic activities such as cyclic polarity reversal and spatiotemporal migration. The results provide strong evidence that a nonuniformity of the α-effect, which is a natural outcome of rotating stratified convection, can be an important prerequisite for large-scale stellar dynamos, even without the Ω-effect.
旋转可压缩对流中大尺度磁场产生问题
影响因子：
3.7
作者：
Favier B
通讯作者：
Favier B