The turbulent dynamo
The turbulent dynamo
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DOI：
10.1017/jfm.2020.1055
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发表时间：
2019-07
影响因子：
3.7
通讯作者：
Steven M. Tobias
中科院分区：
文献类型：
--
作者：
Steven M. Tobias
摘要导电流体中磁场的产生涉及流体湍流、旋转和磁场的复杂非线性相互作用。这个发电机过程在天体物理学、行星科学和天体物理学中非常重要，因为已知磁场在这些系统的动力学中起着关键作用。本文为流体力学工作者介绍发电机理论。它通过奠定基础，介绍发电机理论的核心方程和技术，然后提出一些简单的发电机解决方案。目前行使发电机理论家的问题，然后介绍，沿着试图取得进展。本文最后的论点，发电机理论的进展将在未来利用和推进一些目前的突破，中性流体湍流，如在过渡，自我维持的过程中，湍流/平均流的相互作用，统计和数据驱动的方法和维护和失去平衡。
Abstract The generation of a magnetic field in an electrically conducting fluid generally involves the complicated nonlinear interaction of flow turbulence, rotation and field. This dynamo process is of great importance in geophysics, planetary science and astrophysics, since magnetic fields are known to play a key role in the dynamics of these systems. This paper gives an introduction to dynamo theory for the fluid dynamicist. It proceeds by laying the groundwork, introducing the equations and techniques that are at the heart of dynamo theory, before presenting some simple dynamo solutions. The problems currently exercising dynamo theorists are then introduced, along with the attempts to make progress. The paper concludes with the argument that progress in dynamo theory will be made in the future by utilising and advancing some of the current breakthroughs in neutral fluid turbulence such as those in transition, self-sustaining processes, turbulence/mean-flow interaction, statistical and data-driven methods and maintenance and loss of balance.