Experimental observation of the geostrophic turbulence regime of rapidly rotating convection
Experimental observation of the geostrophic turbulence regime of rapidly rotating convection
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DOI：
10.1073/pnas.2105015118
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发表时间：
2021-11-01
影响因子：
11.1
通讯作者：
Gallet, Basile
中科院分区：
文献类型：
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作者：
Bouillaut, Vincent;Miquel, Benjamin;Gallet, Basile
行星和恒星内部的湍流对流和整体旋转之间的竞争控制着热量和示踪剂的传输以及磁场的产生。这些物体在从弱旋转对流到快速旋转对流的“地转湍流”状态的动力学状态下运行。然而，后一种状态在实验室中仍然难以捉摸，尽管在过去十年中，全世界都在努力设计更高的旋转对流单体。建立在最近的实验方法，对流驱动radiatively，我们报告的热传输测量与此标度制度的定量协议，实验标度律进行验证对直接数值模拟（DNS）的理想化设置。实验和DNS的标度指数与地转湍流预报结果吻合较好。标度律的前因子大于以前理想化数值研究中诊断出的前因子，这表明热传输效率对热源和热汇的精确分布具有意想不到的敏感性，而热源和热汇的精确分布在行星和恒星之间存在很大差异。
The competition between turbulent convection and global rota-tion in planetary and stellar interiors governs the transport of heat and tracers, as well as magnetic field generation. These objects operate in dynamical regimes ranging from weakly rotat -ing convection to the "geostrophic turbulence" regime of rapidly rotating convection. However, the latter regime has remained elusive in the laboratory, despite a worldwide effort to design ever-taller rotating convection cells over the last decade. Building on a recent experimental approach where convection is driven ra-diatively, we report heat transport measurements in quantitative agreement with this scaling regime, the experimental scaling law being validated against direct numerical simulations (DNS) of the idealized setup. The scaling exponent from both experiments and DNS agrees well with the geostrophic turbulence prediction. The prefactor of the scaling law is greater than the one diagnosed in previous idealized numerical studies, pointing to an unexpected sensitivity of the heat transport efficiency to the precise distribu-tion of heat sources and sinks, which greatly varies from planets to stars.