Two-dimensionalization of the flow driven by a slowly rotating impeller in a rapidly rotating fluid

  title={Two-dimensionalization of the flow driven by a slowly rotating impeller in a rapidly rotating fluid},
  author={Nathanael Machicoane and Fr{\'e}d{\'e}ric Moisy and Pierre-Philippe Cortet},
  journal={arXiv: Fluid Dynamics},
We characterize the two-dimensionalization process in the turbulent flow produced by an impeller rotating at a rate $\omega$ in a fluid rotating at a rate $\Omega$ around the same axis for Rossby number $Ro=\omega/\Omega$ down to $10^{-2}$. The flow can be described as the superposition of a large-scale vertically invariant global rotation and small-scale shear layers detached from the impeller blades. As $Ro$ decreases, the large-scale flow is subjected to azimuthal modulations. In this regime… 

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