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Two-dimensionalization of the flow driven by a slowly rotating impeller in a rapidly rotating fluid
Phys. Rev. Fluids 1, 073701 – Published 29 November, 2016
DOI: https://doi.org/10.1103/PhysRevFluids.1.073701
Abstract
We characterize the two-dimensionalization process in the turbulent flow produced by an impeller rotating at a rate in a fluid rotating at a rate around the same axis for Rossby number down to . 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 decreases, the large-scale flow is subjected to azimuthal modulations. In this regime, the shear layers can be described in terms of wakes of inertial waves traveling with the blades, originating from the velocity difference between the nonaxisymmetric large-scale flow and the blade rotation. The wakes are well defined and stable at low Rossby number, but they become disordered at of order of 1. This experiment provides insight into the route towards pure two-dimensionalization induced by a background rotation for flows driven by a nonaxisymmetric rotating forcing.
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