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In order to investigate turbulence in rotating fluids, we consider in this experimental-numerical study, the locally generated turbulence though inertial-wave focusing and the role of inertial waves in the inverse energy cascade and the transfer of momentum. With a vertically oscillating torus in a rotating fluid, two inertial waves cones are generated; their energy focusing at the apex of the wave cones. For large amplitude oscillations, turbulence is generated locally around the focal point resulting in angular momentum mixing and the generation of a columnar cyclonic vortex, suggesting that there are nonlinear dynamics underlying the wave induced transport of momentum towards columnar vortices in rotating turbulence. Quantitative data is acquired from Stereo PIV measurements and complementary information about the flow is obtained from high resolution numerical simulations.
Author(s):
Matias Duran Matute
NIOZ
Netherlands
Jan-Bert. FLOR
LEGI
France
Fabien Godeferd
LMFA EC Lyon
France