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Energy transfers in a forced homogeneous turbulence experiment under rotation

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We investigate the interplay between the cyclone-anticyclone asymmetry and the anisotropic energy transfers in a statistically
stationary, homogeneous and axisymmetric turbulence experiment in a rotating frame. Turbulence is forced by a new setup made of 10
vortex dipole generators arranged in arena in a large water tank mounted on a rotating platform. Energy transfers are characterized by
the energy flux density F(r), computed from velocity increments u over separation vector r measured by corotating
particle image velocimetry. Interestingly, because of the cyclone-anticyclone asymmetry present at Rossby number of order 1, the
mirror symmetry with respect to any vertical plane is broken, resulting in a nearly azimuthal energy flux density F(r). The influence
of this additional degree of freedom on the dynamics of the energy transfers is discussed.

Author(s):

Antoine Campagne    
Laboratoire FAST, CNRS, Université Paris-Sud, UPMC
France

Basile Gallet    
Laboratoire FAST, CNRS, Université Paris-Sud, UPMC
France

Paul Billant    
LadHyX, CNRS, Ecole Polytechnique, Palaiseau
France

Frédéric Moisy    
Laboratoire FAST, CNRS, Université Paris-Sud, UPMC
France

Pierre-Philippe Cortet    
Laboratoire FAST, CNRS, Université Paris-Sud, UPMC
France