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MHD turbulence at high interaction parameter

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Saturation mechanisms in solar and planetary dynamos are due to the feedback of the Lorentz force on conducting fluid
flows. The way a magnetic field modify a laminar flow have been explored both analytically and experimentally. But the detailed scale
by scale of the modification of a fully turbulent flow is still an open question. We study here both magnetic and velocity fields in a
turbulent Von Karman gallium flow with a large external applied magnetic field. First we will show that turbulent induction processes
are strongly affected by the presence of a large magnetic field, then we will focus on hydrodynamics measurement (torques and velocity
profiles by ultrasound Doppler velocimetry) which highlight the damping of large scale of the flow whereas the statistics of turbulent
fluctuations remain unmodified.

Author(s):

Sophie MIRALLES    
Ecole Normale Supérieure de Lyon
France

Gautier VERHILLE    
Institut de Recherche sur les Phénomènes Hors Equilibre
France

Nicolas PLIHON    
Ecole Normale Supérieure de Lyon
France

Jean-Francois PINTON    
Ecole Normale Supérieure de Lyon
France