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| The existence of slow scales in turbulence has an important effect in meteorology and in the geodynamo problem. In this work we will present the results of an experimental setup where these scales are investigated. Two different dynamics are observed: a multistability and random switching between different solutions of the average flow, and inverse cascades in the fully developed 3D experimental turbulent flow. In this last case we propose that the conserved magnitude is the angular momentum. The experimentl setup consists on a fluid in a closed cavity where two inhomogeneous and strongly turbulent flows collide in a thin region. The experimental volume is a closed cylinder (diameter of 20cm) where two impellers rotate in opposite directions. |
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