Inverse cascade in Charney-Hasegawa-Mima turbulence

Details Inverse cascade in Charney-Hasegawa-Mima turbulence Inverse cascade in Charney-Hasegawa-Mima turbulence

2002-03-21

arxiv.org/abs/nlin/0203044v1

Nonlinear Sciences

Chaotic Dynamics

4 pages, 5 figures

Scientific paper

10.1209/epl/i2002-00180-y

The inverse energy cascade in Charney-Hasegawa-Mima turbulence is investigated. Kolmogorov law for the third order velocity structure function is shown to be independent on the Rossby number, at variance with the energy spectrum, as shown by high resolution direct numerical simulations. In the asymptotic limit of strong rotation, coherent vortices are observed to form at a dynamical scale which slowly grows with time. These vortices form an almost quenched pattern and induce strong deviation form Gaussianity in the velocity field.

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