Journal
JOURNAL OF FLUID MECHANICS
Volume 656, Issue -, Pages 448-457Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0022112010002703
Keywords
rotating turbulence; turbulence simulation; turbulence theory
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Funding
- Knut and Alice Wallenberg Foundation
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High-resolution simulations of forced quasi-geostrophic (QG) turbulence reveal that Charney isotropy develops under a wide range of conditions, and constitutes a preferred state also in beta-plane and freely decaying turbulence. There is a clear analogy between two-dimensional and QG turbulence, with a direct enstrophy cascade that is governed by the prediction of Kraichnan (J. Fluid Mech., vol. 47, 1971, p. 525) and an inverse energy cascade following the classic k(-5/3) scaling. Furthermore, we find that Charney's prediction of equipartition between the potential and kinetic energy in each of the two horizontal velocity components is approximately fulfilled in the inertial ranges.
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