Volume 95, Number 3, August 2011
|Number of page(s)||6|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||07 July 2011|
A flux loop mechanism in two-dimensional stratified turbulence
Dipartimento di Fisica Generale and INFN, Università di Torino - via P.Giuria 1, 10125 Torino, Italy, EU
2 Dipartimento di Fisica and INFN, Università di Genova - via Dodecaneso 33, 16146 Genova, Italy, EU
3 CNRS, Laboratoire J.A. Dieudonné UMR 6621 - Parc Valrose, 06108 Nice, France, EU
4 International Collaboration on Turbulence Research
Accepted: 10 June 2011
We discuss the phenomenology of energy transfer in two-dimensional, weakly stably stratified turbulence. Kinetic energy, mechanically injected at small scales, is transferred by turbulence towards large scales. This inverse cascade proceeds up to the Ozmidov scale, where buoyancy forces become effective. Kinetic energy is converted into potential energy, which is transferred back towards small scales via a turbulent cascade of density fluctuations. The resulting “flux loop” is a novel mechanism which produces a non-trivial stationary state in two-dimensional turbulence in the absence of a large-scale dissipation.
PACS: 47.27.E- – Turbulence simulation and modeling / 47.55.Hd – Stratified flows
© EPLA, 2011
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