Volume 78, Number 3, May 2007
|Number of page(s)||6|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||27 April 2007|
The structures responsible for the inverse energy and the forward enstrophy cascades in two-dimensional turbulence
MAB, Université Bordeaux 1, CNRS UMR 5466, INRIA projet MC2 - 351 cours de la Libération, 33405 Talence, France
2 CPMOH, Université Bordeaux 1, CNRS UMR 5798 - 351 cours de la Libération, 33405 Talence, France
Accepted: 27 March 2007
Two-dimensional turbulence admits two different ranges: an inverse energy cascade at large scales and a cascade of enstrophy to the small scales. Here we show that two flow structures govern the transfers of either enstrophy or energy. Vortical structures are responsible for the transfers of energy upscale while filamentary structures are responsible for the forward transfer of the enstrophy.
PACS: 47.27.Ak – Fundamentals / 47.27.Gs – Isotropic turbulence; homogeneous turbulence
© Europhysics Letters Association, 2007
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