Volume 36, Number 5, November II 1996
|Page(s)||367 - 372|
|Section||Classical areas of phenomenology|
|Published online||01 September 2002|
Vorticity selection in large-scale two-dimensional flow
Dipartimento di Fisica, Università di Roma II "Tor
Vergata”, Via della Ricerca Scientifica 1, 00133 Rome, Italy
2 Scripps Institute of Oceanography, University of California, San Diego, La Jolla, CA 92093, USA
3 CNRS, Observatoire de Nice - B.P. 229, 06304 Nice Cedex 4, France
Accepted: 26 September 1996
The large-scale dynamics of a two-dimensional incompressible Navier-Stokes flow maintained by a small-scale chiral forcing is analyzed by direct numerical simulations. It is shown that the breaking of mirror symmetry due to the forcing on the small scales produces a strong vorticity selection on the large scales. Vortices are depleted or enhanced depending on their sense of rotation.
PACS: 47.20.-k – Hydrodynamic stability / 47.27.Qb – Turbulent diffusion
© EDP Sciences, 1996
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