V. Herbert et al., IDENTIFICATION OF ORGANIZED STRUCTURES IN 2-DIMENSIONAL TURBULENCE, Comptes rendus de l'Academie des sciences. Serie II. Mecanique, physique, chimie, astronomie, 323(8), 1996, pp. 519-526
We propose and study a new criterion based on the vorticity field prop
erties, in order to define and characterize more precisely vortices (o
rganized structures) in two-dimensional incompressible flows. This cri
terion is compared with the Weiss criterion. Analytical derivations an
d numerical studies bring more insight into dissipation processes and
axisymmetrixation of elliptical vortex structures.