Experimental and numerical study of vortex couples in two-dimensional flows
Y. Couder a1andC. Basdevant a2 a1 Groupe de Physique des Solides, Ecole Normale Supérieure, 24, rue Lhomond, 75231 Paris Cedex 05, France a2 Laboratoire de Météorologie Dynamique, Ecole Normale Supérieure, 24, rue Lhomond, 75231 Paris Cedex 05, France
Two-dimensional turbulence is investigated experimentally in thin liquid films. This study shows the spontaneous formation of couples of opposite-sign vortices in von Kármán wakes. The structure of these couples, their behaviour and their role in turbulent flows is then studied using both a numerical simulation and laboratory results.
(Published Online April 21 2006) (Received March 26 1986)