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Reconnection of counter-rotating vortices. Two initially almost rectilinear counter-rotating vortices usually reconnect one to the other, and form two loops on each side of the reconnection region. This phenomenon can be observed in the sky in the wake of airliners. More generally, it is a generic process of fluid motion. Vortex reconnection can be investigated through numerical simulations. The two vortices are locally compressed one towards the other, they become smaller (they can be seen in…

Un jet tourbillonnaire à faible rotation (swirl ~ 0.4) peut se diviser en éjectant des paires de vortex contra-rotatifs hélicoïdales, ici en vert, au nombre de 3. La surface semi-transparente du plan supérieur est colorée par l'intensité de la vitesse. Simulation numérique effectuée sur le supercalculateur NEC SX5 de l'IDRIS-CNRS.