Some behaviours of coherent structures under controlled excitation in coaxial jet of mean velocity ratio of 0.3

Based on conditional sampling technique, isocontours of the recovered fluctuating vorticity within the initial region of coaxial jet of mean velocity ratio λ-1 = Ui/Uo = 0.3 under acoustic excitation at a Strouhal number of 0.84 show the presence of inner and outer vortices. The dynamics of these coherent structures depend highly on the applied excitation level.link_to_subscribed_fulltex