Experiments on the dynamics and stability of vortex pairs with axial core flow at high Reynolds numbers

Introduction – This presentation shows experimental results concerning the dynamics of two par-allel (or nearly parallel) vortices at high Reynolds numbers (Re), which are characterised by the presence of an axial velocity defect. Co- and counter-rotating vortex pairs are studied in a wind tunnel and a water channel, with the goal of identifying and characterising a short-wave elliptic instability, which is expected to occur in this flow. In addition to the fundamental interest of thi