Global modes in a swirling jet undergoing vortex breakdown
We consider experimental data of a turbulent swirling jet undergoing vortex breakdown. The
jet is discharged from a round nozzle into steady ambient fluid. The dynamics of the flow are
dominated by large scale oscillations that arise from a super-critical Hopf bifurcation to a
global mode. Visualizations on top of the page are based on the three-dimensional phase-
averaged velocity field (Re= 20 000) that is constructed from uncorrelated 2D PIV snapshots.
1 The focus is placed on three flow features: the internal recirculation zone that is …
jet is discharged from a round nozzle into steady ambient fluid. The dynamics of the flow are
dominated by large scale oscillations that arise from a super-critical Hopf bifurcation to a
global mode. Visualizations on top of the page are based on the three-dimensional phase-
averaged velocity field (Re= 20 000) that is constructed from uncorrelated 2D PIV snapshots.
1 The focus is placed on three flow features: the internal recirculation zone that is …