Vortex dynamics in a spatially accelerating shear layer

摘要: An experimental and analytical study into the vortex dynamics of a stratified shear layer subjected to spatial acceleration is presented. The outer flow dictated by hydraulically controlled wedge which provides spatially accelerating baroclinic generation vorticity along inclined interface. A new, finite-amplitude mechanism observed in core growing separated from source at secondary develops an altered pairing interaction observed. linear stability analysis reveals that one two modified Kelvin-Helmholtz modes dominant, resulting centre instability being offset density interface slower moving stream. Digital particle imaging velocimetry (DPIV) measurements are presented with visualization indicate result combined effects buoyancy. mixing induced interfacial instabilities such sharp remains near high-momentum stream, low-gradient region extending low-momentum