Time-Resolved Particle Image Velocimetry (TR-PIV) data was acquired in the wake of Ahmed bodies allowing the effects of varying the aspect ratio on the wake dynamics to be revealed. The spatial structures and energy contained in the dominant wake modes within the frequency spectra were investigated. It was found that a dominant frequency existed in the near wake of all aspect ratio bodies and that this frequency appeared not to be influenced by aspect ratio. This frequency was related to an alternate vertical flapping motion of the C-pillar vortices. The influence of aspect ratio on the corner vortex strength was identified. The formation of a vortex below the C-pillar vortex that appeared dependent on the interaction between the upwash and downwash was also noted.
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Publication title
Proceedings of the 19th Australasian Fluid Mechanics Conference