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A great many studies have been
directed towards understanding the flow over wings and, in particular, over a delta wing.
Very surprisingly indeed, in our view, there exist no visualizations, from the laboratory,
of the far-field development of the trailing vortex pair as it travels downstream, to
our knowledge. Our flow visualization, involving novel free-flight gliding of a delta
wing in water, shows for the first time, the exquisitely beautiful structure of the
turbulent wake, in plan view. The fluorescence dye,
illuminated by a laser, shows that the near wake comprises an interaction between the
primary streamwise vortex pair with the "braid" wake vortices between the pair.
This work is supported by the Office of Naval Research.
Extract from the Gallery of Fluid Motion, Physics of Fluids, Vol. 7, No. 9, September
1995. Contributed by G. D. Miller and C. H. K. Williamson (Cornell University).
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