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Fig. 6. Vortex ring structure and x-velocity around the ribbon fin. (A)
Top view, and (B) front end view of isosurface of vorticity magnitude 30
s–1, colored by the x-velocity normalized by the
wave speed V (in this case V=10 cm s–1).
The primary and secondary vortex rings are indicated in A (see
Fig. 14A for a schematic of
the primary vortex rings). (C) Bottom view, spatial correlation between an
isosurface of the same vorticity magnitude as in A (yellow) and an isosurface
of x-velocity at 2 cm s–1 (blue). Primary vortex
rings are seen to connect across the fin surface. These results are for
t=1.0 s and the baseline case: 
max=30 deg.,
f=2 Hz, 
/Lfin=0.5,
hfin/Lfin=0.1. Movies 1 and 2
(supplementary material) show the evolution of the streamwise jet from
perspective and bottom views, respectively, for the baseline case.
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