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Fig. 5. Dorsal and anal fin vorticity and vector plots during steady swimming at
0.5 L s-1. Top panel shows the dorsal fin with formation
of trailing vortices during fin oscillation. Flow between the vortex centers
shows jets to either side of the fish during a complete tail beat cycle.
Bottom panel is the ventral view showing the anal fin producing shear flow on
either side of the fin during the stroke. These shearing regions roll up and
form elongated vortex cores. Both images reveal that shear build up along the
side of fins develops long before the vortex is actually shed from the fin.
Vectors have been removed from the image where they were disrupted by the
shadow of the fish. Note that x and y axes represent the
scale of the video image.
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