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Fig. 4. Vorticity contour fields around the posterior edge of the carapace of the
spotted boxfish (upper row), scrawled cowfish (middle row), and buffalo
trunkfish (bottom row) models positioned (from left to right) at pitch angles
of +20°, +10°, 0°, -10°, and -20°, and a yaw angle of
10°. The data are viewed in transverse planes, and sampling locations are
highlighted in the upper corner of figures. Each plot is the mean result of 30
image pairs (1 representative trial). The shadows underneath or to the side of
models represent areas that were shielded from laser light. White dots in
scrawled cowfish and buffalo trunkfish figures are the tips of the ventral
keels extensions. Mean circulation magnitude and mean peak vorticity magnitude
for a dorsal vortex (
D, and P
D,
respectively) and a ventral vortex (V and
PV, respectively are included beneath the vorticity
contour plots. For the yaw angles, circulation and peak vorticity values for
each side of the carapace are included (right side, in normal text =
far-field; left side, in italicized text = near-field).
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