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Fig. 7. Drift and fluid body volume measurements for translating vortices. Colored
solid lines: drift volume of planes initially located in 0.3 cm increments
from 2.7 cm (red) to 8.0 cm (blue) downstream of the vortex generator exit.
Total fluid drift (i.e. for infinite domain) was computed using measured
partial drift in the measurement window and an analytical asymptotic
correction factor (i.e. Eq. 12; Eames et
al., 1994). Closed circles: measured volume of ellipsoidal fluid
vortex. Error bars indicate measurement uncertainty. Broken blue line:
least-squares linear fit to vortex volume measurements. Solid red line: linear
fit required to exactly match the added-mass coefficient of an equivalent
solid body. Inviscid sphere solution is plotted for comparison (black
line).
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