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).