Fig. 4
From: Flutter to tumble transition of buoyant spheres triggered by rotational inertia changes
Free-rise experiments of buoyant spheres. a Trajectories and wakes of high (left) and low (right) MoI spheres at Ga ≈ 6000. b Trajectories and wakes of high (left) and low (right) MoI spheres at Ga ≈ 500. In a, b, the wakes were visualized by releasing a fluorescent dye. False coloring was adopted based on the intensity of the dye in the wake. Note that the diameter scale ‘D’ is shown in each case. Reducing the MoI or allowing rotation at fixed Γ triggers an increase in the oscillation amplitude along with a change in the wake pattern. Supplementary Movies 4 and 5 correspond to the cases shown in a, b, respectively
