Figure 9: Image (a) displays a colormap derived from the PIV data, depicting the y-component (vertical direction) of the fluid velocities within the ring vortex. (b) shows the structure of the ring (vertical crosssection) captured by the B-scan mode of a Doppler scanner. The color Doppler image (c) clarifies flow toward/away from the probe (placed at the top of the image) and apart from the persistence artefact, appropriately resembles the PIV data of image (a).
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