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Figure 10


Fig. 10. Digital particle image velocimetry (DPIV) results for the robotic ribbon fin at three different time instances. The ribbon fin is shown in translucent gray. The colormap indicates the x-velocity normalized by the wave speed V. In this case V=0.5 m s–1. (A) DPIV image and computed flow field at t=2.67 s (after four complete wave cycles). (B1), (B2) and (B3) flow field for the robotic ribbon fin at t=2.67, 2.80 and 3.00 s, respectively, equivalent to 0, 20 and 50% of one wave cycle. Velocity values at and above 50% of the wave speed are mapped to red to highlight the streamwise jet, which includes velocities as high as 90% of the wave speed.





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