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Fig. 3. Velocity magnitude (A,C,E) and vorticity contour plots (B,D,F) during three separate, consecutive jets of an adult L. pealei holding position at 25 cm s-1. Flume flow is from left to right. The aft section of the squid is shown in white in the velocity magnitude plots and in black in the corresponding vorticity contour plots. The elongated region of fast moving fluid is the jet. The magnitudes of vorticity contours are (B) 4, 6, 10, 15 and 20 rad s-1, (D) 2, 4, 6, 10, 15 and 20 rad s-1, and (F) 3, 4, 6, 10, 15 and 20 rad s-1. See explanation of contour identification in Fig. 2. These are not consecutive image pair visualizations; rather each set of plots represents the flow at some instant during the jet period of three consecutive jets. (A,B) t=0.3 s, t/{Delta}tj=1.0, (C,D) t=0.7 s, t/{Delta}tj=1.2, and (E,F) t=0.5 s, t/{Delta}tj=0.9.





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