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Figure 6


Fig. 6. Contours of {lambda}2-value and vorticity for the flow field shown in Fig. 5C. (A) {lambda}2-value contour; the locations designated Vx1, Vx2, Vx3 and Vx4 are cores of vortices adjacent to caudal fin-wave propagation (CFP) jets. (B) Vorticity contour; bold black arrows indicate the dorsal and ventral CFP jets located between counter-rotating vortex pairs. The white, curved bold arrows indicate the directions of rotation of four vortices adjacent to the dorsal and ventral CFP jets. The bold white curves (A,B) indicate the projection of the trailing edge of the caudal fin on the plane of the light sheet. The black vectors (A,B) indicate the in-plane flow velocities.