Fig. 3.
The body dynamics for a more slender body and for a lighter body. (A) The trajectory of a body with the same mass as in Fig. 1, with the same start-up condition and Refr, but which is more slender (aspect ratio 10:1). The wake consists of paired vortices at an oblique angle. (B) The horizontal pressure (blue line) and viscous (red line) forces acting on the body as a function of time. The dashed line marks the instant of A. The horizontal velocity, ub(t) (black line), shows a more gradual ramp-up than in Fig. 1. The input power P(t) (green line) again drops when steady locomotion is achieved. (C) The trajectory of a body with the same aspect ratio as in Fig. 1, but lighter (ρb/ρ = 1), at the same Refr and with the same start-up condition.