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Diagram of the experimental design. The soap film flows from left to right. The filament is placed in the wake of the cylinder with its leading edge attached to a cocoon silk fiber. The other end of the fiber is connected to a cantilever beam. A micro mirror is stuck on the end of the beam to reflect laser. The laser spot on the screen corresponds to the force imposed on the cantilever beam.
Experimental results. The left column shows the experimental photos. The middle column depicts the motions of the filament. The dot line represents the position where the supporting silk fiber is tight. The right column shows phase plots of the cross-stream tail displacement against the cross-stream tail velocity . The values are normalized by the flow speed and the cylinder diameter . The flow speed is 0.95 m/s. The diameter of the cylinder is 11 mm and the length of the threads is 20 mm. (a)–(c) are P mode, S mode, and R mode, respectively.
Force measurement results. (a)–(c) are P mode, S mode, and R mode, respectively.
Streamwise velocity of a cylinder along the centerline . The upper image is an experimental photo of a single cylinder in a flowing soap film. The bottom plot is the velocity distribution along centerline. The solid and dashed lines are average velocity and maximum/minimum velocity boundaries, respectively. The dot line represents the scaled wave speed . and are the intersection points between the scaled wave speed and the velocity boundaries. SZ stands for the suction zone, P the propulsion mode, R the rock mode, and S the swing mode.
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