On capillary-gravity waves generated by a slow moving object

Details On capillary-gravity waves generated by a slow moving object On capillary-gravity waves generated by a slow moving object

2007-04-30

arxiv.org/abs/0704.3990v2

Physics

Classical Physics

Scientific paper

10.1103/PhysRevLett.100.074504

We investigate theoretically and experimentally the capillary-gravity waves created by a small object moving steadily at the water-air interface along a circular trajectory. It is well established that, for straight uniform motion, no steady waves appear at velocities below the minimum phase velocity $c_{min} = 23 \rm{cm \cdot s}^{-1}$. We show theoretically that no such velocity threshold exists for a steady circular motion, for which, even at small velocities, a finite wave drag is experienced by the object. This wave drag originates from the emission of a spiral-like wave pattern. Our results are in good agreement with direct experimental observations of the wave pattern created by a circularly moving needle in contact with water. Our study leads to new insights into the problem of animal locomotion at the water-air interface.

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