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If you have a question about this talk, please contact Dr Kalin Dragnevski.
It is generally believed that in order to generate waves, a small object (like an insect) moving at the air-water surface must exceed the minimum capillary-gravity wave speed (about 23 centimeters per second). We have shown recently that this result is only valid for a rectilinear uniform motion, an assumption often overlooked in the literature. In the case of a steady circular motion (a situation of particular importance for the study of whirligig beetles), we demonstrate that no such velocity threshold exists and that 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. It would be very interesting to know if whirligig beetles can take advantage of such spirals for echolocation purposes.
This talk is part of the BSS Formal Seminars series.
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Other listsVeritas Forum Cambridge Engineering Department Energy, Fluids and Thermo seminars Sir David King's Surface Science Seminars
Other talksLithops and other mesembs. Object handling session Bad Moves: How decision making goes wrong and the ethics of smart drugs’ Hydrodynamic description of thin nematic films Geometric Mechanics & Symmetry: From Finite to Infinite Dimensions short course - day 1 Intimacy and Knowledge