Journal
EUROPHYSICS LETTERS
Volume 53, Issue 2, Pages 209-215Publisher
EDP SCIENCES S A
DOI: 10.1209/epl/i2001-00138-7
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Wave resistance is the drag force associated to the emission of waves by a moving disturbance at a free fluid surface. In the case of capillary-gravity waves it undergoes a transition from aero to a finite value as the speed of the disturbance reaches a certain critical value. For the first time an experiment is designed in order to obtain the capillary-gravity wave resistance as a function of speed. The effect of viscosity is explored, and a magnetic fluid is used to extend the available range of critical speeds. The threshold values are in good agreement with the proposed theory. Contrary to the theoretical model, however; the measured wave resistance reveals a non-monotonic speed dependence after the threshold.
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