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Onset of Wave Drag Due to Generation of Capillary-Gravity Waves by a Moving Object as a Critical Phenomenon

Domenii publicaţii > Fizica + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: T. Burghelea, V. Steinberg

Editorial: American Physical Society, Physical Review Letters, 86, p.2557, 2001.


The onset of the {em wave resistance}, via generation of capillary gravity waves, of a small object moving with velocity $V$, is investigated experimentally. Due to the existence of a minimum phase velocity $V_c$ for surface waves, the problem is similar to the generation of rotons in superfluid helium near their minimum. In both cases waves or rotons are produced at $V>V_c$ due to {em Cherenkov radiation}. We find that the transition to the wave drag state is continuous: in the vicinity of the bifurcation the wave resistance force is proportional to $sqrt{V-V_c}$ for various fluids.

Cuvinte cheie: wave drag, bifurcation