Phase randomization of three-wave interactions in capillary waves

Details Phase randomization of three-wave interactions in capillary waves Phase randomization of three-wave interactions in capillary waves

2009-07-19

arxiv.org/abs/0907.3325v1

Physical Review Letters, 103, 064502, 2009

Physics

Fluid Dynamics

4 pages, 5 figures, accepted 17July09 for publication in PRL

Scientific paper

10.1103/PhysRevLett.103.064502

We present new experimental results on the transition from the coherent-phase to the random-phase three-wave interactions in capillary waves under parametric excitation. Above the excitation threshold, coherent wave harmonics spectrally broaden. An increase in the pumping amplitude increases spectral widths of wave harmonics and eventually causes a strong decrease in the degree of the three-wave phase coupling. The results point to the modulation instability of capillary waves, which leads to breaking of continuous waves into ensembles of short-lived wavelets or envelope solitons, as the reason for the phase randomization of three-wave interactions.

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