Physics – Atmospheric and Oceanic Physics
Scientific paper
2011-07-07
Physics
Atmospheric and Oceanic Physics
18 pages, in Russian, 21 figures, more numerical results included
Scientific paper
Recent results of numerical simulations of fully nonlinear evolutionary equations for long-crested deep-water waves are discussed, where formation of extreme waves was observed. Several examples demonstrate that three-dimensionality of the fluid motion has an essential influence on the process of rogue wave formation. In particular, in the presence of elongate wave groups, the most tall extreme waves occur when in an initial state the wave fronts were oriented obliquely to the direction of the group. An "optimal" angle, resulting in the highest rogue waves, depends on initial wave amplitude and group width, and it is about 18-28 degrees in a practically important range of parameters. Besides that, the mechanism of spatial-temporal focusing on a random wave background has been simulated for several values of nonlinearity.
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