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Collision of two breathers at surface of deep water

We applied canonical transformation to water wave equation not only to remove cubic nonlinear terms but to simplify drastically fourth order terms in Hamiltonian. This transformation explicitly uses the fact of vanishing exact four waves interaction for water gravity waves for 2D potential fluid. After the transformation well-known but cumbersome Zakharov equation is drastically simplified and can be written in X-space in compact way. This new equation is very suitable as for analytic study as for numerical simulation. Localized in space breather-type solution was found. Numerical simulation of collision of two such breathers strongly supports hypothesis of integrability of 2-D free surface hydrodynamics.

preprint2012arXivOpen access
A. I. DyachenkoV. E. ZakharovD. I. Kachulin
physics.flu-dyn
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A. I. DyachenkoV. E. ZakharovD. I. Kachulin

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