Soliton Turbulence in Approximate and Exact Models for Deep Water Waves

Dmitry Kachulin, Alexander Dyachenko, Vladimir Zakharov

Research output: Contribution to journalArticle

Abstract

We investigate and compare soliton turbulence appearing as a result of modulational instability of the homogeneous wave train in three nonlinear models for surface gravity waves: the nonlinear Schrödinger equation, the super compact Zakharov equation, and the fully nonlinear equations written in conformal variables. We show that even at a low level of energy and average wave steepness, the wave dynamics in the nonlinear Schrödinger equation fundamentally differ from the dynamics in more accurate models. We study energy losses of wind waves due to their breaking for large values of total energy in the super compact Zakharov equation and in the exact equations and show that in both models, the wave system loses 50% of energy very slowly, during few days.

Original languageEnglish (US)
Article number67
JournalFluids
Volume5
Issue number2
DOIs
StatePublished - Jun 2020

Keywords

  • Dyachenko equations
  • freak waves
  • nonlinear Schrödinger equation
  • nonlinear waves
  • super compact Zakharov equation
  • surface gravity waves
  • wave breaking

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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