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Numerical investigation of the instability and nonlinear evolution of narrow-band directional ocean waves
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.
2010 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 105, no 1, 014501- p.Article in journal (Refereed) Published
Abstract [en]

The instability and nonlinear evolution of directional ocean waves is investigated numerically by means of simulations of the governing kinetic equation for narrow-band surface waves. Our simulation results reveal the onset of the modulational instability for long-crested wave trains, which agrees well with recent large-scale experiments in wave basins, where it was found that narrower directional spectra lead to self-focusing of ocean waves and an enhanced probability of extreme events. We find that the modulational instability is nonlinearly saturated by a broadening of the wave spectrum, which leads to the stabilization of the water-wave system. Applications of our results to other fields of physics, such as nonlinear optics and plasma physics, are discussed.

Place, publisher, year, edition, pages
New York: The American Physical Society , 2010. Vol. 105, no 1, 014501- p.
Research subject
Physics
Identifiers
URN: urn:nbn:se:umu:diva-38747DOI: 10.1103/PhysRevLett.105.014501ISI: 000279392400001OAI: oai:DiVA.org:umu-38747DiVA: diva2:381405
Available from: 2010-12-27 Created: 2010-12-27 Last updated: 2017-12-11Bibliographically approved

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Eliasson, BengtShukla, Padma Kant
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