Air water interaction phenomena during the breaking of modulated wave trains (Abstract/Poster in convegno)

Type
Label
  • Air water interaction phenomena during the breaking of modulated wave trains (Abstract/Poster in convegno) (literal)
Anno
  • 2012-01-01T00:00:00+01:00 (literal)
Alternative label
  • Iafrati A., Babanin A., Onorato M. (2012)
    Air water interaction phenomena during the breaking of modulated wave trains
    in First International Conference on Frontiers in Computational Physics: Modeling the Earth System, Boulder (CO), 16-20 December 2012
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Iafrati A., Babanin A., Onorato M. (literal)
Note
  • Abstract (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • CNR-INSEAN, Swinburne University of Technology, Dipartimento di Fisica Generale, Università di Torino - Torino (literal)
Titolo
  • Air water interaction phenomena during the breaking of modulated wave trains (literal)
Abstract
  • The air water interaction taking place during the breaking of ocean waves is investigated. This has strong connection with the interaction between the lower atmosphere and the upper ocean layer and thus contributes to the exchange processes of heat, gas and chemicals. In some circumstances it influences weather conditions on large scales. This is the case of hurricanes in which, due to the high wind speed, the wave breaking occurrence and the formation of sprays, causes a reduction of the drag coefficient at the ocean surface. The study is done numerically by a two-dimensional Navier-Stokes solver which models the flow in air and water as that of a single incompressible fluid with density and viscosity expressed as a smooth function of the distance from the interface. The free surface is captured as the zero level set of the distance function. The distance from the interface is reinitialized every time step in order to keep constant the thickness of the transition region. The method is used to simulate the wave breaking occurrence in modulated wave trains, with a fundamental wave component 60 cm wavelength. Depending on the initial amplitude, rather steep waves are generated, which may eventually break. The formation of steep wave front and the successive breaking event are rather fast and cause the separation of the air flow from the crest, with a corresponding generation of intense vorticity structures in air. The interaction of these vortex structures with the air-water interface leads to the formation of a train of dipoles which propagate upwards at an high comparable to the wavelength. The formation of the dipoles and the vortex structures formed in the air are shown in the figure below. (literal)
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