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| Titel |
Simulations of the Peregrine Breather with a Multi-Layer Non-Hydrostatic Model |
| VerfasserIn |
Alberto Alberello, Thomas Vyzikas, Amin Chabchoub, Alessandro Toffoli |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250140707
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| Publikation (Nr.) |
 EGU/EGU2017-4134.pdf |
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| Zusammenfassung |
| In ocean engineering, wave focusing techniques are routinely adopted to deterministically
reproduce rogue waves in numerical and physical wave experiments. The nonlinear
Schrödinger Equation (NLSE), that accounts for the nonlinear dynamical evolution of a wave
envelope, accurately describes the physical mechanism leading to the formation of rogue
waves in the ocean. Here, we use the Peregrine breather solution of the NLSE to
generate a doubly-localised rogue wave, i.e. one single extreme event at a specific time
and position. A comparison is performed to validate numerical simulations with
physical experiments. The physical experiments have been conducted in the Extreme
Air-Sea Interaction (EASI) facility at The University of Melbourne, while numerical
simulations have been performed in a nonlinear multi-layer numerical wave tank (NWT),
designed using the non-hydrostatic model SWASH. We discuss the performance of
SWASH with respect to number of layers, initial boundary conditions, time-stepping
technique and numerical propagation schemes via a thorough convergence study.
We show that the propagation of steep non-breaking wave in a high-resolution
NWT in SWASH is in good agreement with the surface elevation, measured in
the physical experiments. Satisfactory agreement is achieved for computational
time, that is considerably lower than the one required by traditional Navier-Stokes
simulations. This opens the possibility to investigate the propagation of extreme waves
over complicated bathymetries as well as their interaction with marine structures |
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