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The Velocity Field Underneath a Breaking Rogue Wave: Laboratory Experiments Versus Numerical Simulations

1
School of Mathematical Sciences, The University of Adelaide, Adelaide, SA 5005, Australia
2
Department of Infrastructure Engineering, The University of Melbourne, Parkville, VIC 3010, Australia
3
CNR-INM, Institute of Marine Engineering, 00128 Rome, Italy
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Fluids 2019, 4(2), 68; https://doi.org/10.3390/fluids4020068
Received: 22 February 2019 / Revised: 2 April 2019 / Accepted: 6 April 2019 / Published: 11 April 2019
(This article belongs to the Special Issue Nonlinear Wave Hydrodynamics)
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Abstract

Wave breaking is the most characteristic feature of the ocean surface. Physical investigations (in the field and at laboratory scale) and numerical simulations have studied the driving mechanisms that lead to wave breaking and its effects on hydrodynamic loads on marine structures. Despite computational advances, accurate numerical simulations of the complex breaking process remain challenging. Validation of numerical codes is routinely performed against experimental observations of the surface elevation. However, it is still uncertain whether simulations can accurately reproduce the velocity field under breaking waves due to the lack of ad-hoc measurements. In the present work, the velocity field recorded with a Particle Image Velocimetry method during experiments conducted in a unidirectional wave tank is directly compared to the results of a corresponding numerical simulation performed with a Navier–Stokes (NS) solver. It is found that simulations underpredict the velocity close to the wave crest compared to measurements. Higher resolutions seem necessary in order to capture the most relevant details of the flow. View Full-Text
Keywords: waves; water waves; wave breaking; Navier–Stokes; CFD; particle image velocimetry waves; water waves; wave breaking; Navier–Stokes; CFD; particle image velocimetry
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Alberello, A.; Iafrati, A. The Velocity Field Underneath a Breaking Rogue Wave: Laboratory Experiments Versus Numerical Simulations. Fluids 2019, 4, 68.

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