Three dimensional velocity field underneath a breaking rogue wave

Alberello, Alberto ORCID:, Pakodzi, Csaba, Nelli, Filippo, Bitner-Gregersen, Elzbieta M. and Toffoli, Alessandro (2017) Three dimensional velocity field underneath a breaking rogue wave. In: Structures, Safety and Reliability. Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE . American Society of Mechanical Engineers (ASME), NOR. ISBN 9780791857656

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Wave breaking has large impact on stresses and loading on marine structures, but it is not yet accounted for in the design process. A numerical investigation is here presented to fully assess the three-dimensional velocity field underneath a breaking wave. The breaking onset is achieved by modulating an initial monochromatic wave with infinitesimal sideband perturbations. The latter triggers a nonlinear energy transfer, which allows one individual waves to grow and break once the steepness has overcome a specific threshold. Numerical simulations of the Navier-Stokes equations are carried out by means of the open source CFD code OpenFOAM. To speed up the simulation process, the nonlinear evolution of the perturbed Stokes wave is first obtained with a High-Order Spectral Method (HOSM) until the onset of breaking; surface elevation and velocity field are then transferred to the CFD for the final stage of the breaking process. The fully three-dimensional turbulent kinematic field is presented and discussed with reference to the velocity field predicted by the theory.

Item Type: Book Section
Additional Information: Funding Information: A.A. and F.N. are supported by the Swinburne University of Technology Postgraduate Research Award (SUPRA). This work was performed on the gSTAR national facility at Swinburne University of Technology. gSTAR is funded by Swinburne and the Australian Governments Education Investment Fund. Publisher Copyright: © Copyright 2017 ASME.
Uncontrolled Keywords: ocean engineering,energy engineering and power technology,mechanical engineering,sdg 14 - life below water ,/dk/atira/pure/subjectarea/asjc/2200/2212
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Depositing User: LivePure Connector
Date Deposited: 04 Dec 2021 01:46
Last Modified: 22 Oct 2022 23:55
DOI: 10.1115/OMAE201761237

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