TY - GEN
T1 - Three dimensional velocity field underneath a breaking rogue wave
AU - Alberello, Alberto
AU - Pakodzi, Csaba
AU - Nelli, Filippo
AU - Bitner-Gregersen, Elzbieta M.
AU - Toffoli, Alessandro
N1 - 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.
PY - 2017
Y1 - 2017
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85032860816&partnerID=8YFLogxK
U2 - 10.1115/OMAE201761237
DO - 10.1115/OMAE201761237
M3 - Conference contribution
AN - SCOPUS:85032860816
T3 - Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE
BT - Structures, Safety and Reliability
PB - American Society of Mechanical Engineers (ASME)
T2 - ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering
Y2 - 25 June 2017 through 30 June 2017
ER -
