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This work is focused on the assessment of greenwater overtopping onto fixed ship-shaped FPSO models using three dimensional (3-D) Computational Fluid Dynamics (CFD) simulations. Good agreement between the numerical results and published experimental data from Barcellona et al. (2003) indicates that 3-D CFD is an effective tool which may be used to assess greenwater associated with an incident wave group. Different wall-sided bow shapes are investigated numerically, and the results provide insight into how the bow shape influences the evolution of on-deck flows, and the horizontal force on a vertical wall spanning the full deck width for incident waves approaching normal to the bow. It is found that the horizontal force, thus, the horizontal momentum of greenwater flows, is a result of the combined action of water-front velocities and the corresponding water volume impacting on the structures. For the bow shapes considered in this study, although clear differences in on-deck flow are observed for different bow shape, differences in force on the vertical wall are relatively small. Simulations for a 2-D vertical rectangular box that has the same longitudinal section as the 3-D model FPSOs give somewhat similar results to 3-D predictions along the centre-line. This similarity may be due partly to the fact that increases in on-deck flow velocity due to increased freeboard exceedance in the 2-D simulations compensates for a lack of focusing of the on-deck flow observed in the 3-D simulations. This finding has implications for understanding how computationally cheaper 2-D greenwater simulations relate to more realistic 3-D greenwater events. (C) 2018 Elsevier Ltd. All rights reserved.
|Number of pages||19|
|Journal||Journal of Fluids and Structures|
|Publication status||Published - Jan 2019|
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Watson, P., Cassidy, M., Efthymiou, M., Ivey, G., Jones, N., Cheng, L., Draper, S., Zhao, M., Randolph, M., Gaudin, C., O'Loughlin, C., Hodkiewicz, M., Cripps, E., Zhao, W., Wolgamot, H., White, D., Doherty, J., Taylor, P., Stanier, S. & Gourvenec, S.
1/01/14 → 30/12/22