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Focused wave interactions with floating structures: A blind comparative study

Ransley, Edward Jack and Brown, Scott Andrew and Hann, Martyn and Greaves, Deborah M and Windt, Christian and Ringwood, John and Davidson, Josh and Schmitt, Pal and Yan, Shiqiang and Wang, Junxian X and Wang, Jinghua H and Ma, Qingwei and Xie, Zhihua and Giorgi, Giuseppe and Hughes, Jack and Williams, Alison and Masters, Ian and Lin, Zaibin and Chen, Hao and Qian, Ling and Ma, Zhihua and Chen, Qiang and Ding, Haoyu and Zang, Jun and Van Rij, Jennifer and Yu, Yi-Hsiang and Li, Zhaobin and Bouscasse, Benjamin and Ducrozet, Guillaume and Bingham, Harry (2020) Focused wave interactions with floating structures: A blind comparative study. Proceedings of the Institution of Civil Engineers - Engineering and Computational Mechanics. pp. 1-34. ISSN 1755-0777

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Abstract

The paper presents results from the Collaborative Computational Project in Wave Structure Interaction (CCP-WSI) Blind Test Series 2. Without prior access to the physical data, participants, with numerical methods ranging from low-fidelity linear models to fully non-linear Navier−Stokes (NS) solvers, simulate the interaction between focused wave events and two separate, taut-moored, floating structures: a hemispherical-bottomed cylinder and a cylinder with a moonpool. The ‘blind’ numerical predictions for heave, surge, pitch and mooring load, are compared against physical measurements. Dynamic time warping is used to quantify the predictive capability of participating methods. In general, NS solvers and hybrid methods give more accurate predictions; however, heave amplitude is predicted reasonably well by all methods; and a WEC-Sim implementation, with CFD-informed viscous terms, demonstrates comparable predictive capability to even the stronger NS solvers. Large variations in the solutions are observed (even among similar methods), highlighting a need for standardisation in the numerical modelling of WSI problems.

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