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3. OC6 Phase Ib: Validation of the CFD predictions of difference-frequency wave excitation on a FOWT semisubmersible

Author

Wang, Lu, Robertson, Amy, Jonkman, Jason, Yu, Yi-Hsiang, Koop, Arjen, Borràs Nadal, Adrià, Li, Haoran, Bachynski-Polić, Erin, Pinguet, Romain, Shi, Wei, Zeng, Xinmeng, Zhou, Yang, Xiao, Qing, Kumar, Rupesh, Sarlak, Hamid, Ransley, Edward, Brown, Scott, Hann, Martyn, Netzband, Stefan, Wermbter, Malwin, and Méndez López, Beatriz

Published
2021
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5. Survivability of wave energy converter and mooring coupled system using CFD

Author

Ransley, Edward Jack

Subjects
620.1, CFD, OpenFOAM, Survivability, Wave Energy Converter, RANS, VOF, Extreme waves
Abstract

This thesis discusses the development of a Numerical Wave Tank (NWT) capable of describing the coupled behaviour of Wave Energy Converters (WECs) and their moorings under extreme wave loading. The NWT utilises the open-source Computational Fluid Dynamics (CFD) software OpenFOAM(R) to solve the fully nonlinear, incompressible, Reynolds-Averaged Navier-Stokes (RANS) equations for air and water using the Finite Volume Method (FVM) and a Volume of Fluid (VOF) treatment of the interface. A method for numerically generating extreme waves is devised, based on the dispersively-focused NewWave theory and using the additional toolbox waves2Foam. A parametric study of the required mesh resolution shows that steeper waves require finer grids for mesh independence. Surface elevation results for wave-only cases closely match those from experiments, although an improved definition of the flow properties is required to generate very steep focused waves. Predictions of extreme wave run-up and pressure on the front of a fixed truncated cylinder compare well with physical measurements; the numerical solution successfully predicts the secondary loading cycle associated with the nonlinear ringing effect and shows a nonlinear relationship between incident crest height and horizontal load. With near perfect agreement during an extreme wave event, the reproduction of the six degree of freedom (6DOF) motion and load in the linearly-elastic mooring of a hemispherical-bottomed buoy significantly improves on similar studies from the literature. Uniquely, this study compares simulations of two existing WEC designs with scale-model tank tests. For the Wavestar machine, a point-absorber constrained to pitch motion only, results show good agreement with physical measurements of pressure, force and float motion in regular waves, although the solution in the wake region requires improvement. Adding bespoke functionality, a point-absorber designed by Seabased AB, consisting of a moored float and Power Take-Off (PTO) with limited stroke length, translator and endstop, is modelled in large regular waves. This represents a level of complexity not previously attempted in CFD and the 6DOF float motion and load in the mooring compare well with experiments. In conclusion, the computational tool developed here is capable of reliably predicting the behaviour of WEC systems during extreme wave events and, with some additional parameterisation, could be used to assess the survivability of WEC systems at full-scale before going to the expense of deployment at sea.

Published
2015

6. Hydro-elastic interaction of polymer materials with regular waves

Author

Puzhukkil, Krishnendu, primary, Wang, Xinyu, additional, Yang, Jingyi, additional, Borthwick, Alistair, additional, Ransley, Edward, additional, Chaplin, John, additional, Cox, Malcolm, additional, Meng, Maozhou, additional, Hann, Martyn, additional, Rawlinson-Smith, Robert, additional, Zheng, Siming, additional, Cheng, Shanshan, additional, You, Zhong, additional, and Greaves, Deborah, additional

Published
2023
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7. Graphene oxide reinforced room-temperature-vulcanising elastomers for flexible wave energy converters

Author

Wang, Xinyu, primary, Meng, Maozhou, additional, Cox, Malcolm, additional, Puzhukkil, Krishnendu, additional, Yang, Jingyi, additional, Borthwick, Alistair, additional, Ransley, Edward, additional, Cheng, Shanshan, additional, Chaplin, John, additional, Hann, Martyn, additional, Rawlinson-Smith, Robert, additional, Zheng, Siming, additional, You, Zhong, additional, and Greaves, Deborah, additional

Published
2023
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11. A Review on the Modelling of Wave-Structure Interactions Based on OpenFOAM

Author

Huang, Luofeng, primary, Li, Yuzhu, additional, Benites-Munoz, Daniela, additional, Windt, Christian Windt, additional, Feichtner, Anna, additional, Tavakoli, Sasan, additional, Davidson, Josh, additional, Paredes, Ruben, additional, Quintuna, Tadea, additional, Ransley, Edward, additional, Colombo, Marco, additional, Li, Minghao, additional, Cardiff, Philip, additional, and Tabor, Gavin, additional

Published
2022
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14. OC6 Phase Ia: CFD Simulations of the Free-Decay Motion of the DeepCwind Semisubmersible

Author

Wang, Lu, primary, Robertson, Amy, additional, Jonkman, Jason, additional, Kim, Jang, additional, Shen, Zhi-Rong, additional, Koop, Arjen, additional, Borràs Nadal, Adrià, additional, Shi, Wei, additional, Zeng, Xinmeng, additional, Ransley, Edward, additional, Brown, Scott, additional, Hann, Martyn, additional, Chandramouli, Pranav, additional, Viré, Axelle, additional, Ramesh Reddy, Likhitha, additional, Li, Xiang, additional, Xiao, Qing, additional, Méndez López, Beatriz, additional, Campaña Alonso, Guillén, additional, Oh, Sho, additional, Sarlak, Hamid, additional, Netzband, Stefan, additional, Jang, Hyunchul, additional, and Yu, Kai, additional

Published
2022
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16. Focused wave interactions with floating structures: A blind comparative study

Author

Ransley, Edward J., Brown, S. A., Hann, M., Greaves, D.M., Windt, Christian, Ringwood, John, Davidson, J., Schmitt, P., Yan, S., Wang, J.X., Ma, Q, Xie, Z., and Giorgi, G.

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 nonlinear 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.

Published
2021

17. Ocean Energy Systems Wave Energy Modeling Task 10.4: Numerical Modeling of a Fixed Oscillating Water Column

Author

Bingham, Harry B., primary, Yu, Yi-Hsiang, additional, Nielsen, Kim, additional, Tran, Thanh Toan, additional, Kim, Kyong-Hwan, additional, Park, Sewan, additional, Hong, Keyyong, additional, Said, Hafiz Ahsan, additional, Kelly, Thomas, additional, Ringwood, John V., additional, Read, Robert W., additional, Ransley, Edward, additional, Brown, Scott, additional, and Greaves, Deborah, additional

Published
2021
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19. Focused wave interactions with floating structures: a blind comparative study

Author

Ransley, Edward J., primary, Brown, Scott A., additional, Hann, Martyn, additional, Greaves, Deborah M., additional, Windt, Christian, additional, Ringwood, John, additional, Davidson, Josh, additional, Schmitt, Pal, additional, Yan, Shiqiang, additional, Wang, Junxian X., additional, Wang, Jinghua H., additional, Ma, Qingwei, additional, Xie, Zhihua, additional, Giorgi, Giuseppe, additional, Hughes, Jack, additional, Williams, Alison, additional, Masters, Ian, additional, Lin, Zaibin, additional, Chen, Hao, additional, Qian, Ling, additional, Ma, Zhihua, additional, Chen, Qiang, additional, Ding, Haoyu, additional, Zang, Jun, additional, van Rij, Jennifer, additional, Yu, Yi-Hsiang, additional, Li, Zhaobin, additional, Bouscasse, Benjamin, additional, Ducrozet, Guillaume, additional, and Bingham, Harry, additional

Published
2021
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21. Highly Accurate Experimental Heave Decay Tests with a Floating Sphere: A Public Benchmark Dataset for Model Validation of Fluid–Structure Interaction

Author

Kramer, Morten Bech, primary, Andersen, Jacob, additional, Thomas, Sarah, additional, Bendixen, Flemming Buus, additional, Bingham, Harry, additional, Read, Robert, additional, Holk, Nikolaj, additional, Ransley, Edward, additional, Brown, Scott, additional, Yu, Yi-Hsiang, additional, Tran, Thanh Toan, additional, Davidson, Josh, additional, Horvath, Csaba, additional, Janson, Carl-Erik, additional, Nielsen, Kim, additional, and Eskilsson, Claes, additional

Published
2021
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22. MODELLING THE WOLF ROCK LIGHTHOUSE

Author

Dassanayake, Darshana Tharindra, primary, Raby, Alison, additional, Ransley, Edward, additional, Antonini, Alessandro, additional, Monk, Kieran, additional, and Greaves, Deborah, additional

Published
2020
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26. A Blind Comparative Study of Focused Wave Interactions with Floating Structures (CCP-WSI Blind Test Series 3)

Author

Ransley, Edward, primary, Yan, Shiqiang, additional, Brown, Scott, additional, Hann, Martyn, additional, Graham, David, additional, Windt, Christian, additional, Schmitt, Pál, additional, Davidson, Josh, additional, Ringwood, John, additional, Musiedlak, Pierre-Henri, additional, Wang, Jinghua, additional, Wang, Junxian, additional, Ma, Qingwei, additional, Xie, Zhihua, additional, Zhang, Ningbo, additional, Zheng, Xing, additional, Giorgi, Giuseppe, additional, Chen, Hao, additional, Lin, Zaibin, additional, Qian, Ling, additional, Ma, Zhihua, additional, Bai, Wei, additional, Chen, Qiang, additional, Zang, Jun, additional, Ding, Haoyu, additional, Cheng, Lin, additional, Zheng, Jinhai, additional, Gu, Hanbin, additional, Gong, Xiwu, additional, Liu, Zhenghao, additional, Zhuang, Yuan, additional, Wan, Decheng, additional, Bingham, Harry, additional, and Greaves, Deborah, additional

Published
2020
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29. A Blind Comparative Study of Focused Wave Interactions with a Fixed FPSO-like Structure (CCP-WSI Blind Test Series 1)

Author

Ransley, Edward, primary, Yan, Shiqiang, additional, Brown, Scott Andrew, additional, Mai, Tri, additional, Graham, David, additional, Ma, Qingwei, additional, Musiedlak, Pierre-Henri, additional, Engsig-Karup, Allan Peter, additional, Eskilsson, Claes, additional, Li, Qian, additional, Wang, Jinghua, additional, Xie, Zhihua, additional, Venkatachalam, Sriram, additional, Stoesser, Thorsten, additional, Zhuang, Yuan, additional, Li, Qi, additional, Wan, Decheng, additional, Chen, Gang, additional, Chen, Hao, additional, Qian, Ling, additional, Ma, Zhihua, additional, Mingham, Clive, additional, Causon, Derek, additional, Gatin, Inno, additional, Jasak, Hrvoje, additional, Vukcevic, Vuko, additional, Downie, Steven, additional, Higuera, Pablo, additional, Buldakov, Eugeny, additional, Stagonas, Dimitris, additional, Chen, Qiang, additional, Zang, Jun, additional, and Greaves, Deborah, additional

Published
2019
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34. Wave Loads on a Point-Absorbing Wave Energy Device in Extreme Waves.

Author

Göteman, Malin, Engström, Jens, Eriksson, Mikael, Hann, Martyn, Ransley, Edward, Greaves, Deborah, and Leijon, Mats

Abstract

The article discusses research which examined the survivability of a point-absorbing wave energy converter (WEC) model in extreme wave tests with focused waves embedded in regular wave backgrounds. Topics discussed include the floats used in the study, extreme wave events derived from site-specific historical wind and wave data and the identification of the peaks and troughs in the irregular waves.

Published
2015

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