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http://dx.doi.org/10.1016/j.ijnaoe.2020.01.003

Influence of second order wave excitation loads on coupled response of an offshore floating wind turbine  

Chuang, Zhenju (Naval Architecture and Ocean Engineering College, Dalian Maritime University)
Liu, Shewen (Naval Architecture and Ocean Engineering College, Dalian Maritime University)
Lu, Yu (Naval Architecture and Ocean Engineering College, Dalian Maritime University)
Publication Information
International Journal of Naval Architecture and Ocean Engineering / v.12, no.1, 2020 , pp. 367-375 More about this Journal
Abstract
This paper presents an integrated analysis about dynamic performance of a Floating Offshore Wind Turbine (FOWT) OC4 DeepCwind with semi-submersible platform under real sea environment. The emphasis of this paper is to investigate how the wave mean drift force and slow-drift wave excitation load (Quadratic transfer function, namely QTF) influence the platform motions, mooring line tension and tower base bending moments. Second order potential theory is being used for computing linear and nonlinear wave effects, including first order wave force, mean drift force and slow-drift excitation loads. Morison model is utilized to account the viscous effect from fluid. This approach considers floating wind turbine as an integrated coupled system. Two time-domain solvers, SIMA (SIMO/RIFLEX/AERODYN) and FAST are being chosen to analyze the global response of the integrated coupled system under small, moderate and severe sea condition. Results show that second order mean drift force and slow-drift force will drift the floater away along wave propagation direction. At the same time, slow-drift force has larger effect than mean drift force. Also tension of the mooring line at fairlead and tower base loads are increased accordingly in all sea conditions under investigation.
Keywords
Floating offshore wind turbine; Mean drift force; Slow-drift wave excitation loads; QTF; OC4 DeepCwind;
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  • Reference
1 Equinor website may. https://www.equinor.com/en/what-we-do/hywind-wherethe-wind-takes-us.html, 2019.
2 Faltinsen, O.M., 1990. Sea Load on Ships and Offshore Structures. Cambridge University Press.
3 Faltinsen, O.M., Minsaas, K.J., Liapias, N., Skjordal, S.O., 1980. Prediction of resistance and propulsion of a ship in a seaway. In 13-th Symp. Naval Hydrodynamics, Tokyo.
4 Floatgen website. https://floatgen.eu/en/demonstration-and-benchmarkingfloating-wind-turbine-system-power-generation-atlantic-deep-waters, May, 2019.
5 Gao, Z., Moan, T., Wan, L., Michailides, C., 2016. Comparative numerical and experimental study of two combined wind and wave energy concepts. J. Ocean Eng. Sci. 1, 36-51.   DOI
6 Jonkman, J.M., 2009. Dynamics of offshore floating wind turbines-model development and verification. Wind Energy 12, 459e492. https://doi.org/10.1002/we.347.   DOI
7 Liu, Y., Xiao, Q., Incecik, A., Peyrard, C., Wan, D., 2017. Establishing a fully coupled CFD analysis tool for floating offshore wind turbines. Renew. Energy 112, 280-301.   DOI
8 Luan, C., Chabaud, V., Bachynskib, E., Gao, Z., Moan, T., 2017. Experimental validation of a time-domain approach for determining sectional loads in a floating wind turbine hull subjected to moderate waves. Energy Procedia 137, 366-381.   DOI
9 Ma, Y., Hu, Z., Xiao, L., 1 January 2015. Wind-wave induced dynamic response analysis for motions and mooring loads of a spar-type offshore floating wind turbine. J. Hydrodyn., Ser. B Vol. 26 (Issue 6), 865-874.
10 Marino, E., Lugni, C., Borri, C., 1 March 2013. A novel numerical strategy for the simulation of irregular nonlinear waves and their effects on the dynamic response of offshore wind turbines. Comput. Methods Appl. Mech. Eng. 255, 275-288.   DOI
11 Maruo, H., 1960. The drift of a body floating in waves. J. Ship Res. 4 (3), 1-10.
12 Orcaflex website. https://www.orcina.com/orcaflex/, May, 2019.
13 DNVGL, Wadam User's manual.
14 DNVGL Bladed website. https://www.dnvgl.com/services/wind-turbine-designsoftware-bladed-3775, May, 2019.
15 Principle power website. http://www.principlepowerinc.com/en/windfloat, May, 2019.
16 Robertson, A., Jonkman, J., Masciola, M., Song, H., 2014. Definition of the semisubmersible floating system for phase II of OC4.
17 Shen, X., Chen, J., Hu, P., Zhu, X., Du, Z., 2018. Study of the unsteady aerodynamics of floating wind turbines. Energy 145, 793-809.   DOI
18 Sintef Ocean website. https://www.sintef.no/projectweb/nowitech/innovation/simo-riflex-trl7/, May, 2019.
19 Wamit website. https://www.wamit.com/, May, 2019.
20 Ullah, A., Muhammad, N., Choi, D., 2019. Effect of hydrostatic nonlinearity on the large amplitude response of a spar type floating wind turbine. Ocean Eng. 172, 803-816.   DOI
21 Abdulqadir, S.A., Iacovides, H., Nasser, A., 2017. The physical modelling and aerodynamics of turbulent flows around horizontal axis wind turbines. Energy 119, 767-799.   DOI
22 NREL website. https://nwtc.nrel.gov/FAST, May, 2019.
23 Wind power offshore. https://www.windpoweroffshore.com/article/1490217/japanese-floater-ready-installation, May, 2019.
24 Ye, K., Ji, J., 1 January 2019. Current, wave, wind and interaction induced dynamic response of a 5MW spar-type offshore direct-drive wind turbine. Eng. Struct. 178, 395-409.   DOI
25 HAWC2 website. http://www.hawc2.dk/hawc2-info, May, 2019.
26 IEA, 2014. IEA Wind 2013 Annual Report. Prepared by the Executive Committee of the Implementing Agreement for Co-operation in the Research, Development. and Deployment of Wind Energy Systems of the International Energy Agency.
27 Cheng, P., Huang, Yang, Wan, D., 2019. A numerical model for fully coupled aerohydrodynamic analysis of floating offshore wind turbine. Ocean Eng. 173, 183-196.   DOI
28 Dugstad, J., 2018. Global Offshore Wind Market Report. Norwegian Energy Partners.