Influence of second order wave excitation loads on coupled response of an offshore floating wind turbine
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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.
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.
참고문헌 (28)
- "HAWC2 website" (2019)[URL]
- IEA Wind 2013 Annual Report, "IEA", Executive Committee. International Energy Agency, ~ (2013)
- Abdulqadir, S. A., "The physical modelling and aerodynamics of turbulent flows around horizontal axis wind turbines", Energy, 119, pp.767~799 (2017)
- Cheng, P., "A numerical model for fully coupled aerohydrodynamic analysis of floating offshore wind turbine", Ocean Eng, 173, pp.183~196 (2019)
- Global Offshore Wind Market Report, "Dugstad, J.", Norwegian Energy Partners, ~ (2018)
- "Equinor website may" (2019)[URL]
- Faltinsen, O. M., "Sea Load on Ships and Offshore Structures" (1990), Cambridge University Press
- Faltinsen, O. M., "Prediction of resistance and propulsion of a ship in a seaway", 13-th Symp. Naval Hydrodynamics (1980)
- "Floatgen website" (2019)[URL]
- Gao, Z., "Comparative numerical and experimental study of two combined wind and wave energy concepts", J. Ocean Eng. Sci, 1, pp.36~51 (2016)
- Jonkman, J. M., "Dynamics of offshore floating wind turbines-model development and verification", Wind Energy, 12, pp.459~492 (2009)[DOI]
- DNVGL, "Wadam User's manual", ~
- "DNVGL Bladed website" (2019)[URL]
- Liu, Y., "Establishing a fully coupled CFD analysis tool for floating offshore wind turbines", Renew. Energy, 112, pp.280~301 (2017)
- Luan, C., "Experimental validation of a time-domain approach for determining sectional loads in a floating wind turbine hull subjected to moderate waves", Energy Procedia, 137, pp.366~381 (2017)
- Ma, Y., "Wind-wave induced dynamic response analysis for motions and mooring loads of a spar-type offshore floating wind turbine", J. Hydrodyn., Ser. B, 26(6), pp.865~874 (2015)
- Marino, E., "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, pp.275~288 (2013)
- Maruo, H., "The drift of a body floating in waves", J. Ship Res, 4(3), pp.1~10 (1960)
- "Orcaflex website" (2019)[URL]
- "Principle power website" (2019)[URL]
- Robertson, A., "Definition of the semisubmersible floating system for phase II of OC4", ~ (2014)
- Shen, X., "Study of the unsteady aerodynamics of floating wind turbines", Energy, 145, pp.793~809 (2018)
- "Sintef Ocean website" (2019)[URL]
- Ullah, A., "Effect of hydrostatic nonlinearity on the large amplitude response of a spar type floating wind turbine", Ocean Eng, 172, pp.803~816 (2019)
- "Wamit website" (2019)[URL]
- "NREL website" (2019)[URL]
- "Wind power offshore" (2019)[URL]
- Ye, K., "Current, wave, wind and interaction induced dynamic response of a 5MW spar-type offshore direct-drive wind turbine", Eng. Struct, 178, pp.395~409 (2019)