Investigation of focused wave impact on floating platform for offshore floating wind turbine: a CFD study

Yang Zhou, Qing Xiao, Yuanchuan Liu, Atilla Incecik, Christophe Peyrard

Research output: Contribution to conferencePaper

Abstract

Most existing research related to a semi-submersible offshore floating platform focuses on the wave-structure interaction under either a regular or irregular wave condition. In order to numerically model the irregular wave impact on a semi-submersible platform hydrodynamic response with a low computational cost, in this study, a focused wave is utilized. The platform under this consideration is the DeepCwind semi-submersible platform. A high fidelity CFD numerical solver based on solving Navier-Stokes equations is adopted to estimate the dynamic response and the hydrodynamic loading of the platform. The focused wave is firstly generated based on a first order irregular wave theory in a numerical wave tank and validated against the linear wave theory results. Next, for CFD coding validation, the surface elevation of a fixed FPSO model associated with a focused wave is calculated and compared with the benchmark results. At last, the dynamic responses of the platform are numerically simulated under various focused wave parameters, and the results are compared with those obtained from an in-house potential flow theory tool at Électricité de France (EDF). It is found that the predicted CFD surge motion responses are close to those achieved with the second order potential theory while differ from the results obtained using linear potential theory. As to the pitch motion, differences are observed between two results, due to the different methods used for second order loads and viscous effects calculation. Turning to the results under different wave parameters, the surge and heave motion responses increase as the wave period goes up. However, the pitch motion is not affected significantly by varying wave periods. It may be due to the fact that the low-frequency effects have limited impact on the pitch motion. The strong nonlinearity at extremely large wave amplitude will be the task in our near future study.

Conference

Conference38th International Conference on Ocean, Offshore & Arctic Engineering
Abbreviated titleOMAE
CountryUnited Kingdom
CityGlasgow
Period9/06/1914/06/19

Fingerprint

Wind turbines
Computational fluid dynamics
Semisubmersibles
Dynamic response
Hydrodynamics
Surges (fluid)
Potential flow
Navier Stokes equations

Keywords

  • floating platform
  • offshore floating wind turbine
  • wave impact

Cite this

Zhou, Y., Xiao, Q., Liu, Y., Incecik, A., & Peyrard, C. (2019). Investigation of focused wave impact on floating platform for offshore floating wind turbine: a CFD study. Paper presented at 38th International Conference on Ocean, Offshore & Arctic Engineering, Glasgow, United Kingdom.
Zhou, Yang ; Xiao, Qing ; Liu, Yuanchuan ; Incecik, Atilla ; Peyrard, Christophe . / Investigation of focused wave impact on floating platform for offshore floating wind turbine : a CFD study. Paper presented at 38th International Conference on Ocean, Offshore & Arctic Engineering, Glasgow, United Kingdom.11 p.
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abstract = "Most existing research related to a semi-submersible offshore floating platform focuses on the wave-structure interaction under either a regular or irregular wave condition. In order to numerically model the irregular wave impact on a semi-submersible platform hydrodynamic response with a low computational cost, in this study, a focused wave is utilized. The platform under this consideration is the DeepCwind semi-submersible platform. A high fidelity CFD numerical solver based on solving Navier-Stokes equations is adopted to estimate the dynamic response and the hydrodynamic loading of the platform. The focused wave is firstly generated based on a first order irregular wave theory in a numerical wave tank and validated against the linear wave theory results. Next, for CFD coding validation, the surface elevation of a fixed FPSO model associated with a focused wave is calculated and compared with the benchmark results. At last, the dynamic responses of the platform are numerically simulated under various focused wave parameters, and the results are compared with those obtained from an in-house potential flow theory tool at {\'E}lectricit{\'e} de France (EDF). It is found that the predicted CFD surge motion responses are close to those achieved with the second order potential theory while differ from the results obtained using linear potential theory. As to the pitch motion, differences are observed between two results, due to the different methods used for second order loads and viscous effects calculation. Turning to the results under different wave parameters, the surge and heave motion responses increase as the wave period goes up. However, the pitch motion is not affected significantly by varying wave periods. It may be due to the fact that the low-frequency effects have limited impact on the pitch motion. The strong nonlinearity at extremely large wave amplitude will be the task in our near future study.",
keywords = "floating platform, offshore floating wind turbine, wave impact",
author = "Yang Zhou and Qing Xiao and Yuanchuan Liu and Atilla Incecik and Christophe Peyrard",
year = "2019",
month = "6",
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language = "English",
note = "38th International Conference on Ocean, Offshore & Arctic Engineering, OMAE ; Conference date: 09-06-2019 Through 14-06-2019",

}

Zhou, Y, Xiao, Q, Liu, Y, Incecik, A & Peyrard, C 2019, 'Investigation of focused wave impact on floating platform for offshore floating wind turbine: a CFD study' Paper presented at 38th International Conference on Ocean, Offshore & Arctic Engineering, Glasgow, United Kingdom, 9/06/19 - 14/06/19, .

Investigation of focused wave impact on floating platform for offshore floating wind turbine : a CFD study. / Zhou, Yang; Xiao, Qing; Liu, Yuanchuan; Incecik, Atilla; Peyrard, Christophe .

2019. Paper presented at 38th International Conference on Ocean, Offshore & Arctic Engineering, Glasgow, United Kingdom.

Research output: Contribution to conferencePaper

TY - CONF

T1 - Investigation of focused wave impact on floating platform for offshore floating wind turbine

T2 - a CFD study

AU - Zhou, Yang

AU - Xiao, Qing

AU - Liu, Yuanchuan

AU - Incecik, Atilla

AU - Peyrard, Christophe

PY - 2019/6/13

Y1 - 2019/6/13

N2 - Most existing research related to a semi-submersible offshore floating platform focuses on the wave-structure interaction under either a regular or irregular wave condition. In order to numerically model the irregular wave impact on a semi-submersible platform hydrodynamic response with a low computational cost, in this study, a focused wave is utilized. The platform under this consideration is the DeepCwind semi-submersible platform. A high fidelity CFD numerical solver based on solving Navier-Stokes equations is adopted to estimate the dynamic response and the hydrodynamic loading of the platform. The focused wave is firstly generated based on a first order irregular wave theory in a numerical wave tank and validated against the linear wave theory results. Next, for CFD coding validation, the surface elevation of a fixed FPSO model associated with a focused wave is calculated and compared with the benchmark results. At last, the dynamic responses of the platform are numerically simulated under various focused wave parameters, and the results are compared with those obtained from an in-house potential flow theory tool at Électricité de France (EDF). It is found that the predicted CFD surge motion responses are close to those achieved with the second order potential theory while differ from the results obtained using linear potential theory. As to the pitch motion, differences are observed between two results, due to the different methods used for second order loads and viscous effects calculation. Turning to the results under different wave parameters, the surge and heave motion responses increase as the wave period goes up. However, the pitch motion is not affected significantly by varying wave periods. It may be due to the fact that the low-frequency effects have limited impact on the pitch motion. The strong nonlinearity at extremely large wave amplitude will be the task in our near future study.

AB - Most existing research related to a semi-submersible offshore floating platform focuses on the wave-structure interaction under either a regular or irregular wave condition. In order to numerically model the irregular wave impact on a semi-submersible platform hydrodynamic response with a low computational cost, in this study, a focused wave is utilized. The platform under this consideration is the DeepCwind semi-submersible platform. A high fidelity CFD numerical solver based on solving Navier-Stokes equations is adopted to estimate the dynamic response and the hydrodynamic loading of the platform. The focused wave is firstly generated based on a first order irregular wave theory in a numerical wave tank and validated against the linear wave theory results. Next, for CFD coding validation, the surface elevation of a fixed FPSO model associated with a focused wave is calculated and compared with the benchmark results. At last, the dynamic responses of the platform are numerically simulated under various focused wave parameters, and the results are compared with those obtained from an in-house potential flow theory tool at Électricité de France (EDF). It is found that the predicted CFD surge motion responses are close to those achieved with the second order potential theory while differ from the results obtained using linear potential theory. As to the pitch motion, differences are observed between two results, due to the different methods used for second order loads and viscous effects calculation. Turning to the results under different wave parameters, the surge and heave motion responses increase as the wave period goes up. However, the pitch motion is not affected significantly by varying wave periods. It may be due to the fact that the low-frequency effects have limited impact on the pitch motion. The strong nonlinearity at extremely large wave amplitude will be the task in our near future study.

KW - floating platform

KW - offshore floating wind turbine

KW - wave impact

M3 - Paper

ER -

Zhou Y, Xiao Q, Liu Y, Incecik A, Peyrard C. Investigation of focused wave impact on floating platform for offshore floating wind turbine: a CFD study. 2019. Paper presented at 38th International Conference on Ocean, Offshore & Arctic Engineering, Glasgow, United Kingdom.