Aerodynamic Damping on a Semisubmersible Floating Foundation for Wind Turbines

Gueydon, Sébastien

doi:10.1016/j.egypro.2016.09.196

Cited by 27 publications

(11 citation statements)

References 16 publications

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“…No significant effect of the propeller's thrust on the aerodynamic damping could be found from the decay tests under constant thrust. The aerodynamic damping that can be expected from a wind turbine in operation [16,17] is not reproduced by this system. If the thrust has an impact on the surge period then this effect is not identical across all campaigns.…”

Section: Dampingmentioning

confidence: 90%

Round Robin Laboratory Testing of a Scaled 10 MW Floating Horizontal Axis Wind Turbine

Gueydon

Judge

O’Shea

et al. 2021

JMSE

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This paper documents the round robin testing campaign carried out on a floating wind turbine as part of the EU H2020 MaRINET2 project. A 1/60th scale model of a 10 MW floating platform was tested in wave basins in four different locations around Europe. The tests carried out in each facility included decay tests, tests in regular and irregular waves with and without wind thrust, and tests to characterise the mooring system as well as the model itself. For the tests in wind, only the thrust of the turbine was considered and it was fixed to pre-selected levels. Hence, this work focuses on the hydrodynamic responses of a semi-submersible floating foundation. It was found that the global surge stiffness was comparable across facilities, except in one case where different azimuth angles were used for the mooring lines. Heave and pitch had the same stiffness coefficient and periods for all basins. Response Amplitude Operators (RAOs) were used to compare the responses in waves from all facilities. The shape of the motion RAOs were globally similar for all basins except around some particular frequencies. As the results were non-linear around the resonance and cancellation frequencies, the differences between facilities were magnified at these frequencies. Surge motions were significantly impacted by reflections leading to large differences in these RAOs between all basins.

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Section: Dampingmentioning

confidence: 90%

Round Robin Laboratory Testing of a Scaled 10 MW Floating Horizontal Axis Wind Turbine

Gueydon

Judge

O’Shea

et al. 2021

JMSE

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“…Additionally for pitch, a sensitivity study was done by Wang et al (2021) to modify the coefficients for the mooring lines. The coefficients were seen to diverge from reference values given in Gueydon (2016) by Burmester et al (2020b).…”

Section: Introductionmentioning

confidence: 74%

CFD code comparison, verification and validation for decay tests of a FOWT semi-submersible floater

Rentschler

Chandramouli

Vaz

et al. 2022

J. Ocean Eng. Mar. Energy

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With the advancement of high-performance computation capabilities in recent years, high-fidelity modelling tools such as computational fluid dynamics are becoming increasingly popular in the offshore renewable sector. To justify the credibility of the numerical simulations, thorough verification and validation is essential. In this work, preparatory heave decay tests for a freely floating single cylinder are modelled. Subsequently, the surge and sway decays of a linearly moored floating offshore wind turbine model of the OC4 (Offshore Code Comparison Collaboration Continuation) phase II semi-submersible platform are simulated. Two different viscous-flow CFD codes are used: OpenFOAM (open-source), and ReFRESCO (community-based open-usage). Their results are compared against each other and with water tank experiments. For the single-cylinder decay simulations, it is found that the natural period is accurately modelled compared to the experimental results. Regarding the damping, both CFD codes are overly dissipative. Differences and their potential explanations become apparent in the analysis of the flow field data. Meanwhile, large numerical uncertainties especially in later oscillations make a distinct conclusion difficult. For the OC4 semi-submersible decay simulations, a better agreement in damping can be achieved, however discrepancies in results are observed when restricting the degrees of freedom of the platform. Flow field data again reveals differences between the CFD codes. Meanwhile, through the effort to use similar numerical settings and quantify the numerical uncertainties of the CFD simulations, this work represents a stepping stone towards fairer and more accurate comparison between CFD and experimental results.

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“…This may be valuable for multidisciplinary or multiscale couplings when rotor‐integrated loads are sufficient and unnecessary complexity is undesirable (e.g., when turbine‐level aerodynamics is not the central topic) and when physical understanding is desirable (for instance, for control design or when aerodynamics is not the core competence). Example applications may be Including aerodynamics in hydrodynamic studies of floating wind turbines (FWTs): impact of tangential loads, 8 higher order coupling between aerodynamic and hydrodynamic loads 9,10 design optimization of floating foundation and mooring system, interpreting wave tank testing observations. Control design of FWTs: understanding the effect of controls (coupling between blade pitch, thrust, torque, and rotor speed) and the circulatory relationship between velocity and load components for instance to address pitch control‐induced instability, 11 using individual pitch control (IPC) 12 and nonlinear control schemes. Farm simulations: wind turbine wakes being driven by rotor‐integrated loads, the current approach is sufficient and may be coupled with (1) analytical models of wake dynamics 13 for a complete analytical model of farm aerodynamics for control design purposes, (2) with mid‐fidelity models (e.g., dynamic wake meandering) with possibility for stochastic (e.g., Monte Carlo‐based) simulations in real time, or (3) high‐fidelity large eddy simulations (LES) models for multiscale coupling with the atmosphere 14 . It is expected that a physics‐based model order reduction approach will enable further physics‐based simplifications in these couplings. …”

Section: Introductionmentioning

confidence: 99%

Rotor‐integrated modeling of wind turbine aerodynamics

Chabaud

2021

Wind Energy

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A novel approach for the modeling of rotor‐integrated aerodynamic loads is suggested to answer the need for a comprehensive, insightful, and analytical actuator disc model. All the six degrees of freedom (including tangential components) are considered. It is shown that loads may be written as a quadratic form of a reduced six‐component velocity vector at the hub. The individual contributions of lift and drag, azimuthal variations, as well as blade pitching and tip losses are isolated. Errors introduced by the necessary approximations are discussed, and parametric corrections are considered. Parameter identification methods are then suggested, and the performance of the resulting calibrated analytical models is assessed. Results show that the new modeling approach is able to accurately model both the mean values of the thrust and power coefficients and their derivatives with respect to tip‐speed ratio and pitch angle across the full range of operating wind speeds. Furthermore, it is able to reconstruct the general rotor behavior with a minimal amount of information available. Tangential components are also well modeled, although they require the knowledge of airfoil properties. The model's architecture leaves room for extensions to dynamic flow, skewed flow, and azimuthal load variations.

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Aerodynamic Damping on a Semisubmersible Floating Foundation for Wind Turbines

Cited by 27 publications

References 16 publications

Round Robin Laboratory Testing of a Scaled 10 MW Floating Horizontal Axis Wind Turbine

Round Robin Laboratory Testing of a Scaled 10 MW Floating Horizontal Axis Wind Turbine

CFD code comparison, verification and validation for decay tests of a FOWT semi-submersible floater

Rotor‐integrated modeling of wind turbine aerodynamics

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