Sensitivity to aerodynamic forces for the accurate modelling of floating offshore wind turbines

Fernandes, Gerson C.; Make, Michel; Gueydon, Sébastien; Vaz, Guilherme

doi:10.1201/b18973-108

Cited by 4 publications

(3 citation statements)

References 1 publication

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“…Regular wave tests with 1/60 steepness were carried out for three periods (8,11, and 16 seconds) and three wave headings (0, 60, and 90 degrees) without the hybrid system present. Regular wave tests for 8 and 11 second wave periods at 0 degree wave heading were also carried out with the hybrid system present: without wind, with constant wind at 8 m/s, and with constant wind at 15 m/s.…”

Section: Regular and Pink Wave Testsmentioning

confidence: 99%

“…Improvements to the turbine performance in a wave basin have been documented, but it is not currently possible to simultaneously match the thrust, torque, and slope of the thrust curve adequately [8][9][10]. Numerical code validation using tests with non-geometrically scaled rotors has also proved challenging due to three-dimensional effects at low Reynolds numbers which are not accounted for by commonly used methods such as blade/element momentum [11].…”

Section: Introductionmentioning

confidence: 99%

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Real-Time Hybrid Model Testing of a Braceless Semi-Submersible Wind Turbine: Part II — Experimental Results

Bachynski

Thys

Sauder

et al. 2016

Volume 6: Ocean Space Utilization; Ocean Renewable Energy

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Real-Time Hybrid Model (ReaTHM) tests of a braceless semi-submersible wind turbine were carried out at MARIN-TEK's Ocean Basin in 2015. The tests sought to evaluate the performance of the floating wind turbine (FWT) structure in environmental conditions representative of the Northern North Sea. In order to do so, the tests employed a new hybrid testing method, wherein simulated aerodynamic loads were applied to the physical structure in the laboratory. The test method was found to work well, and is documented in [1].The present work describes some of the experimental results. The test results showed a high level of repeatability, and permitted accurate investigation of the coupled responses of a FWT, including unique conditions such as blade pitch faults. For example, the influence of the wind turbine controller can be seen in decay tests in pitch and surge. In regular waves, aerodynamic loads due to constant wind had little influence on the structure motions (except for the mean offsets). Tests in irregular waves with and without turbulent wind are compared directly, and the influence of the wave-frequency motions on the aerodynamic damping of wind-induced low-frequency motions can be observed.

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Section: Regular and Pink Wave Testsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Real-Time Hybrid Model Testing of a Braceless Semi-Submersible Wind Turbine: Part II — Experimental Results

Bachynski

Thys

Sauder

et al. 2016

Volume 6: Ocean Space Utilization; Ocean Renewable Energy

View full text Add to dashboard Cite

show abstract

“…Therefore instead of using XFOIL, data coming from 2D RANS computations were used. Although the RANS based results were useful in analysing 2D scaling effects its use in conjunction with BEMT did not result in improved performance predictions due to the highly 3D character of the flow which is not considered within the conventional BEMT [12]. However, this method was just applied in the model scale simulation.…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic performance detecting for floating offshore wind turbine using RANS-BEMT approach

Lin

Vassalos

2016

2016 Techno-Ocean (Techno-Ocean)

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Abstract-Nowadays the demands for floating offshore wind turbine (FOWT) have exceeded 5MW with the rapidly growing wind market. The aerodynamic environment of FOWT is more complex than onshore or fixed offshore wind turbine due to larger motions of the floating platform. However, a limited simulation and load estimation capability make aerodynamic analysis a challenge. It is questionable whether some industry aerodynamic analysis codes like conventional Blade Element Momentum theory (BEMT) is accurate. Results suggest that current methods for predicting the aerodynamic loads are lacking. This paper presents the unsteady aerodynamic performance of National Renewable Energy Laboratory (NREL) 5MW FOWT experiencing a periodic pitch and surge motions using commercial multi-purpose CFD solver STAT CCM+ 9.02 compared with FAST v7.0. Some discrepancies are found. 3D results are used to estimate 2D airfoil characteristics to modify two important parameters in BEMT codes: the axial and the tangential induction factors by applying the reduced axial velocity method to get the local angle of attack of CFD solutions. As shown in the results, BEMT method cannot predict aerodynamic performance accurately, especially in the motion condition. Therefore, a new modified RANS (ReynoldsAverage Navier-Stokes)-BEMT approach is raised. Corrected BEMT method using the CFD airfoil results is an interesting thing to find if it can modify the accuracy of the results

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Fixed and Floating Offshore Wind Turbine Support Structures

Bachynski¹

2018

Offshore Wind Energy Technology

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Sensitivity to aerodynamic forces for the accurate modelling of floating offshore wind turbines

Cited by 4 publications

References 1 publication

Real-Time Hybrid Model Testing of a Braceless Semi-Submersible Wind Turbine: Part II — Experimental Results

Real-Time Hybrid Model Testing of a Braceless Semi-Submersible Wind Turbine: Part II — Experimental Results

Aerodynamic performance detecting for floating offshore wind turbine using RANS-BEMT approach

Fixed and Floating Offshore Wind Turbine Support Structures

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