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Research Papers

Aerodynamic Interference Effect of Huge Wind Turbine Blades With Periodic Surge Motions Using Overset Grid-Based Computational Fluid Dynamics Approach

[+] Author and Article Information
Thanh Toan Tran

Graduate School of Mechanical
and Aerospace Engineering,
Research Center for Offshore Wind Turbine
Technology (ReCOWT),
Gyeongsang National University (GNU),
900 Gajwa-dong,
Jinju 660-701, South Korea

Dong-Hyun Kim

Graduate School of Mechanical
and Aerospace Engineering,
Research Center for Offshore Wind Turbine
Technology (ReCOWT),
Gyeongsang National University (GNU),
900 Gajwa-dong,
Jinju 660-701, South Korea
e-mails: dhk@gnu.ac.kr; dhk0521@gmail.com

Ba Hieu Nguyen

Graduate School of Mechanical
and Aerospace Engineering,
Research Center for Offshore Wind Turbine
Technology (ReCOWT),
Gyeongsang National University (GNU),
900 Gajwa-dong,
Jinju 660-701, South Korea

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received October 7, 2014; final manuscript received July 18, 2015; published online September 2, 2015. Assoc. Editor: Yves Gagnon.

J. Sol. Energy Eng 137(6), 061003 (Sep 02, 2015) (16 pages) Paper No: SOL-14-1284; doi: 10.1115/1.4031184 History: Received October 07, 2014; Revised July 18, 2015

The accurate prediction of unsteady aerodynamic performance and loads, for floating offshore wind turbines (FOWTs), is still questionable because several conventional methods widely used for this purpose are applied in ways that violate the theoretical assumptions of their original formulation. The major objective of the present study is to investigate the unsteady aerodynamic effects for the rotating blade due to the periodic surge motions of an FOWT. This work was conducted using several numerical approaches, particularly unsteady computational fluid dynamics (CFD) with an overset grid-based approach. The unsteady aerodynamic effects that occur when an FOWT is subjected to the surge motion of its floating support platform is assumed as a sinusoidal function. The present CFD simulation based on an overset grid approach provides a sophisticated numerical model on complex flows around the rotating blades simultaneously having the platform surge motion. In addition, an in-house unsteady blade element momentum (UBEM) and the fast (fatigue, aerodynamic, structure, and turbulence) codes are also applied as conventional approaches. The unsteady aerodynamic performances and loads of the rotating blade are shown to be changed considerably depending on the amplitude and frequency of the platform surge motion. The results for the flow interaction phenomena between the oscillating motions of the rotating wind turbine blades and the generated blade-tip vortices are presented and investigated in detail.

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Figures

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Fig. 1

Degrees-of-freedom for an offshore floating wind turbine platform

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Fig. 2

Numerical procedure for the present UBEM method

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Fig. 7

Instantaneous velocity magnitude plots at blade section r/R = 0.7 for the surge motion with respect to time (AS = 8 m and ωS = 0.500 rad/s)

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Fig. 6

Comparison of unsteady aerodynamic power and thrust coefficients among different aerodynamic methods for the platform surge motion (AS = 8 m)

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Fig. 5

Numerical convergence test of the unsteady CFD analysis for different time-step sizes the platform surge motion (AS = 8 m and ωS = 0.770 rad/s)

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Fig. 4

Variation of platform surge position (AS = 8 m and ωS = 0.500 rad/s)

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Fig. 3

Illustration of the computational mesh domain, near overset grid domain and blade surface

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Fig. 8

Variation of unsteady pressure coefficient at different blade sections with respect to time (AS = 8 m and ωS = 0.500 rad/s)

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Fig. 9

Instantaneous downstream isovorticity contours during the surge motion of the platform (AS = 8 m and ωS = 0.5 rad/s)

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Fig. 10

Visualization of instantaneous unsteady vorticity contours during the surge motion of the platform (AS = 8 m and ωS = 0.5 rad/s)

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Fig. 11

Comparison of the maximum and minimum values of unsteady aerodynamic power and thrust coefficients among different numerical methods for the platform surge motion (AS = 4 m)

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Fig. 12

Comparison of the maximum and minimum values of unsteady aerodynamic power and thrust coefficients among numerical methods for the platform surge motion (AS = 8 m)

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Fig. 13

Comparison of the maximum and minimum values of unsteady aerodynamic power and thrust coefficients among numerical methods for platform surge motion (AS = 16 m)

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Fig. 14

Lift coefficient versus angle-of-attack for different airfoil sections of the NREL 5-MW wind turbine blade

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Fig. 15

Time-dependent of angle-of-attack along different spanwise sections of the rotating blade experiencing the platform surge motion (AS = 8 m and ωS = 0.5 rad/s)

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Fig. 16

Time-dependence of reduced frequency along different spanwise sections of the rotating blade experiencing the platform surge motion (AS = 8 m and ωS = 0.5 rad/s)

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Fig. 17

Comparison of pressure coefficients of two blade sections among three different magnitudes of surge motion with respect to time (ωS = 0.5 rad/s): (a) T2 = 2/8T; (b) T4 = 4/8T; (c) T6 = 6/8T; and (d) T8 = 8/8T

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Fig. 18

Instantaneous downstream isovorticity contours of the rotor for the different magnitudes of the platform surge motion (ωS = 0.5 rad/s)

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