Numerical simulations of a large offshore wind turbine exposed to turbulent inflow conditions

Bangga, Galih; Guma, Giorgia; Lutz, Thorsten; Krämer, Ewald

doi:10.1177/0309524x18756958

“…two different polar datasets, namely the polar obtained from 2D CFD computations with and without a stall delay model based on [50], are considered for comparison. The same 2D polar datasets were used in [51]. The comparison is displayed in Figure 8, showing F n F t distributions over the blade radius.…”

Section: D Cfd and Bem Comparisonmentioning

confidence: 99%

Comparison of Blade Element Method and CFD Simulations of a 10 MW Wind Turbine

Bangga¹

2018

Preprint

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The present studies deliver the computational investigations of a 10 MW turbine with a diameter of 205.8 m developed within the framework of the AVATAR (Advanced Aerodynamic Tools for Large Rotors) project. The simulations were carried out using two methods with different fidelity levels, namely the computational fluid dynamics (CFD) and blade element and momentum (BEM) approaches. For this purpose, a new BEM code namely B-GO was developed employing several correction terms and three different polar and spatial interpolation options. Several flow conditions were considered in the simulations, ranging from the design condition to the off-design condition where massive flow separation takes place, challenging the validity of the BEM approach. An excellent agreement is obtained between the BEM computations and the 3D CFD results for all blade regions, even when massive flow separation occurs on the blade inboard area. The results demonstrate that the selection of the polar data can influence the accuracy of the BEM results significantly, where the 3D polar datasets extracted from the CFD simulations are considered the best. The BEM prediction depends on the interpolation order and the blade segment discretization.

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“…To demonstrate that this polar dataset is suitable for the computations, two different polar datasets, namely the polar obtained from 2D CFD computations with and without a stall delay model based on [49], are considered for comparison. The same 2D polar datasets were used in [50]. The comparison is displayed in Figure 8, showing F n F t distributions over the blade radius.…”

Section: D Cfd and Bem Comparisonmentioning

confidence: 99%

Comparison of Blade Element Method and CFD Simulations of a 10 MW Wind Turbine

Bangga

¹

2018

Fluids

Self Cite

View full text Add to dashboard Cite

The present studies deliver the computational investigations of a 10 MW turbine with a diameter of 205.8 m developed within the framework of the AVATAR (Advanced Aerodynamic Tools for Large Rotors) project. The simulations were carried out using two methods with different fidelity levels, namely the computational fluid dynamics (CFD) and blade element and momentum (BEM) approaches. For this purpose, a new BEM code namely B-GO was developed employing several correction terms and three different polar and spatial interpolation options. Several flow conditions were considered in the simulations, ranging from the design condition to the off-design condition where massive flow separation takes place, challenging the validity of the BEM approach. An excellent agreement is obtained between the BEM computations and the 3D CFD results for all blade regions, even when massive flow separation occurs on the blade inboard area. The results demonstrate that the selection of the polar data can influence the accuracy of the BEM results significantly, where the 3D polar datasets extracted from the CFD simulations are considered the best. The BEM prediction depends on the interpolation order and the blade segment discretization.

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“…The most representative one is the "Hywind" in Norway, which is the first floating offshore wind turbine project in the world [5]. The tension leg platform (TLP) because of its excellent performance, has gradually become an important type of structure of developing deep-sea wind resources [6].…”

Section: Introductionmentioning

confidence: 99%

A Comprehensive Study on the Serbuoys Offshore Wind Tension Leg Platform Coupling Dynamic Response under Typical Operational Conditions

Ma

¹

,

Ren

²

,

Wang

³

et al. 2019

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A new type of offshore wind tension leg platform (TLP) connected with a series of buoys (Serbuoys-TLP) is proposed. With the consideration of coupling effect, derivations on the stiffness of the Serbuoys-TLP mooring lines are given. The complicated coupling motion characteristics of the TLP with buoys system are investigated by means of experiments and numerical analysis. The suppressive efficiency on the surge under some condition is nearly 68%, when the wave period is the common wave period of the East China Sea (6 s). Namely, the suppressive effect of series buoys on surge motion response of TLP is analyzed. Through several aspects of suppressive effect on the surge including wave properties, submerge volume and position of buoys are investigated. The modal analysis method is also adopted to interpret the coupled motion response. In the end, the responses of TLP and Serbuoys-TLP are simulated under actual sea conditions with the consideration of wind, wave and current. Based on the parametric study using the modal analysis combined with hydrodynamic analysis, the conclusion can be drawn that the surge of TLP can be effectively suppressed by the addition of a series of buoys in the Serbuoys-TLP.

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Numerical simulations of a large offshore wind turbine exposed to turbulent inflow conditions

Cited by 18 publications

References 21 publications

Comparison of Blade Element Method and CFD Simulations of a 10 MW Wind Turbine

Comparison of Blade Element Method and CFD Simulations of a 10 MW Wind Turbine

Comparison of Blade Element Method and CFD Simulations of a 10 MW Wind Turbine

A Comprehensive Study on the Serbuoys Offshore Wind Tension Leg Platform Coupling Dynamic Response under Typical Operational Conditions

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