Recent advances in modeling of wind turbine wake vortical structure using a differential actuator disk theory

Watters, Christophe Sibuet; Masson, Christian

doi:10.1088/1742-6596/75/1/012037

Cited by 10 publications

(9 citation statements)

References 8 publications

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“…15, the rapid evolution of axial component of velocity at the tip and root of the actuator surface raises questions as to the origin of these variations. This characteristic is typical of the actuator surface representation : it was already observed in a previous work [12] and must be linked with the occurrence of chordwise vorticity along the actuator surface. In the case of the rotating actuator surface, all solutions exhibit at the center of the rotor an increase in axial velocity above its free-stream value, or equivalently a positive induced velocity.…”

Section: λ=8 Case : Components Of Velocitysupporting

confidence: 68%

“…Sibuet Watters & Masson [12] have obtained detailed results for the case of the finite tapered wing: For low wing aspect and taper ratios, the method has shown to yield good results of the induced drag and of the induced downwash velocity at the wing. Grid-independency has been studied and shows that a minimum number of 1000 nodes on the surface carrying discontinuities are needed.…”

Section: Fig 3: Flat Surface Modeling the Tapered Wingmentioning

confidence: 99%

“…The former studies for the finite wing discretization [12] have enable to raise a number of recommendations on the construction of calculation domain and mesh for actuator surface studies. Following these recommendations, a mesh of 201*65*46 nodes is used along axial (I), azimuthal (J) and radial (K) directions to discretize the domain of total length 3.5D, inner radius 1.5 10 -2 D, outer radius 5D where D=1.2m is the rotor diameter.…”

Section: A Calculation Set-upmentioning

confidence: 99%

“…From local control volume analysis, Leclerc & Masson [11,12] have shown the following general results for actuator surfaces : At a given location on a surface of velocity discontinuity, the velocity discontinuity is necessarily tangent to the surface, and provided that no energy is withdrawn from or added to the flow, then a system of force attached to the surface of discontinuity naturally arises and the components of this external force, per unit area are given by ( in the case of the finite wing of It is interesting to note that the scalar product of the mean velocity and the force vector is null, which implies that the system of force attached to the surface of discontinuity does not exert any work on the flow. A second, direct consequence of this system of force is related to the normal component f z which implies that there must exists a pressure jump at the actuator surface, whose magnitude is exactly equal to f z .…”

mentioning

confidence: 99%

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Moving actuator surfaces: a new concept for wind turbine aerodynamic analysis

Masson

Sibuet²

2008

REPQJ

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The actuator disk is a concept often used in wind turbine aerodynamics, where the action of the turbine on the flow is averaged over time and space. This simplification stills retain sufficient physical information for wind turbine aerodynamic design. Its limitations are essentially related to the impossibility to model the blade shed vorticity. This paper presents a more general approach that uses rotating actuator surfaces carrying velocity and pressure discontinuities which are set from knowledge of the circulation around the model blade sections and using blade element analysis. The mathematics of rotating actuator surfaces, as well as an application to the TUDelft rotor are presented in this paper. The results are encouraging.

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Section: λ=8 Case : Components Of Velocitysupporting

confidence: 68%

Section: Fig 3: Flat Surface Modeling the Tapered Wingmentioning

confidence: 99%

Section: A Calculation Set-upmentioning

confidence: 99%

mentioning

confidence: 99%

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Moving actuator surfaces: a new concept for wind turbine aerodynamic analysis

Masson

Sibuet²

2008

REPQJ

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“…The aim of this study is to improve the wind turbine simulation using the AS model (Dobrev and Massouh, 2005;Dobrev et al, 2007;Watters et al, 2007Watters et al, , 2010Shen et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical study of flow around a wind turbine rotor

Dobrev

Massouh

Memon

2013

IJESMS

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. Abstract: An improved model of an actuator surface is proposed, representing the flow around a wind turbine. This model was developed in conjunction with a Navier-Stokes solver using a blade element method for the calculation of power and wake development. Blades have been replaced with thin surfaces, and a boundary condition of 'pressure discontinuity' has been applied with rotor inflow and blade-section characteristics. The proposed improvement consists of applying tangential body forces along the chord, in addition to normal body forces resulting from pressure discontinuity along the blade cross-section. The proposed model has been validated for the flow around a horizontal-axis wind turbine. The results obtained from the proposed model are compared with the experimental results obtained from PIV-wind tunnel techniques. The comparison has displayed the necessity of the proposed model for accurate reproduction of the wake behind rotor. The rapidity of calculation, in comparison to full-geometry modelling, appears to be promising for wind farm simulations.

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Wind Turbine Wake Modeling—Possibilities with Actuator Line/Disc Approaches

Ivanell¹,

Mikkelsen²

2016

Alternative Energy and Shale Gas Encyclopedia

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Recent advances in modeling of wind turbine wake vortical structure using a differential actuator disk theory

Cited by 10 publications

References 8 publications

Moving actuator surfaces: a new concept for wind turbine aerodynamic analysis

Moving actuator surfaces: a new concept for wind turbine aerodynamic analysis

Experimental and numerical study of flow around a wind turbine rotor

Wind Turbine Wake Modeling—Possibilities with Actuator Line/Disc Approaches

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