Wake prediction of horizontal-axis wind turbine using full-rotor modeling

Abdelsalam, Ali M.; Velraj, R.

doi:10.1016/j.jweia.2013.11.005

Cited by 66 publications

(41 citation statements)

References 31 publications

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“…One of the biggest advantages of using the VTM to predict the structure of the wake is the detail to which the vorticity field is calculated. The value of the presented results lies in the detailed assessment of small-scale flow phenomena, and this detailed assessment of the wake further than 12R down-stream of the turbine remains unchallenged by studies which have relied on conventional CFD techniques (for example [3] and [13]). Churchfield et al [2] (who used a LES equipped CFD solver) states a limitation of their modelling approach: "wall-modeled LES does not resolve down to where the actual physically-occurring peak in streamwise velocity variance occurs.…”

Section: Resultsmentioning

confidence: 99%

Simulating the Wake Downstream of a Horizontal Axis Tidal Turbine Using a Modified Vorticity Transport Model

Vybulkova

Vezza

Brown

2016

IEEE J. Oceanic Eng.

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Vybulkova, L., Vezza, M., and Brown, R. (2016) Simulating the wake downstream of a horizontal axis tidal turbine using a modified vorticity transport model. IEEE Journal of Oceanic Engineering, 41(2), pp. 296-301.There may be differences between this version and the published version. You are advised to consult the publisher's version if you wish to cite from it.http://eprints.gla.ac.uk/119684/ In order to decrease the need for fossil fuels, the alternative energy resources must be not only economically viable but also sustainable in the long-term. One of the most promising alternatives is the marine renewable energy resource.The relatively young marine energy industry is presented with two challenges. Firstly, to deliver a continuous reliable power supply and secondly, to minimize potentially harmful effects of the power extraction on the marine environment.The requirement to understand the interactions between a tidal turbine and the surrounding flow environment motivated the present work. A tidal turbine mounted on the seabed induces a wake that extends far down-stream of the device.As the direction of tidal flow changes so does the position of the wake with respect to the device The detailed study of the turbine wake has been conducted by means of computer simulations. An existing finite-volume computer model called the Vorticity Transport Model has been modified to suit the purpose of simulating the wake of a horizontal-axis tidal turbine subjected to a non-uniform flow typical of that close to the seabed. High-resolution computer simulations suggest that a progressive fragmentation of the vortical structure occurs during the development of the wake of a tidal turbine. The predicted fragmentation generates small-scale unsteady flow phenomena beyond five rotor diameters down-stream of the device in the area previously thought unaffected by the presence of a tidal turbine. The effects of non-uniform flow on the vorticity structure down-stream of a tidal turbine and the fragmentation process are analysed in this work.

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Section: Resultsmentioning

confidence: 99%

Simulating the Wake Downstream of a Horizontal Axis Tidal Turbine Using a Modified Vorticity Transport Model

Vybulkova

Vezza

Brown

2016

IEEE J. Oceanic Eng.

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“…The distribution of vortices is greatly influenced by the type of rotor modelling and it is significant to resolve the rotor geometry for capturing the wake vortices. AbdelSalam et al [5] also reported the advantages of fully resolving the rotor geometry in terms of prediction of the wake velocity. Modelling of the natural wind is also important to simulate actual operations.…”

Section: Introductionmentioning

confidence: 99%

CFD simulations of a wind turbine for analysis of tip vortex breakdown

Kimura

Tanabe

Aoyama

et al. 2016

J. Phys.: Conf. Ser.

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Abstract. This paper discusses about the wake structure of wind turbine via the use of URANS and Quasi-DNS, focussing on the tip vortex breakdown. The moving overlapped structured grids CFD Solver based on a fourth-order reconstruction and an all-speed scheme, rFlow3D is used for capturing the characteristics of tip vortices. The results from the Model Experiments in Controlled Conditions project (MEXICO) was accordingly selected for executing wake simulations through the variation of tip speed ratio (TSR); in an operational wind turbine, TSR often changes in value. Therefore, it is important to assess the potential effects of TSR on wake characteristics. The results obtained by changing TSR show the variations of the position of wake breakdown and wake expansion. The correspondence between vortices and radial/rotational flow is also confirmed.

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“…The principal objective in the past is based on the productivity global of wind turbine. However, wind energy also has several minuses, which are hindering its global use (AbdelSalam (2014)). One of its major problems is noise because it directly affects nearby residents, especially aerodynamic noise, emitted from the wind turbine blades.…”

Section: Introductionmentioning

confidence: 99%

Reducing Noise Generated from a Wind Turbine Blade by Pitch Angle Control using CFD and Acoustic Analogy

Mohamed

Dizène

Mihoubi

2017

JAFM

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Investigation of the effects blade pitch angle on noise emission from a horizontal axis wind turbine is the goal of this paper. To understand the flow around blade wind turbine, and to reduce noise emission in order to respect noise regulation, especially a residential area , three different pitch angles 0°, 3°, and 6° are tested, using computational aerodynamic and aero acoustic methods. Three dimensional flow simulations are carried out with two unsteady CFD simulations URANS, DES used to calculate the near-field flow around a HAWT of NREL Phase VI small scale. The far field noise is predicted from the simulated sources by the Ffowcs William and Hawkings analogy, and compared and validated with available test data for a small-scaled model of the NREL Phase VI. The comparison demonstrates a generally good agreement between DES predicted and measured noise levels. It can be seen that the noise emission increases by decreasing pitch angle. Moreover, the pitch angle control has a significant effect on the noise emission especially in the intermediate frequency range. We show that it is possible to reduce the noise level by control pitch angle without losing too much the power.

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Wake prediction of horizontal-axis wind turbine using full-rotor modeling

Cited by 66 publications

References 31 publications

Simulating the Wake Downstream of a Horizontal Axis Tidal Turbine Using a Modified Vorticity Transport Model

Simulating the Wake Downstream of a Horizontal Axis Tidal Turbine Using a Modified Vorticity Transport Model

CFD simulations of a wind turbine for analysis of tip vortex breakdown

Reducing Noise Generated from a Wind Turbine Blade by Pitch Angle Control using CFD and Acoustic Analogy

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