Accuracy of the actuator disc-RANS approach for predicting the performance and wake of tidal turbines

Batten, W.M.J.; Harrison, Michael; Bahaj, A.S.

doi:10.1098/rsta.2012.0293

Cited by 90 publications

(74 citation statements)

References 18 publications

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“…An absorption disk model was conducted by using CFD software of FLUENT (ANSYS, Inc., Canonsburg, PA, USA) to predict the wake of the flow field by Sun et al [20]. Batten et al [21] proposed an approach of actuator disc-RANS, in which the turbine forces are derived using a blade-element approach to predict the performance and wake of tidal turbines. The methods of using a momentum sink to simulate tidal turbines in CFD were presented by Harrison et al [10]; the characteristics of the wakes were compared with numerical simulations.…”

Section: Introductionmentioning

confidence: 99%

Experimental Analysis and Evaluation of the Numerical Prediction of Wake Characteristics of Tidal Stream Turbine

Zhang

Zheng

et al. 2017

Energies

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Abstract:It is important to understand tidal stream turbine performance and flow field, if tidal energy is to advance. The operating condition of a tidal stream turbine with a supporting structure has a significant impact on its performance and wake recovery. The aim of this work is to provide an understanding of turbine submerged depth that governs the downstream wake structure and its recovery to the free-stream velocity profile. An experimentally validated numerical model, based on a computational fluid dynamics (CFD) tool, was present to obtain longitudinal, transverse and vertical velocity profiles. Wake characteristics measurements have been carried out in an open channel at Hohai University. The results indicate that varying the turbine proximity to the water surface introduces differential mass flow rate around the rotor that could make the wake persist differently downstream. CFD shows the same predicted wake recovery tendency with the experiments, and an agreement from CFD and experiments is good in the far-wake region. The results presented demonstrate that CFD is a good tool to simulate the performance of tidal turbines particularly in the far-wake region and that the turbine proximity to the water surface has an effect on the wake recovery.

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Section: Introductionmentioning

confidence: 99%

Experimental Analysis and Evaluation of the Numerical Prediction of Wake Characteristics of Tidal Stream Turbine

Zhang

Zheng

et al. 2017

Energies

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“…For the ACD multiple versions are available, ranging from a porous medium, [13], to the Blade Element Momentum Theory (BEMT), [2], [3]. Within the present research, the -ACD and -ACD are of relevance and detailed here.…”

Section: Actuator Disc Theory (Acd)mentioning

confidence: 99%

“…Therefore an additional source term for the turbulence is required to maintain realistic inflow turbulence. This can be either limited to the volume of ACD as proposed by [3] or applied to the full fluid domain as a floor value for ambient turbulence, [15].…”

Section: Turbulencementioning

confidence: 99%

Tidal Current Turbine Wake and Park Layout in Transient Environments

Arnold¹,

Cheng²,

Daus

et al. 2014

Volume 9B: Ocean Renewable Energy

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Due to orbital velocities of the waves, the characteristics of tidal current turbines change over time. Therefore the induction factor and subsequent the wake is time dependent. Within the present research this time dependency is investigated by using Computational Fluid Dynamics (CFD) with Virtual Free Surface (VFS) and Actuator Disc (ACD) models.Based on this setup several different wave and current scenarios are simulated and analyzed with respect to the transient velocities in the turbine wake. Special respect is taken to the velocity undulations radiated by the changing apparent velocities in the rotor plane. These undulations move with the wake of the tidal current turbines and increase wave loads on 2 nd row turbines in a park. This paper presents an efficient method for simulation of wave and park interactions and investigates dynamic turbine wakes under a large variety of parameters. Based on these simulations a suggestion for a tidal park design with respect to a balance of fatigue loads and power output is concluded.

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“…In the absence of this, the industry is currently relying on knowledge generated through simulations and the studies of model turbines in circulating water channels [14,15]. The results from these can be used in conjunction with numerical simulations to appraise current array designs for future implementation at appropriate sites [16].…”

Section: Introductionmentioning

confidence: 99%

Marine current energy conversion: the dawn of a new era in electricity production

Bahaj

2013

Phil. Trans. R. Soc. A.

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Marine currents can carry large amounts of energy, largely driven by the tides, which are a consequence of the gravitational effects of the planetary motion of the Earth, the Moon and the Sun. Augmented flow velocities can be found where the underwater topography (bathymetry) in straits between islands and the mainland or in shallows around headlands plays a major role in enhancing the flow velocities, resulting in appreciable kinetic energy. At some of these sites where practical flows are more than 1 m s −1 , marine current energy conversion is considered to be economically viable. This study describes the salient issues related to the exploitation of marine currents for electricity production, resource assessment, the conversion technologies and the status of leading projects in the field. This study also summarizes important issues related to site development and some of the approaches currently being undertaken to inform device and array development. This study concludes that, given the highlighted commitments to establish favourable regulatory and incentive regimes as well as the aspiration for energy independence and combating climate change, the progress to multi-megawatt arrays will be much faster than that achieved for wind energy development.

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Accuracy of the actuator disc-RANS approach for predicting the performance and wake of tidal turbines

Cited by 90 publications

References 18 publications

Experimental Analysis and Evaluation of the Numerical Prediction of Wake Characteristics of Tidal Stream Turbine

Experimental Analysis and Evaluation of the Numerical Prediction of Wake Characteristics of Tidal Stream Turbine

Tidal Current Turbine Wake and Park Layout in Transient Environments

Marine current energy conversion: the dawn of a new era in electricity production

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