A review on computational fluid dynamic simulation techniques for Darrieus vertical axis wind turbines

Ghasemian, Masoud; Ashrafi, Z. Najafian; Sedaghat, Ahmad

doi:10.1016/j.enconman.2017.07.016

Cited by 164 publications

(70 citation statements)

References 82 publications

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“…The k-ω LRE model does a better job in the prediction of the maximum power coefficient and the description of the separated flow in dynamic stall condition; nevertheless the minimum value of the power coefficient is highly under-predicted in comparison to the experimental data. Ghasemian et al [24] performed an extensive review of CFD simulation techniques for vertical axis wind turbines. It was found that the k-ω SST transitional turbulence model achieve more accurate numerical results in comparison to any other fully turbulence model reported in the literature.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of the Effect of Winglets on the Performance of a Straight Blade Darrieus Water Turbine

2018

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This study deals with the three-dimensional unsteady numerical simulation of the flow around a cross-flow vertical-axis water turbine (CFWT) of the Darrieus type. The influence of turbine design on its hydrodynamic characteristics and performance is investigated by means of a time-accurate Reynolds Averaged Navier Stokes (RANS) commercial solver. The flow unsteadiness is described using a transient rotor-stator model in connection with a sliding interface. A classical Darrieus straight blade turbine, based on the NACA0025 airfoil, has been modified adding winglets (symmetric and asymmetric designs) to the blades' tips with the objective of reducing the strength of the detached trailing vortices. The turbulent features of the flow have been modelled by using different turbulence models (k-ε Renormalization Group, standard Shear Stress Transport, transition Shear Stress Transport and Reynolds Stress Model). As a result, the predicted hydrodynamic performance of the turbine including winglets increases, independently of the employed turbulence model, being the improvement higher when a symmetric winglet design is considered. Moreover, visualization of skin friction lines pattern and their connection with vorticity isosurfaces, illustrating the flow detachment in the three blade configurations, has been carried out. Finally, a short discussion about the intermittency behavior along a turbine revolution is presented.

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Section: Introductionmentioning

confidence: 99%

Numerical Study of the Effect of Winglets on the Performance of a Straight Blade Darrieus Water Turbine

2018

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“…Tidal current energy is a proven type of ocean renewable energy gaining more attention after the successful installation of the first grid-connected tidal turbine in Strangford Loch, Belfast [1]. The vertical-axis tidal current turbine, commonly known as the Darrieus turbine, is able to capture the tidal current from various flow directions without changing turbine facing as horizontal-axis turbine [2]. Scour induced by turbines is an important engineering problem in tidal power projects.…”

Section: Introductionmentioning

confidence: 99%

Temporal Evolution of Seabed Scour Induced by Darrieus-Type Tidal Current Turbine

Sun

Lam

Dai

et al. 2019

Water

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The temporal evolution of seabed scour was investigated to prevent damage around a monopile foundation for Darrieus-type tidal current turbine. Temporal scour depths and profiles at various turbine radius and tip clearances were studied by using the experimental measurements. Experiments were carried out in a purpose-built recirculating water flume associated with 3D printed turbines. The scour hole was developed rapidly in the initial process and grew gradually. The ultimate equilibrium of scour hole was reached after 180 min. The scour speed increased with the existence of a rotating turbine on top of the monopile. The findings suggested that monopile foundation and the rotating turbine are two significant considerations for the temporal evolution of scour. The scour depth is inversely correlated to the tip-bed clearance between the turbine and seabed. Empirical equations were proposed to predict the temporal scour depth around turbine. These equations were in good agreement with the experimental data.

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“…However, compared with Horizontal Axis Wind Turbine (HAWT), the VAWT has low efficiency. Therefore, many of VAWT configurations and advance technologies are employed to overcome this question [3] [4]. Among these approaches, the influence of finite wing on the aerodynamic characteristic of VAWT is considered mainly [5] [6].…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, numerical simulation method is considered as a potential research technique on the H-VAWT [13]. The Shear Stress Transport (SST) kωtransitional turbulence model have more accurate results compare with the other fully turbulence model because it could capture the flow separation phenomena [3] [14]. Although LES and RANS-LES turbulence model are also regarded as good turbulence model, the computational efficiency is lower compared with k-ω SST model.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation the Effect of the Different Tip Vanes on the Loading of an H-VAWT

Wang

Yang

et al. 2018

E3S Web Conf.

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In this paper, the effect of the three typical tip vanes on the loading of an H-VAWT is investigated by employing the three-dimensional unsteady numerical simulation method. The results show that the both transient tangential force coefficient (CT) and normal force coefficient (Cn) have obvious change when the winglet and the V type vane is used at the blade's tip, respectively. However, in three tip vanes, the CT average value is the lowest and the CT fluctuation characteristic is the highest when the winglet is used. Although the winglet and V type vane contribute to change the transient CT and Cn, the normal force is increased too, it results in increasing fatigue loading and decreasing lifetime for H-VAWT. By comparison, the effect of the plate vane on the loading is weaker. Additionally, the winglet is advantage to improve power coefficient in the low tip speed ratio.

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A review on computational fluid dynamic simulation techniques for Darrieus vertical axis wind turbines

Cited by 164 publications

References 82 publications

Numerical Study of the Effect of Winglets on the Performance of a Straight Blade Darrieus Water Turbine

Numerical Study of the Effect of Winglets on the Performance of a Straight Blade Darrieus Water Turbine

Temporal Evolution of Seabed Scour Induced by Darrieus-Type Tidal Current Turbine

Numerical Investigation the Effect of the Different Tip Vanes on the Loading of an H-VAWT

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