Numerical investigation of the influence of blade helicity on the performance characteristics of vertical axis tidal turbines

Marsh, Philip; Ranmuthugala, Dev; Penesis, Irene; Thomas, Giles

doi:10.1016/j.renene.2015.03.083

Cited by 65 publications

(32 citation statements)

References 14 publications

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“…The k-ω SST turbulence model was also used in its fully turbulent formulation as it is commonly used to simulate turbine performance [2,4,[8][9][10][11][12][13][14] due to its ability to model both the boundary layer and the free stream regions. Research has shown that it can accurately predict flow separation and adverse pressure gradients as transport effects are included into the formulation of the eddy-viscosity equations [15,17].…”

Section: Turbulence and Boundary Layer Modelingmentioning

confidence: 99%

“…The 3D computational domains were generated to isolate the turbine from any boundary effects; with all boundary conditions outlined in Figure 6 and Table 2, as determined by the systematic domain size independence studies outlined in Section 2.5. Both Turbines A and B were assumed to operate at sufficient depths to ignore free surface effects, allowing the use of symmetry to reduce domain size [2,8,13,14]. Full and half domains were generated, with the half domain split along the horizontal mid plane.…”

Section: Computational Fluid Dynamics (Cfd) Modelsmentioning

confidence: 99%

“…However, the influence of laminar-to-turbulent flow transition on power output predictions is unknown, and may be significant as turbines can operate in low Reynolds number dominated flows [8]. For turbulence modeling the k-ω Shear Stress Transport (k-ω SST) model is prevalent [2,4,[8][9][10][11][12][13][14], due to its ability to model both free stream and wall bounded flows accurately. However, studies of the influence of alternative turbulence modeling schemes on the accuracy of power output predictions are limited.…”

Section: Introductionmentioning

confidence: 99%

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The influence of turbulence model and two and three-dimensional domain selection on the simulated performance characteristics of vertical axis tidal turbines

et al. 2017

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ABSTRACT:The influence of Computational Fluid Dynamics (CFD) modeling techniques on the accuracy of vertical axis turbine power output predictions was investigated. Using Two-Dimensional (2D) and Three-Dimensional (3D) models, as well as the Baseline-Reynolds Stress Models (BSL-RSM) model and the k-ω Shear Stress Transport (k-ω SST) model in its fully turbulent and laminar-to-turbulent formulation, differences in power output modeling accuracy were evaluated against experimental results from literature. The highest correlation with experimental power output was found using a 3D domain model that fully resolved the boundary layer combined with the k-ω SST laminar-to-turbulent model. The turbulent 3D fully resolved boundary layer k-ω SST model also accurately predicted power output for most rotational rates, at a significantly reduced computational cost when compared to its laminar-to-turbulent formulation. The 3D fully resolved BSL-RSM model and 3D wall function boundary layer k-ω SST model were found to poorly simulate power output. Poor output predictions were also obtained using 2D domain k-ω SST models, as they were unable to account for blade tip and strut effects. The authors suggest that 3D domain fully turbulent k-ω SST models with fully resolved boundary layer modeling are used for predicting turbine power output given their accuracy and computational efficiency.  2D CFD models cannot capture blade tip and strut effects resulting in poor power output simulation accuracy  3D CFD models can now accurately capture turbine power output without excessive computation requirements  The k-ω SST turbulence models provide the closest agreement with experimental results  Transition flow modeling is computationally demanding and only increases simulation accuracy at high rotational rates when compared to fully turbulent models  BSL-RSM and k-ω SST Wall Function models poorly simulate power output

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Section: Turbulence and Boundary Layer Modelingmentioning

confidence: 99%

Section: Computational Fluid Dynamics (Cfd) Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The influence of turbulence model and two and three-dimensional domain selection on the simulated performance characteristics of vertical axis tidal turbines

et al. 2017

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“…These facts illustrate the complexity of the flow around cross-flow water turbines. The computational study of [20] presents the influence of blade helicity on the performance of vertical axis tidal turbines. In particular they study two designs of straight blade turbines differing in the blade-strut connection.…”

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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“…Because of this effect, helical rotor has low power output when compared with a straight bladed Darrieus rotor. However, the helicity of rotor increases the self‐starting characteristics of straight bladed Darrieus rotor …”

Section: Configurations Of Cross‐flow Hydrokinetic Turbinesmentioning

confidence: 99%

A review on technology, configurations, and performance of cross‐flow hydrokinetic turbines

Saini

2019

Int J Energy Res

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Summary Increased demand of energy leads to exploration of new sources of energy. In the last few years, hydrokinetic energy technology emerged as an important area in the field of renewable energy generation. Various hydrokinetic turbines have been studied and used to harness the hydrokinetic potential. Among all hydrokinetic turbine technology, cross‐flow hydrokinetic turbine is considered as the most suitable approach for the riverine system. There are various configurations of cross‐flow hydrokinetic turbine exist for hydrokinetic energy extraction. A number of numerical and experimental studies were carried out on the performance enhancement and design optimization of different configurations under variable operating conditions. Under the present paper, review of different rotor for the configurations of the cross‐flow hydrokinetic turbines are discussed. The paper will be useful to understand the cross‐flow hydrokinetic technology in order to explore the methods for selection, performance enhancement, and design optimization of cross‐flow hydrokinetic turbines.

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Numerical investigation of the influence of blade helicity on the performance characteristics of vertical axis tidal turbines

Cited by 65 publications

References 14 publications

The influence of turbulence model and two and three-dimensional domain selection on the simulated performance characteristics of vertical axis tidal turbines

The influence of turbulence model and two and three-dimensional domain selection on the simulated performance characteristics of vertical axis tidal turbines

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

A review on technology, configurations, and performance of cross‐flow hydrokinetic turbines

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