Accuracy and consistency of CFD and engineering models for simulating vertical axis wind turbine loads

Bangga, Galih; Dessoky, Amgad; Wu, Zhenlong; Rogowski, Krzysztof; Hansen, Martin Otto Lavér

doi:10.1016/j.energy.2020.118087

Cited by 40 publications

(17 citation statements)

References 39 publications

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“…This highlights the importance of modeling the decambering effect in engineering models for high solidity turbine because the blade section sees a large variation of the angle of attack along the chord, that is, as documented in refs. [39, 40]. A similar characteristic is also observed in Figure 12.…”

Section: Resultssupporting

confidence: 82%

“…The FLOWer code has been validated at IAG for VAWT computations under the turbulent wake state and under strong dynamic stall conditions. [ 10,11,39,40 ]…”

Section: Methodsmentioning

confidence: 99%

“…The background domain is large enough to contain the wake in all directions. A very recent study [ 39 ] has shown that this plays an important role for accuracy if the rotor loading is large.…”

Section: Methodsmentioning

confidence: 99%

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The Effects of Airfoil Thickness on Dynamic Stall Characteristics of High‐Solidity Vertical Axis Wind Turbines

Bangga

Hutani

Heramarwan

2021

Advcd Theory and Sims

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The flow physics of high solidity vertical axis wind turbines (VAWTs) is influenced by the dynamic stall effects. The present study is aimed at investigating the effects of airfoil thickness on the unsteady characteristics of high solidity VAWTs. Seven different national advisory committee for aeronautics (NACA) airfoils (0008, 0012, 0018, 0021, 0025, 0030, 0040) are investigated. A high fidelity computational fluid dynamics (CFD) approach is used to examine the load and flow characteristics in detail. Before the study is undertaken, the CFD simulation is validated with experimental data as well as large eddy simulation results with sound agreement. The investigation demonstrates that increasing the airfoil thickness is actually beneficial not only for suppressing the dynamic stall effects but also to improve the performance of high solidity turbines. Interestingly this is accompanied by a slight reduction in thrust component. The strength and radius of the dynamic stall vortex decrease with increasing airfoil thickness. The airfoil thickness strongly influences the pressure distributions during dynamic stall process, which is driven by the suction peak near the leading edge. The knowledge gained might be used by blade engineers for designing future turbines and for improving the accuracy of engineering models.

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Section: Resultssupporting

confidence: 82%

“…The FLOWer code has been validated at IAG for VAWT computations under the turbulent wake state and under strong dynamic stall conditions. [ 10,11,39,40 ]…”

Section: Methodsmentioning

confidence: 99%

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The Effects of Airfoil Thickness on Dynamic Stall Characteristics of High‐Solidity Vertical Axis Wind Turbines

Bangga

Hutani

Heramarwan

2021

Advcd Theory and Sims

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“…He concluded that the pairs of opposite-rotating turbines exhibit faster rotation compared with the isolated rotor in the same wind speed, hence a 70% performance improvement was noticed at a 1.6 equivalent turbine diameter spacing. Bangga et al, meanwhile, used three CFD codes, namely, FLOWer, TAU and Ansys Fluent to predict the power curves of three different turbines with varying solidity of σ = 0.23, 0.53 and 1.325 [17]. In this study, the authors established that CFD show reasonable accuracy after reintegrating thrust force in comparison to the experimental data.…”

Section: Introductionmentioning

confidence: 84%

Varying VAWT Cluster Configuration and the Effect on Individual Rotor and Overall Cluster Performance

Silva

Danao

2021

Energies

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The effect of separation distance between turbines on overall cluster performance were simulated using computational fluid dynamics software and we found that at a distance equivalent to two rotors, there was an improvement of +8.06% in the average performance of the cluster compared to a single, isolated turbine. A very small improvement in performance was noted at the equivalent distance of 12 rotor diameters. The performances of three individual turbines in pyramid- and inverted pyramid-shaped vertical axis wind turbine clustered farm configurations with varying oblique angles at a fixed spacing of two equivalent rotor diameters were also investigated. The design experiment involves the simulation of test cases with oblique angles from 15° to 165° at an interval of 15° and the turbines were allowed to rotate through 18 full rotations. The results show that the left and right turbines increase in performance as the angle with respect to the streamline axis increases, with the exception of the 165° angle. The center turbine, meanwhile, attained its maximum performance at a 45° oblique angle. The maximum cluster performance was found to be in the configuration where the turbines were oriented in a line (i.e., side by side) and perpendicular to the free-stream wind velocity, exhibiting an overall performance improvement of 9.78% compared to the isolated turbine. Other array configurations show improvements ranging from 6.58% to 9.57% compared to the isolated turbine, except in the extreme cases of 15° and 165°, where a decrease in the cluster performance was noted due to blockage induced by the left and right turbines, and the center turbines, respectively.

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“…Opływ tego rodzaju wirnika jest bardzo złożony i zwykle nie może być rozważany jako stacjonarny. Dodatkowo geometria wirnika bardzo utrudnia opracowanie siatki strukturalnej w jego otoczeniu [7]. Dlatego zazwyczaj stosowana bywa siatka obliczeniowa hybrydowa złożona z siatki strukturalnej w pobliżu krawędzi łopat oraz siatki niestrukturalnej w pozostałym obszarze [12].…”

Section: Wstępunclassified

Analiza własności aerodynamicznych profilu NACA 0018 w zakresie małych liczb Reynoldsa

Kątski¹,

Rogowski²

2020

Mechanika W Lotnictwie ML-XIX 2020

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W pracy przedstawiono rezultaty badań numerycznych profilu aerodynamicznego NACA 0018 w zakresie małych liczb Reynoldsa od 10 000 do 1mln oraz w zakresie kątów natarcia od 0◦ do 20◦. Wyniki zaprezentowano w postaci charakterystyk współczynników siły nośnej i oporu w funkcji kąta natarcia. Badania przeprowadzono, wykorzystując model turbulencji k-! SST oraz hybrydową siatkę obliczeniową złożoną z siatki strukturalnej w pobliżu krawędzi profilu oraz siatkę niestrukturalną w pozostałym obszarze domeny obliczeniowej. Intencją autorów pracy było pokazanie możliwości zastosowania podejścia numerycznego w badaniach profili w zakresie małych liczb Reynoldsa. Przeprowadzone badania pokazały, że minimalna liczba Reynoldsa, przy której wartość błędu jest akceptowalna, wynosi 40 000. Rezultaty badań symulacyjnych sił aerodynamicznych przedstawiono również tabelarycznie do wykorzystania w innych analizach.

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Accuracy and consistency of CFD and engineering models for simulating vertical axis wind turbine loads

Cited by 40 publications

References 39 publications

The Effects of Airfoil Thickness on Dynamic Stall Characteristics of High‐Solidity Vertical Axis Wind Turbines

The Effects of Airfoil Thickness on Dynamic Stall Characteristics of High‐Solidity Vertical Axis Wind Turbines

Varying VAWT Cluster Configuration and the Effect on Individual Rotor and Overall Cluster Performance

Analiza własności aerodynamicznych profilu NACA 0018 w zakresie małych liczb Reynoldsa

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