RANS and Hybrid RANS-LES Simulations of an H-Type Darrieus Vertical Axis Water Turbine

Mejia, Omar D. Lopez; Quiñones, Jhon J.; Laı́n, Santiago

doi:10.3390/en11092348

Cited by 17 publications

(3 citation statements)

References 9 publications

(25 reference statements)

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“…Good results can be obtained with LES and DES methods, but they require much more calculation than RANS does. RANS and hybrid RANS-LES were suitable for the turbulent flow dynamics on a small scale [57]. LES was used to solve the turbulence itself in large and complex flows, and the vortex could be used to illustrate interactions between fluid and blades [58].…”

Section: Methodsmentioning

confidence: 99%

A Review: Design and Optimization Approaches of the Darrieus Water Turbine

Tan

et al. 2023

Sustainability

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As the use of Darrieus turbines in water is becoming increasingly popular in the field of renewable energy, it is essential to explore and evaluate existing research efforts. The situation of the Darrieus water turbine in water still requires further discussion. This paper aims to provide a comprehensive review of optimization methods for Darrieus water turbines, addressing the challenges associated with their efficiency, start-up, and stability. This work summarizes and evaluates the findings of previous studies, focusing on the features of experimental and numerical methods. Influence of geometric parameters, including height-diameter ratio, solidity, torsional angle, and airfoil are also talked into. The existing research adopts solidity values ranging from 0.1 to 0.4, but the design experience is not as extensive as that of the Darrieus wind turbine. Further discussions are still needed on the optimal power coefficient and tip speed ratio of the Darrieus water turbine. The research with a power coefficient ranging from about zero to above the Betz limit needs further summarization. Various optimization strategies, such as multi-turbine arrangement, coupling with Savonius turbines, and blade pitching, are also discussed. By offering insights into the current state of optimization works for Darrieus water turbines, this review aims to facilitate future research, bridge existing gaps in the field, further enrich the utilization of ocean currents, and improve the structure of renewable energy.

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Section: Methodsmentioning

confidence: 99%

A Review: Design and Optimization Approaches of the Darrieus Water Turbine

Tan

et al. 2023

Sustainability

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“…We investigated the best turbine type under the same configurations, considering that the Darrieus and Gorlov rely on the lift force principle and the Savonius relies on the drag force principle. While making the analyses, the turbine rotation area was modeled with a dynamic mesh, rather than the sliding mesh technique used in many previous studies [38,[46][47][48]. In this method, rather than assigning a specific rotation angle to the turbine, the model is run according to the angular velocity of the turbine, which changes depending on the water flow velocity.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Three Vertical Axis Turbine Designs for Improved Water Energy Efficiency

Karakaya,

Bor,

Elçi

2024

Energies

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A hydrokinetic turbine with a vertical axis is specifically designed to harvest the kinetic energy from moving water. In this study, three vertical axis water turbines, namely Gorlov, Darrieus, and Savonius turbines, were compared for their efficiency via numerical modeling for steady-state conditions via the ANSYS 2022 R2 Fluent model. The Semi-Implicit Method for Pressure-Linked Equations (SIMPLE) was implemented with an SST k-ω turbulence model. The dynamic mesh technique, which allows modeling according to changes in angular velocity at each time step, was used to simulate flow around the turbines for six different velocities (from 0.5 to 3 m/s). The efficiency of the turbines was compared and the results were analyzed. The pressure, velocity, and turbulence kinetic energy distributions around the rotor were measured at different rotational angles and results indicated a wider operating range for the Darrieus and Gorlov turbines compared to the Savonius turbine. The highest power coefficient of 0.293 was achieved in the model featuring a Darrieus turbine, corresponding to a TSR value of 1.34, compared to 0.208 for the Gorlov and 0.257 for the Savonius turbine, at TSR values of 1.3 and 1.06, respectively. Numerical modeling results pointed to a significantly higher self-starting capacity for the Savonius turbine compared to the others.

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“…Numerical simulations have thus continued to improve in their capacity to resolve the salient dynamics in the wakes of VAWTs. Mejia et al [6] used URANS (K − w SST), DES (detached eddy simulation) and DDES (delayed detached eddy simulation) methods to calculate the aerodynamic performances of an H-type Darrieus VAWT. By plotting Q isosurfaces, they demonstrated that DES and DDES are both effective in identifying vortices.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Effects of Fluctuating Wind on the Aerodynamic Performance of a Vertical-Axis Wind Turbine with Variable Pitch

Zhang,

Yang,

Chen

et al. 2023

Energies

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The wind turbine with a variable-pitch vertical axis is a novel type of small wind turbine with great development potential in the field of wind power generation. This study assessed the aerodynamic performance of a two-dimensional variable-pitch vertical-axis wind turbine (VAWT) under fluctuating wind conditions (sinusoidal-type fluctuations with an average velocity of 6 m/s) using the finite-volume method and the RNG k−ε turbulence model. The effects of the fluctuating inflow amplitude (Uamp), frequency (fc), and mean tip speed ratio (λmean) on the power coefficient of the wind turbine are analyzed. The results show that a maximum power coefficient of 0.33 is obtained when the inflow amplitude reaches 50% of the average velocity. The power coefficient initially increases and then decreases with the increase in the fluctuating inflow frequency, reaching a maximum value of 0.32 at fc=0.45 Hz. Furthermore, the power coefficient reaches its maximum value of 0.372 at λmean = 0.5. Proper orthogonal decomposition (POD) is used to decompose and reconstruct the flow field under both fluctuating and uniform inflow conditions. A comparison of the POD analysis between the two conditions shows that the energy distribution is more dispersed under the fluctuating inflow condition and reconstructing the flow field under fluctuating inflow conditions requires more POD modes than that under uniform inflow conditions.

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RANS and Hybrid RANS-LES Simulations of an H-Type Darrieus Vertical Axis Water Turbine

Cited by 17 publications

References 9 publications

A Review: Design and Optimization Approaches of the Darrieus Water Turbine

A Review: Design and Optimization Approaches of the Darrieus Water Turbine

Numerical Analysis of Three Vertical Axis Turbine Designs for Improved Water Energy Efficiency

Analysis of the Effects of Fluctuating Wind on the Aerodynamic Performance of a Vertical-Axis Wind Turbine with Variable Pitch

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