Three Dimensional CFD Simulations of A Wind Turbine Blade Section; Validation

Muiruri, Patrick; Motsamai, Oboetswe S.

doi:10.25103/jestr.111.16

Cited by 12 publications

(7 citation statements)

References 14 publications

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“…Based on conclusions drawn from validation, comparison of aerodynamic torque and flap-wise bending moment, the k-SST model was found to be the most consistent, despite minimal variation of pressure coefficient at 20 m/s. This is in agreement with literature sources which indicate that k − SST model is the most suitable turbulence models for CFD analysis of wind turbine [17,32,35]. k − SST model also showed improved separation prediction capabilities [36].…”

Section: Discussionsupporting

confidence: 91%

A comparative study of RANS-based turbulence models for an upscale wind turbine blade

2019

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Computational fluid dynamic (CFD) numerical simulations are providing alternative to experimental methods in preliminary analysis of aerodynamic behavior for large wind turbines. Shortcomings inherent by experimental methods have popularized the three dimensional CFD methods. This paper, therefore, presents a numerical analysis for NREL 5MW wind turbine rotor using a single moving reference frame approach. ANSYS Fluent is employed to model airflow over the blade's surfaces using Reynolds average Navier-Stokes equations. A steady-state incompressible pressure based solver is applied in form of absolute velocity formulation. Four turbulence models are used: k − SST, k − RNG, k − realizable and Spalart Allmaras to determine the aerodynamic torque. Mesh independence study and validation is also performed. In addition, the predicted flap-wise bending load and comparison of pressure distribution for the four turbulence models are evaluated at different sections of the blade. Due to absence of experimental data for employed blade model, the obtained aerodynamic torque was compared with other reliable numerical simulation results.

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Section: Discussionsupporting

confidence: 91%

A comparative study of RANS-based turbulence models for an upscale wind turbine blade

2019

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“…The fluid is treated as impressible and the solver type is chosen to be pressure-base type. The detailed flow chart describing the main steps of numerical simulation can be found in reference [6].…”

Section: Numerical Methodologymentioning

confidence: 99%

Numerical study of spray cooling with flash evaporation

Chen

Xie

Gong

et al. 2023

J. Phys.: Conf. Ser.

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This work aims to apply Computational Fluid Dynamic (CFD) method to establish a flash evaporation spray cooling (FESC) model to simulate the heating process and find the optimum cooling performance. The heat transfer process during FESC is studied through numerical simulation using commercial code ANSYS FLUENT. The species transport model and the discrete phase model are applied to simulate the multiphase flow and heat transfer process. The turbulence effect is included. The effects of flow rate, nozzle pressure, nozzle angle, and the nozzle orifice size on spray cooling are investigated through analyzing the final surface temperature distributions. This work revealed the mechanism of the heat transfer process in FESC by means of particle tracks and velocity magnitude distribution. The simulated results for the effect of flow rate were compared with other researchers’ previous published experimental results. The comparison shows same trend, which verified the model and the simulation result. The optimum cooling performance is found by analyzing various working conditions. The results show that high flow rate, high nozzle pressure, small nozzle angle and small nozzle orifice can improve the FESC characteristics. The detailed mechanisms of these effects under various working conditions are also discussed. Under giving working conditions, the optimum cooling performance is obtained for the condition where mass flow rate of working fluid is 2L/min, the nozzle pressure is 100MPa, the nozzle angle is 15 degrees and the orifice size of the nozzle is 1mm.

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“…The realizable k-ε turbulence model of the second-order upwind scheme with the SIMPLE segregated algorithm method [36] is applied to solve the Reynolds-averaged Navier Stokes (RANS) equations. The realizable k-ε turbulence model [37,38] with scalable wall function is a starting method for turbulence analysis for more accuracy and better convergence characteristics [39,40] for calculating power and torque, apart from its coefficient values for a VAWT model.…”

Section: Selection Of Turbulence Modelmentioning

confidence: 99%

Design of Rotor Blades for Vertical Axis Wind Turbine with Wind Flow Modifier for Low Wind Profile Areas

Anthony¹,

Prasad

Kannadasan

et al. 2020

Sustainability

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This work focuses on the design and analysis of wind flow modifier (WFM) modeling of a vertical axis wind turbine (VAWT) for low wind profile urban areas. A simulation is carried out to examine the performance of an efficient low aspect ratio C-shaped rotor and a proposed involute-type rotor. Further, the WFM model is adapted with a stack of decreased diameter tubes from wind inlet to outlet. It accelerates the wind velocity, and its effectiveness is examined on the involute turbine. Numerical analysis is performed with a realizable K-ε model to monitor the rotor blade performance in the computational fluid dynamics (CFD) ANSYS Fluent software tool. This viscous model with an optimal three-blade rotor with 0.96 m2 rotor swept area is simulated between the turbine rotational speeds ranging from 50 to 250 rpm. The parameters, such as lift–drag coefficient, lift–drag forces, torque, power coefficient, and power at various turbine speeds, are observed. It results in a maximum power coefficient of 0.071 for the drag force rotor and 0.22 for the lift force involute rotor. Moreover, the proposed WFM with an involute rotor extensively improves the maximum power coefficient to an appreciable value of 0.397 at 5 m/s wind speed, and this facilitates efficient design in the low wind profile area.

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Three Dimensional CFD Simulations of A Wind Turbine Blade Section; Validation

Cited by 12 publications

References 14 publications

A comparative study of RANS-based turbulence models for an upscale wind turbine blade

A comparative study of RANS-based turbulence models for an upscale wind turbine blade

Numerical study of spray cooling with flash evaporation

Design of Rotor Blades for Vertical Axis Wind Turbine with Wind Flow Modifier for Low Wind Profile Areas

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