Computation of Two-dimensional Wind Turbine Airfoil Characteristics Using Advanced Turbulence and Transition Modeling Methods and a GPU-Accelerated Navier-Stokes Solver

2014 ◽  
Author(s):  
Taylor Reinhart ◽  
Shivaji Medida ◽  
Sebastian Thomas ◽  
James D. Baeder
Keyword(s):  
Wind Turbine ◽  
Navier Stokes ◽  
Two Dimensional ◽  
Modeling Methods ◽  
Wind Turbine Airfoil ◽  
Transition Modeling

Aerodynamic Analysis of an Airfoil With Leading Edge Pitting Erosion

2017 ◽  
Vol 139 (6) ◽  
Author(s):  
Yan Wang ◽  
Ruifeng Hu ◽  
Xiaojing Zheng
Keyword(s):  
Wind Turbine ◽  
Indirect Effects ◽  
Leading Edge ◽  
Aerodynamic Performance ◽  
Navier Stokes ◽  
Distribution Area ◽  
Navier Stokes Equation ◽  
Turbine Performance ◽  
Wind Turbine Airfoil ◽  
Cfd Method

Leading edge erosion is a considerable threat to wind turbine performance and blade maintenance, and it is very imperative to accurately predict the influence of various degrees of erosion on wind turbine performance. In the present study, an attempt to investigate the effects of leading edge erosion on the aerodynamics of wind turbine airfoil is undertaken by using computational fluid dynamics (CFD) method. A new pitting erosion model is proposed and semicircle cavities were used to represent the erosion pits in the simulation. Two-dimensional incompressible Reynolds-averaged Navier–Stokes equation and shear stress transport (SST) k–ω turbulence model are adopted to compute the aerodynamics of a S809 airfoil with leading edge pitting erosions, where the influences of pits depth, densities, distribution area, and locations are considered. The results indicate that pitting erosion has remarkably undesirable influences on the aerodynamic performance of the airfoil, and the critical pits depth, density, and distribution area degrade the airfoil aerodynamic performance mostly were obtained. In addition, the dominant parameters are determined by the correlation coefficient path analysis method, results showed that all parameters have non-negligible effects on the aerodynamics of S809 airfoil, and the Reynolds number is of the most important, followed by pits density, pits depth, and pits distribution area. Meanwhile, the direct and indirect effects of these factors are analyzed, and it is found that the indirect effects are very small and the parameters can be considered to be independent with each other.

scholarly journals Aerodynamic Sensitivity Analysis for a Wind Turbine Airfoil in an Air-Particle Two-Phase Flow

2019 ◽  
Vol 9 (18) ◽  
pp. 3909 ◽  
Author(s):  
Tongqing Guo ◽  
Junjun Jin ◽  
Zhiliang Lu ◽  
Di Zhou ◽  
Tongguang Wang
Keyword(s):  
Wind Turbine ◽  
Stokes Equations ◽  
Angle Of Attack ◽  
Performance Degradation ◽  
Navier Stokes ◽  
Discrete Phase Model ◽  
Two Phase ◽  
Naca0012 Airfoil ◽  
Particle Flows ◽  
Wind Turbine Airfoil

In this paper, the Navier-Stokes equations coupled with a Lagrangian discrete phase model are described to simulate the air-particle flows over the S809 airfoil of the Phase VI blade, the NH6MW25 airfoil of a 6 MW wind turbine blade and the NACA0012 airfoil. The simulation results demonstrate that, in an attached flow, the slight performance degradation is caused by the boundary layer momentum loss. After flow separation, the performance degradation becomes significant and is dominated by a more extensive separation due to particles, since the aerodynamic coefficient increments and the moving distance of separation point present similar variation trends with increasing angle of attack. Unlike the NACA0012 airfoil, a most particle-sensitive angle of attack is found in the light stall region for a wind turbine airfoil, at which the lift decrement and the drag increment reach their peak values. For the S809 airfoil, the most sensitive angle of attack is about 3° higher than that for the maximum lift-to-drag ratio. Hence, the aerodynamic performance of a wind turbine is very susceptible to particles. Based on the most sensitive angles of attack, the more sensitive scope of angles of attack of a blade airfoil and the more sensitive range of rotor tip speed ratios are predicted sequentially. The present study clarifies the principles for the performance degradation of a wind turbine airfoil due to particles and the conclusions are useful for the wind turbine design reducing the particle influences.

New Insight Into the Flow Around a Wind Turbine Airfoil Section1

2005 ◽  
Vol 127 (2) ◽  
pp. 214-222 ◽  
Author(s):  
F. Bertagnolio ◽  
N. N. Sørensen ◽  
F. Rasmussen
Keyword(s):  
Wind Turbine ◽  
Numerical Models ◽  
Turbine Blades ◽  
Three Dimensional ◽  
Unsteady Aerodynamics ◽  
Turbulence Models ◽  
Navier Stokes ◽  
Detached Eddy Simulation ◽  
Pitching Airfoil ◽  
Wind Turbine Airfoil

The objective of this paper is an improved understanding of the physics of the aeroelastic motion of wind turbine blades in order to improve the numerical models used for their design. Two- and three-dimensional Navier–Stokes calculations of the flow around a wind turbine airfoil using the k−ω SST and Detached Eddy Simulation (DES) turbulence models, as well as an engineering semiempirical dynamic stall model, are conducted. The computational results are compared to the experimental results that are available for both the static airfoil and the pitching airfoil. It is shown that the Navier–Stokes simulations can reproduce the main characteristic features of the flow. The DES model seems to be able to reproduce most of the details of the unsteady aerodynamics. Aerodynamic work computations indicate that a plunging motion of the airfoil can become unstable.

scholarly journals Two-dimensional numerical simulations of vortex-induced vibrations for wind turbine towers

2019 ◽  
Author(s):  
Axelle Viré ◽  
Adriaan Derksen ◽  
Mikko Folkersma ◽  
Kumayl Sarwar
Keyword(s):  
Numerical Simulations ◽  
Wind Turbine ◽  
Stokes Equations ◽  
Operating Conditions ◽  
Navier Stokes ◽  
Two Dimensional ◽  
Supercritical Regime ◽  
Vortex Induced Vibrations ◽  
Wind Turbine Towers ◽  
High Reynolds

Abstract. Vortex-induced vibrations (VIV) of wind turbine towers can be critical during the installation phase, when the rotor-nacelle assembly is not yet mounted on the tower. The present work uses numerical simulations to study VIV of a two-dimensional cylinder under conditions that are representative of wind turbine towers, both from a fluid-dynamics and structural-dynamics perspective. First, the numerical tools and fluid-structure interaction algorithm are verified by considering a cylinder vibrating freely in a laminar flow. In that case, both the motion amplitude and frequency are shown to agree well with previous results from the literature. Second, VIV is modelled in the turbulent supercritical regime using Unsteady Reynolds-Averaged Navier–Stokes equations. In this context, the turbulence model is first validated on flow past a stationary cylinder at high Reynolds number. Then, results from forced vibrations are validated against experimental results for a range of reduced frequencies and velocities. It is shown that the behaviour of the aerodynamic damping changes with the frequency ratio, and can therefore lead to either self-limiting or self-exciting VIV when the cylinder is left to freely vibrate. Finally, results are shown for a freely-vibrating cylinder under realistic flow and structural conditions. While a clear lock-in map is identified and shows good agreement with published numerical and experimental data, the work also highlights the unsteady nature of the aerodynamic forces and motion under certain operating conditions.

Horizontal Axis Wind Turbine Numerical Simulation of Two Dimensional Angle of Attack

2012 ◽  
Vol 619 ◽  
pp. 111-114
Author(s):  
Jing Mei Yu ◽  
Yan Hong Yu ◽  
Pan Pan Liu
Keyword(s):  
Numerical Simulation ◽  
Wind Turbine ◽  
Hot Spot ◽  
The United States ◽  
Aerodynamic Performance ◽  
Horizontal Axis ◽  
Energy Utilization ◽  
Two Dimensional ◽  
Horizontal Axis Wind Turbine ◽  
Wind Turbine Airfoil

wind power is the most effective form of wind energy utilization, modern large-scale wind turbine with horizontal axis wind mainly. Horizontal axis wind turbine aerodynamic performance calculation of the wind turbine aerodynamics research hot spot, is a wind turbine aerodynamic optimization design and calculation of critical load. Horizontal axis wind turbine airfoil aerodynamic performance of the wind turbine operation characteristics and life plays a decisive role". Using Fluent software on the horizontal axis wind turbine numerical simulation, analysis of the United States of America S809NREL airfoil aerodynamic characteristics of different angles of attack numerical simulation, analyzes the different angles of attack in the vicinity of the pressure, velocity distribution. By solving the two-dimensional unsteady, compressible N-S equations for the calculation of wind turbine airfoil S809used the characteristics of flow around. N-S equation in body-fitted coordinate system is given, with the Poisson equation method to generate the C grid.

The Actuator Surface Model: A New Navier–Stokes Based Model for Rotor Computations

2009 ◽  
Vol 131 (1) ◽  
Author(s):  
Wen Zhong Shen ◽  
Jian Hui Zhang ◽  
Jens Nørkær Sørensen
Keyword(s):  
Wind Turbine ◽  
Numerical Technique ◽  
Angle Of Attack ◽  
Vertical Axis ◽  
Navier Stokes ◽  
Surface Model ◽  
Two Dimensional ◽  
Vertical Axis Wind Turbine ◽  
Flow Past ◽  
Surface Technique

This paper presents a new numerical technique for simulating two-dimensional wind turbine flow. The method, denoted as the 2D actuator surface technique, consists of a two-dimensional Navier–Stokes solver in which the pressure distribution is represented by body forces that are distributed along the chord of the airfoils. The distribution of body force is determined from a set of predefined functions that depend on angle of attack and airfoil shape. The predefined functions are curve fitted using pressure distributions obtained either from viscous-inviscid interactive codes or from full Navier–Stokes simulations. The actuator surface technique is evaluated by computing the two-dimensional flow past a NACA 0015 airfoil at a Reynolds number of 106 and an angle of attack of 10deg and by comparing the computed streamlines with the results from a traditional Reynolds-averaged Navier–Stokes computation. In the last part, the actuator surface technique is applied to compute the flow past a two-bladed vertical axis wind turbine equipped with NACA 0012 airfoils. Comparisons with experimental data show an encouraging performance of the method.

Two-Dimensional Large-Eddy Simulation of Flow past a Wind Turbine Airfoil in Deep Fall

2011 ◽  
Vol 347-353 ◽  
pp. 2165-2168 ◽  
Author(s):  
Jie Fu ◽  
Bin He ◽  
Hui Ling Zhang ◽  
Qin Shan Fan
Keyword(s):  
Large Eddy Simulation ◽  
Wind Turbine ◽  
3D Model ◽  
Hybrid Methods ◽  
Separated Flows ◽  
Two Dimensional ◽  
Eddy Simulation ◽  
Flow Past ◽  
Large Eddy ◽  
Wind Turbine Airfoil

In order to assess the performance of the two-dimensional (2D) large eddy simulation (LES) as a computational tool for analyzing separated flows. LES in various models has been developed to simulate turbulent flows, especially to separated flows. In this investigation, 2D LES is used to simulate flow past a wind turbine airfoil in deep stall which is a classical separated flow proved by experiments. The results of 2D LES are compared with that of a 3D model using RNS/LES hybrid methods and with experimental data. This shows that the 2D LES method can not only be used to simulate separated flows, but also the calculation time of 2D LES is significantly decreased to compare with the 3D model using RNS/LES hybrid methods.

scholarly journals The Effects of Different Roughness Configurations on Aerodynamic Performance of Wind Turbine Airfoil and Blade

2017 ◽  
Vol 6 (3) ◽  
pp. 273 ◽  
Author(s):  
Kamyar Jafari ◽  
Mohammad Hassan Djavareshkian ◽  
Behzad Forouzi Feshalami
Keyword(s):  
Wind Turbine ◽  
Stokes Equations ◽  
Lift Coefficient ◽  
Simple Algorithm ◽  
Suction Side ◽  
Aerodynamic Performance ◽  
Navier Stokes ◽  
Pressure Side ◽  
Pressure Surface ◽  
Wind Turbine Airfoil

 In this research, viscous and turbulent flow is simulated numerically on an E387 airfoil as well as on a turbine blade. The main objective of this paper is to investigate various configurations of roughness to find a solution in order to mitigate roughness destructive impacts. Hence, the sand grain roughness is distributed uniformly along pressure side, suction side and both sides during the manufacturing process. Navier-Stokes equations are discretized by the finite volume method and are solved by SIMPLE algorithm. Results indicated that in contrast with previous studies, the roughness will be useful if it is applied on only pressure side of the airfoil. In this condition, the lift coefficient is increased to  and 1.2% compare to the airfoil with rough and smooth sides, respectively. However, in 3-D simulation, the lift coefficient of the blade with pressure surface roughness is less than smooth blade, but still its destructive impacts are much less than of both surfaces roughness and suction surfaces roughness. Therefore, it can be deduced that in order to reveal the influence of roughness, the simulation must be accomplished in three dimensions.Article History: Received Jun 12th 2017; Received in revised form August 27th 2017; Accepted Oct 3rd 2017; Available onlineHow to Cite This Article: Jafari, K., Djavareshkian, M.H., Feshalami, B.H. (2017) The Effects of Different Roughness Configurations on Aerodynamic Performance of Wind Turbine Airfoil and Blade. International Journal of Renewable Energy Develeopment, 6(3), 273-281.https://doi.org/10.14710/ijred.6.3.273-281

Applications of a Coupled Methodology to the Wind Turbine Airfoils

2012 ◽  
Vol 516-517 ◽  
pp. 572-576
Author(s):  
Qing Yuan Chen ◽  
Feng Lin Guo ◽  
Jin Quan Xu
Keyword(s):  
Wind Turbine ◽  
Turbulence Models ◽  
Navier Stokes ◽  
Far Field ◽  
Two Dimensional ◽  
Aerodynamic Coefficients ◽  
Free Vortex ◽  
Vortex Model ◽  
Wind Tunnel Data ◽  
Turbine Airfoils

In this study, a coupled methodology is proposed for the aerodynamic behavior of wind turbine airfoils. The idea is to combine a Navier-Stokes solver with a free vortex model. The zone for the calculation of CFD is confined to the surrounding of the airfoil, whilst the free vortex model accounts for the far field of the airfoil. The flow around the airfoil is assumed to be two-dimensional (2D) incompressible fully turbulent flow, which is modeled by two equation turbulence models. The computed aerodynamic coefficients are presented for two wind turbine airfoils and compared with wind tunnel data.

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