Transition prediction for a two dimensional Navier-Stokes solver applied to wind-turbine airfoils

2000 ◽  
Author(s):  
Robert Brodeur ◽  
C. van Dam
Keyword(s):  
Wind Turbine ◽  
Navier Stokes ◽  
Two Dimensional ◽  
Transition Prediction ◽  
Turbine Airfoils

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.

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.

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.

scholarly journals Two-dimensional numerical simulations of vortex-induced vibrations for a cylinder in conditions representative of wind turbine towers

2020 ◽  
Vol 5 (2) ◽  
pp. 793-806
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 (VIVs) 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 VIVs of a two-dimensional cylinder in the transverse direction under flow 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 validated 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, VIVs are modelled in the turbulent supercritical regime using unsteady Reynolds-averaged Navier–Stokes equations. In this context, the turbulence model is first validated against flow past a stationary cylinder with a high Reynolds number. Then, the 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 VIVs 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.

scholarly journals Numerical simulation of aerodynamic performance for two dimensional wind turbine airfoils

2012 ◽  
Vol 31 ◽  
pp. 80-86 ◽  
Author(s):  
Ji Yao ◽  
Weibin Yuan ◽  
jianliang Wang ◽  
Jianbin Xie ◽  
Haipeng Zhou ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Wind Turbine ◽  
Aerodynamic Performance ◽  
Two Dimensional ◽  
Turbine Airfoils
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