A Comparative Study of Turbulence Models on Aerodynamics Characteristics of a NACA0012 Airfoil

Abstract

This paper presented a computational fluid dynamics (CFD) simulation of air flow past a 2D model NACA0012 airfoil at high Reynolds number (Re = 3.0 x 10 6 ) at various angles of attack (-10 to 15). The simulations were undertaken to inform on how the fluid flowed around the airfoil by solving the steady state governing equations of continuity and momentum conservation that are combined with one of three turbulence models Spalart-Allmaras, Realizable k-ε and k-ω shear stress transport (SST). It is observed that the Realizable k-ε eliminates the small separation bubble on the upper surface of the airfoil and delaying separation flow. Also, for the lift coefficient, CL and drag coefficient, CD investigated in this paper, the predicted data have good agreement with other published data.

Numerical and Experimental Investigation of NACA-0018 Wind Turbine Aerofoil Model Performance for Different Aspect Ratios

“…Farklı fiziksel olaylara göre geliştirilen cebirsel, tek denklemli, iki denklemli ve Reynolds gerilme modelleri bulunmaktadır [26]. Cisimler etrafındaki akışı modellemek için en yaygın kullanılan türbülans modelleri arasında Spalart Allmaras, k-ɛ, k-ω ve SST türbülans modelleri bulunmaktadır [22][23][24][25][26][27][28]. Tüm akışlar için belirli bir türbülans modeli belirlemek mümkün değildir.…”

“…Menter SST k-ω türbülans modeli, sınır tabakada içerisinde daha hassas çözüm elde etme için Wilcox k-ω modelinin yeniden değerlendirilmesi sonucu geliştirilmiştir [10]. İki denklemli olan Menter SST k-ω modeli aşağıdaki gibi ifade edilmiştir [10,[22][23][24][25][26][27][28]:…”

Review on Diffuser Augmented Wind Turbine (DAWT)

“…The conventional technique for improving wind turbine is by improving rotor blade design where the blade is the most important part of a wind turbine. As mentioned in section one, power improvement is achieved by increasing the coefficient of lift or reducing the drag coefficient where lift and drag forces rely mainly on blade geometry and attack angle and the lift force is considered most commonly associated with wind turbines [33]. Many studies have been conducted to increase the efficiency of the horizontal axis wind turbine (HAWT) by improving aerodynamic forces acting on the blade.…”

Asymptotic Computational Fluid Dynamic (ACFD) Study of Three-Dimensional Turning Diffuser Performance by Varying Angle of Turn

“…Each equation was solved separately in pressure-based solver. SIMPLE algorithm, a robust pressure-velocity coupling algorithm which combine the momentum equation and continuity equation that takes the form of pressure correction equation was applied [12,13]. The gradient was discretised by Green-Gauss-Cell based.…”