Numerical Simulation of a Pitching Airfoil Under Dynamic Stall of Low Reynolds Number Flow

Abstract

In this research, viscous, unsteady and turbulent fluid flow is simulated numerically around a pitching NACA0012 airfoil in the dynamic stall area. The Navier-Stokes equations are discretized based on the finite volume method and are solved by the PIMPLE algorithm in the open source software, namely OpenFOAM. The SST k - ω model is used as the turbulence model for Low Reynolds Number flows in the order of 105. A homogenous dynamic mesh is used to reduce cell skewness of mesh to prevent non-physical oscillations in aerodynamic forces unlike previous studies. In this paper, the effects of Reynolds number, reduced frequency, oscillation amplitude and airfoil thickness on aerodynamic force coefficients and dynamic stall delay are investigated. These parameters have a significant impact on the maximum lift, drag, the ratio of aerodynamic forces and the location of dynamic stall. The most important parameters that affect the maximum lift to drag coefficient ratio and cause dynamic stall delaying are airfoil thickness and reduced frequency, respectively.

Wing Sails: Numerical Analysis of High-Performance Propulsion Systems for a Racing Yacht

“…Such an approach is also in line with the recommendations given in the solver documentation [16]. As for the shape of the domain, the U-or C-shaped domain is standard for simulations of flow around aerofoils, as proved by studies of [25,26] or [27]. As stated by Ferrari [28], this domain shape and meshing approach enables one to obtain a better quality of grid than, for example, H and O shapes.…”

“…As for the shape of the domain, the U-or C-shaped domain is standard for simulations of flow around aerofoils, as proved by studies of [25,26] or [27]. As stated by Ferrari [28], this domain shape and meshing approach enables one to obtain a better quality of grid than, for example, H and O shapes.…”

Stall Behavior Curved Planform Wing Analysis with Low Reynolds Number on Aerodynamic Performances of Wing Airfoil Eppler 562

“…UAV maneuvers that cause a combination of yawing, rolling, and pitching movements cannot be controlled perfectly so that the wings accidentally create extreme angles of attack that suddenly cause dynamic stalls. This is supported by the speed of the UAV which tends to use a low Reynolds number [15,16] and a low altitude which increases the tendency for accidents to occur. Therefore, in this study, we will discuss the pattern of stalls with a low Reynolds number to clarify stall behavior in maneuvering the use of UAVs.…”