A Numerical Investigation on the Dynamic Stall of a Wind Turbine Section Using Different Turbulent Models
In this article, the flow behavior around a NACA 0012 airfoil which is oscillating with different Reynolds numbers and in various amplitudes has been investigated numerically. Numerical simulations have been performed with ANSYS software. First, the 2- D geometry has been studied in different Reynolds numbers and angles of attack with various numerical methods in its static condition. This analysis was to choose the best turbulent model and comparing the grids to have the optimum one for dynamic simulations. Because the analysis was to study the blades of wind turbines, the Reynolds numbers were not arbitrary. They were in the range of 9.71e5 to 22.65e5. The angle of attack was in the range of -41.81° to 41.81°. By choosing the forward wind speed as the independent parameter, the others like Reynolds and the amplitude of the oscillation would be known automatically. The results show that the SST turbulent model is the best choice that leads the least numerical error with respect the experimental ones. Also, a dynamic stall phenomenon is more probable at lower wind speeds in which the lift force is less.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1084752Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1699
 McAlister, K.W. & Carr, L.W., "Water Tunnel Visualization of Dynamic Stall", in Nonsteady Fluid Mechanics, ed. Crow, D.E. &Miller, J.A., 103-110, 1978.
 McCroskey W.J., "Unsteady Airfoils" Ann. Rev. of Fluid Mech., vol. 14, 285-311, 1982.
 Gad-el-Hak, M. & Ho, C.M., "Unsteady Vortical Flow around Threedimensional Lifting Surfaces", to appear AIAA J., 1985.
 Carta, F.O., "A Comparison of the Pitching and Plunging Response of an Oscillating Airfoil", NASA CR-3172, 1979.
 Chen, S.H., "The Unsteady Aerodynamics of a plunging Airfoil", Ph.D. Thesis, University of Southern California, Los Angeles, California,1985.
 P.B. Martin & K.W. McAlister & M. S. Chandrasekhara & W. Geissler, "Dynamic Stall Measurements and Computations for a VR-12 Airfoil with a Variable Droop Leading Edge".
 ANSYS software, User Manual, 2007.