TURBULENT FLOWS AROUND A NACA 0012 PROFILE INCLUDING STATIC AND DYNAMIC STALL

摘要

The general purpose CFD-code FLOTRAN (ANSYS) based on a finite element formulation was used to solve turbulent flows around the well known NACA 0012 profile. The computed flows were steady and unsteady, compressible and uncompressible at different conditions including dynamic stall. The mesh refinement influence on the results was carefully studied in order to optimize the computing time. Solutions are in all cases compared with experimental data available from several wind tunnels. Incompressible flows have been computed at a Reynolds number of Re = 2.4e + 6 and angles of attack 0°< α < 22°. Attached flow was obtained for angles α< 18° and separated unsteady flow for higher angles of attack. Several dynamic stall calculations were performed for the NACA 0012 profile at deep stall conditions. The flow has a Reynolds number of Re =4e+6, a Mach number of M∞= 0.3, a reduced frequency of k = 0.15 and an oscillating angle given by α(t) = 15°+ 5° sin(wt).