A Numerical Investigation of NACA0025 Airfoil Boundary Layer separation using Large Eddy Simulations

摘要

A numerical investigation of an incompressible turbulent flow over a NACA0025 with an unsteady boundary layer seperation at a Reynolds number of 105 using Large eddy simulations is reported. Analyses of different vortex structures in the near field of the boundary layer have been performed. Vortex merger and the entrainment of roll-up vortex were found and yielded important hints to the related mechanisims of instability. The results are in excellent agreement with experimental data for both the pressure distribution and the power spectrum density of the velocity fluctuations.