抄録
Three-dimensional numerical simulation of the flow field around a NACA0012 airfoil at Reynolds number 10,000 was carried out to clarify three-dimensionalization process of the flow field around the airfoil at 7 degrees of angle of attack. The simulation results show a primary instability in a laminar separation bubble on the suction side which leads to subsequent nonlinear equilibrium. The feature of the most amplified velocity fluctuation was in good agreement with that predicted by the linear stability theory of free shear layer. The secondary instability begins near the end of the separation bubble which induces spanwise deformation of the boundary layer; thereby three-dimensionalization of the flow field breaks out.
