Abstract: A numerical investigation is performed to study aerodynamics of a 2D NACA0012 wing and flows in ground effect (IGE). Lift and drag forces are obtained and pressure distribution on airfoil surfaces is recorded at different angles of attack and ground clearances. Viscous flow near ground and air compressibility are taken into account. High lift is obtained as the airfoil is in dose proximity to the ground. The stall angle decreases with reduction of the ground clearance, due to higher adverse pressure gradient. Viscous effect of floor shows less effect on airfoil. Compressibility should be taken into account at lower ground clearances.

Key words: wing in ground effect, aerodynamics, viscous effect, compressibility