In order to investigate the effect of upper and lower surface corrugations on the aerodynamic forces respectively

the gliding aerodynamic characteristics of both surfaces of a corrugated airfoil were studied at chord Reynolds number of 1200 when the angle of attack (AOA) varied from 0° to 20° with the finite volume method

compared with the smooth airfoil

corrugated airfoil with the smooth upper surface and corrugated airfoil with the smooth lower surface. The computed results indicate that the lift coefficient of corrugated airfoil improves by 10% than that of smooth airfoil. Within a suitable AOA

the lift of an airfoil with corrugated lower surface is always higher than that of an airfoil with smooth lower surface. The corrugation of lower suface play more important role of increasing the lift. At high AOA

a smooth upper surface increases the lift than a corrugated one. The corrugation of both upper and lower surfaces has little effect on the drag.