Publication Date


Document Type


Committee Members

Ha-rok Bae (Committee Member), Joseph Shang (Committee Member), Zifeng Yang (Advisor)

Degree Name

Master of Science in Engineering (MSEgr)


With the inspiration of owl's silent flight, a traditional airfoil S833 equipped with flexible fringes on the trailing edge is investigated through numerical simulation and experiments in a wind tunnel. The newly constructed airfoil is modeled and numerically investigated. An incompressible, 2D and viscous flow solver in the Computational Fluid Dynamics (CFD) software FLUENT is utilized to conduct the numerical simulation on the vortex flow feature in the wake of the airfoil. A User Defined Function code was applied to generate the defined motion of flexible fringes. The effects of the flapping frequency of the fringe and the deformation pattern of the fringe are investigated in the parametric study. On the other hand, the airfoil model with the flexible fringe is manufactured for the experimental study. A digital Particle Image Velocimetry (PIV) system is employed to investigate the flow structure in the wake and the deformation of the flexible fringes. The motion of the trailing edge fringes is extracted from the experimental measurements as the input for CFD simulation. It has been found that the addition of the flexible fringe has a significant effect on the flow characteristics in the vortex wake downstream of the airfoil as well as the aerodynamic performance of the airfoil.

Page Count


Department or Program

Department of Mechanical and Materials Engineering

Year Degree Awarded