Iman Naghib - MSc Student
Mohammad Hasan Shojaei Fard - Professor
Pouria Ahmadi - MSc Student
Mostafa Nosrati - MSc Student

The effect of Gurney flaps has been studied for the range of application of racing cars. Both twodimensional and three-dimensional studies have been conducted, and several configurations and variations of trailing edge devices are investigated. Validation of the codes for a special Reynolds number has been performed. By utilization of quadratic meshes, low computation time has been achieved. Stationary 2D computations agree with experimental data in lift coefficient, which has been achieved by the use of PIV analysis. These results, accurate and low cost, make Gurney flaps application to racing cars, UAV's and wind turbine more feasible. More complex 3D configuration has been studied. With good results using meshes under 7 × 105 cells for three-dimensional complex configuration, which can be used in future works. All numerical results are compared to corresponding experimental results from the Open Return Wind Tunnel at University of Minnesota, Department of Aerospace Engineering in a quantitative manner. In order to the corresponding Reynolds number, a turbulent flow is to be solved. The turbulence model used for solving governing equations is Spalart- Allmaras model. In different flap configurations the lift coefficients are compared. The results show that a significant increase in lift is provided.

Gurney flap, Lift enhancement, NACA0015 Airfoil, Numerical analysis