Smart Spoiler for Race Car

Authors: M.H. Djavareshkian, A. Esmaeli

Abstract:

A pressure-based implicit procedure to solve Navier- Stokes equations on a nonorthogonal mesh with collocated finite volume formulation is used to simulate flow around the smart and conventional flaps of spoiler under the ground effect. Cantilever beam with uniformly varying load with roller support at the free end is considered for smart flaps. The boundedness criteria for this procedure are determined from a Normalized Variable diagram (NVD) scheme. The procedure incorporates es the k -ε eddyviscosity turbulence model. The method is first validated against experimental data. Then, the algorithm is applied for turbulent aerodynamic flows around a spoiler section with smart and conventional flaps for different attack angle, flap angle and ground clearance where the results of two flaps are compared.

Keywords: Smart spoiler, Ground Effect, Flap, Aerodynamic coefficients, Race car.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1072523

References:

[1] J. Zerihan and X. Zhang, "Aerodynamics of Gurney Flaps on a Wing in Ground Effect," AIAA journal, vol. 39, pp. 772-780, 2001.
[2] D. Ueno, G. Hu, I. Komada, K. Otaki, and Q. Fan, "CFD Analysis in Research and Development of Racing Car," presented at the Motorsports Engineering Conference & Exposition, Dearborn, MI, USA, 2006.
[3] K. Goto and H. Sakurai, "Numerical Study for the Optimal Flap Chord Length of a Two-Element Airfoil," SAE International Journal of Passenger Cars-Mechanical Systems, pp. 1-3643, 2006.
[4] J. Reddy and M. Gupta, "Finding the Optimum Angle of Attack for the Front Wing of an F1 Car Using CFD," in 4th WSEAS International Conference on Fluid Mechanics and Aerodynamics, Elounda, Greece, 2006, pp. 29-34.
[5] J. Katz, "Aerodynamics of Race Cars," Annual Review of Fluid Mechanics, vol. 38, p. 27, 2005.
[6] W. Mokhtar, "A Numerical Study of High-Lift Single Element Airfoils with Ground Effect for Racing Cars," SAE transactions, vol. 114, pp. 682-688, 2005.
[7] W. Mokhtar, "Aerodynamics of High-Lift Wings with Ground Effect for Racecars," presented at the SAE World Congress, 2008.
[8] W. Mokhtar and J. Lane, "Racecar Front Wing Aerodynamics," SAE International Journal of Passenger Cars-Mechanical Systems, vol. 1, p. 1392, 2009.
[9] J. Zerihan and Z. Xin, "Aerodynamics of a Single Element Wing in Ground Effect," Journal of aircraft, vol. 37, pp. 1058-1064, 2000.
[10] M. Ahmed, S. H. Ali, G. M. Imran, and S. D. Sharma, "Experimental Investigation of the Flow Field of a Symmetrical Airfoil in Ground Effect," in 21st Applied Aerodynamics Conference, Orlando, Florida, 2003.
[11] M. Ahmed and S. Sharma, "An Investigation on the Aerodynamics of a Symmetrical Airfoil in Ground Effect," Experimental Thermal and Fluid Science, vol. 29, pp. 633-647, 2005.
[12] K. Jung, H. Chun, and H. Kim, "Experimental Investigation of Wingin- Ground Effect with a NACA6409 Section," Journal of marine science and technology, vol. 13, pp. 317-327, 2008.
[13] J. Smith, "Computational Analysis of Airfoils in Ground Effect for Use as a Design Tool," M.Sc Mechanical and Aerospace Engineering Department, West Virginia University, West Virginia, 2007.
[14] K. Park and J. Lee, "Influence of Endplate on Aerodynamic Characteristics of Low-Aspect-Ratio Wing in Ground Effect," Journal of mechanical science and technology, vol. 22, pp. 2578-2589, 2008.
[15] J. P. Boschetti, M. E. Cárdenas, and A. AmerioCLq, "Stability and Performance of a Light Unmanned Airplane in Ground Effect," in 48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition, Florida, 2010.
[16] J. Lee, C. Hong, B. Kim, K. Park, and J. Ahn, "Optimization of Wings in Ground Effect Using Multi-Objective Genetic Algorithm," in 48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition, Florida, 2010.
[17] A. Bolonkin, G. Gilyard, H. L. D. F. R. Center, U. S. N. Aeronautics, and S. Administration, Estimated benefits of variable-geometry wing camber control for transport aircraft: Citeseer, 1999.
[18] N. J. Pern and J. D. Jacob, "Wake Vortex Mitigation using Adaptive Airfoils," presented at the 37th AIAA. Aerospace Sciences Meeting and Exhibit, 1999.
[19] J. Kudva, C. Martin, A. Jardine, G. Sendeckyj, T. Harris, A. McGowan, and R. Lake, "Design, Fabrication, and Testing of the DARPA/Wright Lab" Smart Wing" Wind Tunnel Model," Journal of American Institute of Aeronautics and Astronautics (AIAA), 1997.
[20] E. Forster, B. Sanders, and F. Eastep, "Synthesis of a Variable Geometry Trailing Edge Control Surface," AIAA paper, vol. 1717, 2003.
[21] M. Djavareshkian, "A new NVD Scheme in Pressure-Based Finite- Volume Methods," in 14th Australasian Fluid Mechanics conference, , Adelaide University, Adelaide, Australia, 2001, pp. 10-14.