This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Aerodynamic Shape Improvement Based on Surface Pressure Gradients in the Stream-wise and the Transverse Directions
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 12, 2010 by SAE International in United States
Annotation ability available
Aerodynamic forces are the result of various complex viscous flow phenomena such as three-dimensional turbulent boundary layer on the body surfaces, longitudinal vortices induced by three-dimensional boundary layer separation, and high turbulence caused by flow separations. Understanding the flow characteristics and, especially, how the aerodynamic forces are influenced by the changes in the vehicle body shape, are very important in order to improve vehicle aerodynamics (particularly for low drag shapes). The present study was an attempt to provide insights for better understanding of the complex three-dimensional flow field around a vehicle by observing the limiting surface streamlines and the surface pressure gradients in the stream-wise and the transverse directions. The main objective of this work is to provide a comprehensive diagnostic analysis of the basic flow features in order to learn more about the flow separations in three-dimensions. In addition, we would like to identify the flow structures due to the vehicle shapes which lead to surface pressure recovery. The availability of a reliable diagnostic tool will greatly improve the design iterations and aerodynamic development costs.
CitationHan, T. and Kim, Y., "Aerodynamic Shape Improvement Based on Surface Pressure Gradients in the Stream-wise and the Transverse Directions," SAE Technical Paper 2010-01-0511, 2010, https://doi.org/10.4271/2010-01-0511.
- Nash, J. F. and Patel, V. C., “Three-Dimensional Turbulent Boundary Layers”, SBC Technical Books, 1972.
- Peak, D. J., Rainbird, W. J., and Atraghji, E. G., “Three-Dimensional Flow Separations on Aircraft and Missiles”, AIAA Journal, Vol. 10, No. 5, pp. 567-580, 1972.
- Han, T. and Patel, V. C. “Flow Separation on a Spheroid at Incidence,” Journal of Fluid Mechanics, Vol. 92, Part 4, PP. 643-657, 1979.
- Lighthill, M. J., “Laminar Boundary Layers”, Edited by Rosenhead L., Oxford University Press, Oxford, England, 1963.
- Maskell, E. C., “Flow Separation in Three-Dimensions”, RAE Report Aero 2565, Royal Aircraft Establishment, Bedford, England, 1955.
- Wang, K. C., “Separation Patterns of Boundary Layer Over an Inclined Body of Revolution”, AIAA Journal, Vol. 10, No. 8, pp. 1044-1050, 1972.
- Smith, J. H. R., “A Review of Separation in Steady Three-Dimensional Flow”, AGARD-CP-No. 168 on Flow Separation, Session III-31, 1975.
- Fluent 6.3.33, Commercial CFD code, ANSYS Inc.
- EnSight Gold 8.2.5, Commercial CFD post-processing coed, Computational Engineering International, Inc.
- Khalighi, B., Johnson, J. P., Karbon, K. J., and Chang, F., “An external aerodynamic study using various CFD codes - benchmark comparison with experiments”, VAD-48, March 30, 2001.
- MORPHER, Mesh generation software, Detroit Engineering Products.
- Singh, R., Private communication.