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Ground Effect of a Simplified Car Model in Side-Wind and Turbulent Flow
Technical Paper
1999-01-0652
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Aerodynamics of modern cars is usually investigated in condition of very low turbulence flow and zero yaw. Furthermore, the majority of the tests are often carried out in wind tunnels with fixed ground and static wheels.
The effects of a more realistic flow simulation on the car underbody produced by the ground motion and the wheel rotation have been reported in the SAE paper 980031 presented at the 1998 Int’I SAE Congress.
This parametric study was carried out in the Pininfarina wind tunnel, by using the Ground Effect Simulation System (“GESS”) built in 1995 and a full-scale simplified car model.
This paper reports the follow up of this investigation. The same simplified car model and its underbody interchangeable underbody parts has been tested again, using the “GESS”. However, in the second test session:
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the model has been tested at yaw angles from 0 to -25 degrees, and
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a non-uniform velocity profile and a relatively high turbulence flow have been generated in order to simulate the presence of a side wind.
Results of these tests are then compared with those measured in the past, in condition of uniform velocity and low-turbulence flow.
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Citation
Cogotti, A., "Ground Effect of a Simplified Car Model in Side-Wind and Turbulent Flow," SAE Technical Paper 1999-01-0652, 1999, https://doi.org/10.4271/1999-01-0652.Also In
References
- Cogotti, A. Ground Effect Simulation for full-scale Cars in the Pininfarina Wind Tunnel CNR-Pininfarina Workshop on Wind Tunnel Simulation on Ground Effect Turin May 1994
- Cogotti, A. Ground Effect Simulation for full-scale Cars in the Pininfarina Wind Tunnel SAE paper 960996 , IntI’ SAE Congress Detroit February 1995
- Cogotti, A. Sistema Integrato alla bilancia aerodinamica per Io studio dell’effetto suolo in galleria 1:1 CNR - III Convegno Nazionale PFT2 Taormina Novembre 1997
- Cogotti, A. “A Parametric Study on the Ground Effect of a Simplified Car Model SAE paper 980031 , IntI’ SAE Congress Detroit February 1998
- Saunders, J. Watkins, S. Melbourne, W.H. Moving Closer to Correct Simulation for Car Aerodynamics in the Wind-Tunnel SAE paper 950997 , IntI’ SAE Congress Detroit February 1995
- Watkins, S. Lin, C. Saunders, J.W. Prediction of the Effect of Cross-Winds on Motor Car Engine Cooling in a Wind Tunnel SAE paper 970138 , Int’I SAE Congress Detroit February 1997
- Nguyen, T. M. Saunders, J. W. Watkins, S. The Sideways Dynamic Force on Passenger Cars in Turbulent Winds SAE paper 970405 , IntI’ SAE Congress Detroit February 1997
- Macklin, R. Garry, K.P. Howell, J. Dynamic Testing of a Car Model in a Crosswind - The Effects of Shear and Turbulence SAE paper 970135 , IntI’ SAE Congress Detroit February 1997
- Sims-Williams, D. B. Dominy, R.G. Experimental Investigation into Unsteadiness and Instability in Passenger Car Aerodynamics SAE paper 980391 , IntI’ SAE Congress Detroit February 1998
- Ryan, A. Dominyi, R. G. The Aerodynamic Forces induced on a Passenger Vehicle in Response to a Transient Cross-Wind Gust SAE paper 980392 , IntI’ SAE Congress Detroit February 1998
- Peric, C. Watkins, S. Lindqvist, E. Saunders, J.W. Effects of On-Road Turbulence on Automotive Wind Noise: Comparing Wind-Tunnel and On-Road Tests SAE paper 970406 , IntI’ SAE Congress Detroit February 1997
- Buckley, F. T. ABCD - An Improved Coast-Down Test and Analysis Method SAE paper 950626 , IntI’ SAE Congress Detroit February 1995
- Le Good, G.M. Howell, J.P. Passmore, M.A. On-Road Aerodynamic Drag Measurements, Compared with Wind Tunnel Data SAE paper 950627 , IntI’ SAE Congress Detroit February 1995
- Le Good, G.M. Howell, J.P. Passmore, M.A. Cogotti, A. A Comparison of On-Road Aerodynamic Drag Measurements with Wind Tunnel Data from Pininfarina and MIRA SAE paper 980394 , IntI’ SAE Congress Detroit February 1998
- Okumura, K. Kuriyama, T. Transient Aerodynamic Simulation in Crosswind and Passing an Automobile SAE paper 970404 , IntI’ SAE Congress Detroit February 1997
- Goetz H. et al., Crosswind Facilities and Procedures SAE SP 1109, by the “Crosswind Facilities and Procedures Standards Committee” 1995
- Cogotti, A. Prospects for Aerodynamic Research in the Pininfarina Wind Tunnel FISITA paper 905149, XXIII FISITA Congress Torino May 1990
- Cooper, K.R. The wind tunnel simulation of wind turbulence for surface vehicle testing Aachen 1989
- Howell, J.P. Shape features which influence crosswind sensitivity C466/036/93, ImechE 1993, Ride and Handling Conference