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The Unsteady Wind Environment of Road Vehicles, Part One: A Review of the On-road Turbulent Wind Environment
Technical Paper
2007-01-1236
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
This paper is the first of two papers that address the simulation and effects of turbulence on surface vehicle aerodynamics. This, the first paper, focuses on the characteristics of the turbulent flow field encountered by a road vehicle. The natural wind environment is usually unsteady but is almost universally replaced by a smooth flow in both wind tunnel and computational domains. In this paper, the characteristics of turbulence in the relative-velocity co-ordinate system of a moving ground vehicle are reviewed, drawing on work from Wind Engineering experience. Data are provided on typical turbulence levels, probability density functions and velocity spectra to which vehicles are exposed. The focus is on atmospheric turbulence, however the transient flow field from the wakes of other road vehicles and roadside objects are also considered. The effects of turbulence on vehicle aerodynamics and methods of experimental simulation are reviewed in a companion paper, Part 2 (Watkins and Cooper, 2007).
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Authors
Topic
Citation
Cooper, K. and Watkins, S., "The Unsteady Wind Environment of Road Vehicles, Part One: A Review of the On-road Turbulent Wind Environment," SAE Technical Paper 2007-01-1236, 2007, https://doi.org/10.4271/2007-01-1236.Also In
SAE 2007 Transactions Journal of Passenger Cars: Mechanical Systems
Number: V116-6; Published: 2008-08-15
Number: V116-6; Published: 2008-08-15
References
- Texas Tech. University http://www.wind.ttu.edu/windenergy/FieldData/FieldData01.htm
- Balzer L. A. “Atmospheric Turbulence Encountered by High-Speed Ground Transport Vehicles” J. Mech. Eng. Sci. 19 1977
- Bearman P. W. Morel T. “Effect of Free Stream Turbulence on the Flow Around Bluff Bodies” Progress in Aerospace Sciences 20 97 123 1983
- Bearman P. W. “An Investigation of the Forces on Flat Plates Normal to a Turbulent Flow” J. Fluid Mech. 46 177 198 1971
- Bearman P. W. “Some Effects of Free-Stream Turbulence and the Presence of the Ground on the Flow around Bluff Bodies” Aero Drag Mechanisms of Bluff Bodies and Road Vehicles Sovran G. Morel T. Mason W.T. Plenum Press 1978
- Buckley F. T. Jr. marks C. H. Walston W.H. Jr “A Study of Aerodynamic Methods for Evaluating Truck Fuel Economy” Prepared for the National science Foundation University of Maryland USA Dec. 1978
- Cogotti A. “The Evolution of the Testing Environment in the Pininfarina Wind Tunnel: The New Turbulence Generation System” Proceedings of BBAA 5 2003
- Cogotti A. “Update on the Pininfarina “Turbulence Generation System” and its effects on the car Aerodynamics and Aeroacoustics” SAE 2004-01-0807
- Cogotti, A. “Aerodynamics and Aeroacoustics of Passenger Cars in a Controlled High Turbulence Flow: Some New Results” SAE 2005-01-1445
- Cook, N., J. “The Designers Guide to Wind Loading of Building Structures” London BRE and Butterworths 1990
- Cooper K. R. Campbell W.F. “An Examination of the Effects of Wind Turbulence on the Aerodynamic Drag of vehicles” J. Wind Eng. and Ind. Aerodyn. 9 1981
- Cooper K. R. “The Effect of Front-Edge Rounding and Rear-Edge Shaping on the Aerodynamic Drag of Bluff Vehicles in Ground Proximity” SAE 850288 SAE Transactions 2.727 2.757 1986
- Cooper K. R. “The Wind Tunnel Simulation of Wind Turbulence for Surface Vehicle Testing” in proc of 8 th Colloquium on Industrial Aerodynamics Aachen Sept. 4-7th 1989
- Cooper K. R. “The Wind-Tunnel Simulation of Surface Vehicles” J. Wind Eng. and Ind. Aerodyn. 17 1984
- Cooper R. K. Atmospheric Turbulence with Respect to Ground Vehicles” J. Wind Eng. and Ind. Aerodyn. 17 1984
- Cooper, K.R. SAE Wind Tunnel Test Procedure for Trucks and Buses SAE Recommended Practice J1252 Aug. 1979
- Davenport A.G. “The Spectrum of Horizontal Gustiness Near the Ground in High Winds” Quat. J. Roy. Met. Soc. 87 194 211 1961
- Engineering Sciences Data Units Strong Winds in the Atmospheric Boundary Layer
- ESDU Characteristics of atmospheric turbulence near the ground: Part 1, 74030, Part 2, 74031, Part 3 75001 1976
- ESDU Characteristics of atmospheric turbulence near the ground: Part 2, 85020 1985
- ESDU Characteristics of atmospheric turbulence near the ground: Part 3, 86010 1985
- Flay R. G. J. Locke N. J. Mallinson G. D. “Model tests of twisted flow wind tunnel designs for testing yacht sails” J. Wind Eng. and Ind. Aerodyn. Volume 63 Issues 1-3 October 1996 Pages 155 169
- Flay, R.G.L. Structure of a Rural Atmospheric Boundary Layer Near the Ground Dept. of Mech. Eng., University of Canterbury New Zealand 1978
- Gad-el-Hak M. Corrsin S. “Measurements Of The Nearly Isotropic Turbulence Behind a Uniform Jet Grid” J. Fluid Mech. 62 1 115 143 1974
- Garry K.P. Cooper K. R. “Comparison of Quasi-Static and Dynamic Wind Tunnel Measurements on Simplified Tractor-Trailer Models” J. Wind Eng and Ind. Aero. 22 1986
- Garry K.P. “Wind Tunnel Techniques for Reducing Commercial Vehicle Aerodynamic Drag” Cranfield College of Aeronautics Report 8220 Sept 1982
- George A.R. Callister J. R. “Aerodynamic Noise of Ground Vehicles” SAE Paper 911027
- Gosman A. D. “Developments in CFD for industrial and environmental applications in wind engineering” Journal of Wind Engineering and Industrial Aerodynamics Volume 81 Issues 1-3 May 1999 Pages 21 39
- Holmes, J.D. Wind loading of structures Spon Press 2001
- Real Howell J. Environment for Vehicles on the Road Euromotor 2000 FKFS Stuttgart
- Howell J.P Everitt K.W. Gust Response of a High Speed Train Model ASME Conference FED-7, Aerodynamics of Transportation Boston 1983
- Hucho, W-H. et al. Aerodynamics of Road Vehicles Fourth 1998
- Hunt, J.C.R. Carruthers, D.J. J. “Rapid distortion theory and the ‘problems’ of turbulence” J. Fluid Mech. 212 497
- Lappe, V.V. Davidson, B. On the Range and Validity of Taylor's Hypothesis and the Kolmogroroff Spectral Law J.Atmost.Sci. 20 569 576 1963
- Lawson, T.V. Wind Effects on Buildings Applied Science Publishers Ltd 1980
- Lin C. Saunders J. W. Watkins S. “Effect of Cross-Winds on Motor Car Engine Cooling” SAE 970138
- Lumley J.L. Panofsky H.A. “The Structure of Atmospheric Turbulence” John Wiley and Sons 1984
- Macklin A.R. Garry K.P. Howell J.P. Assessing the Effects of Shear and Turbulence during the Dynamic Testing of the Crosswind Sensitivity of Road Vehicles SAE 970135 1997
- Milliken W. F. “Aerodynamic Research Plan for Automotive Type Vehicles” Milliken research Associates 1977
- Mousley, P.D. Watkins, S. 2000 A Method of Flow Measurement About Full-Scale and Model-Scale Vehicles Society of Automotive Engineers SAE 2000-01-0871
- Mousley, P.D. Watkins, S. O'Shea, P. 2001 Modulation of In-Cabin Car Wind Noise by Atmospheric Winds 8th International Congress on Sound and Vibration Hong Kong 2-5 July 2001
- Murakami S. “Overview of turbulence models applied in CWE-1997” J. Wind Eng. and Ind. Aerodyn. Volumes 74-76 1 April 1998 Pages 1 24
- Newnham P. S. Passmore M. A. Baxendale A. “An Experiment To Investigate The Influence of Free Stream Turbulence on Edge Radius Optimisation” 5th MIRA International Vehicle Aerodynamics Conference 2004
- Nguyen, T.M. Saunders, J.W. Watkins, S The Sideways Dynamic Force on Passenger Cars in Turbulent Winds Topics in Vehicle Aerodynamics 1-56091-944-2 SAE 157 172 1997
- Pagliarella, R. M. 2007
- Panofsky, H. A. Dutton, J.A. Atmospheric turbulence- Models and Methods for Engineering Applications John Wiley and Sons United States of America 1984
- Panofsky, H. A. “Scale of Atmospheric Turbulence at 2m” Quat. J. Roy. Met. Soc. 88 1962
- Panofsky, H.A. Cramer, H.E. Roa, V.R.K. The relationship between Eulerian Time and Space Spectra Quart. J. Roy. Met. Soc. 84 270 273 1958
- Peric, C. Watkins, S. Lindqvist, E. Saunders, J.W. 1997 Effects of On-Road Turbulence on Automotive Wind Noise: Comparing Wind-Tunnel and On-Road Tests SAE Paper 970406
- Powell, D.C. Elderkin, C.E. An investigation of the application of Taylor's Hypothesis to Atmospheric Boundary Layer turbulence J.Atmos.Sci 31 4 990 1002 1974
- Raupach M. R. Thom A. S. “Turbulence in and Above Plant Canopies” Ann. Rev. Fluid Mech. 1981
- Richards P. J. Hoxey R. P. Short J. L. “Spectral models for the neutral atmospheric surface layer” J.Wind Eng.Ind.Aerodyn. 87 2-3 167 185 2000
- Saunders J. W. Wordley S. “A Review of Measurement of Ambient Turbulence With Respect To Ground Vehicles” SAE 2006-01-1028
- Saunders J.W. Hoffmann Wind Tunnel Balance for Measuring the Six-Components of Aerodynamic Force and Moment Spectra on Vehicles XIX International FISITA Congress Melbourne Nov. 1982
- Saunders J.W. Mansour R.B. On-Road and Wind Tunnel Turbulence and its Measurements Using a Four-Hole Dynamic Probe ahead of Several Cars SAE Paper 2000-01-0350 2000
- Saunders J.W. Melbourne W.H. Buffeting Effects of Upstream Buildings Proc. 5th Int. Wind Engineering Conf. on Wind Effects on Buildings and Structures Fort Collins, Colorado Pergamon 1979
- Saunders J.W. The Importance of Simulating Turbulence in the Vehicle-Aerodynamics Wind Tunnel, Particularly for Simulation of Aero-Acoustic Noise Sub-Sonic Aeronautical Association Conference Haifa July 1996
- Saunders J.W. The Monash Wind Tunnel - Its Use for Automobile Aerodynamic Design and Noise SAE Australasia Aerodynamics Seminar Melbourne September 2003
- Saunders, J. W. Watkins, S. Melbourne, W. H. Monash/RMIT Vehicle Aero-acoustic Wind Tunnel: Turbulence for Car Aerodynamics Testing Proceedings Ninth International Pacific Conference on Automotive Engineering Indonesia SAE 971401 223 228 Nov. 1997
- Saunders, J.W. Mansour, R.B. 2000 On-Road and Wind Tunnel Turbulence and its Measurement Using a Four-Hole Dynamic Probe Ahead of Several Cars SAE Paper 2001-01-0350
- Saunders, J.W. Melbourne, W.H. Tall Rectangular Building Response to Cross-Wind Excitation Proc. 4th Int. Wind Engineering Conf. on Wind Effects on Buildings and Structures London Eaton K.J. Cambridge Univ. Press 369 379 1975
- Saunders, J.W. Watkins, S. Atmospheric Effects on the Crosswind Stability of Cars American SAE Information Monograph of the Crosswind Stability of Cars Goetz H. SAE SP-1109 1993
- Saunders, J.W. Car Door Seal Lift Off: Determining Appropriate Static And Dynamic Stiffness Using Surface Pressure In The Wind Tunnel And On-Road Sub-Sonic Aeronautical Association Conference Melbourne August 2002
- Saunders, J.W. Low Turbulence in SAE-standard Vehicle Aerodynamic Wind Tunnels under predicts Sideglass Pressures Sub-Sonic Aeronautical Association Conference Seattle June 2001
- Saunders, J.W. Watkins, S. Hoffmann, P.H. Buckley. F.T. Jr Comparison of On-Road and Wind-Tunnel Tests for Tractor-Trailer Aerodynamic Devices, and Fuel Savings Predictions SAE paper 850286 SAE Congress Detroit Feb. 1985 1985 SAE Transactions
- Smith N. P. “Wind Gusts Measured on High Speed Roads” Motor Industry Research Association Report UK 1972
- Society of Automotive Engineers 1994 Aerodynamic Testing of Road Vehicles - Open Throat Wind Tunnel Adjustment SAE J2071
- Sutton, O.G. Micrometeorology McGraw-Hill Books 1953
- Széchényi E. Crosswind and its Simulation Euromotor 2000 FKFS Stuttgart
- Takanori Uchida T. Yuji Ohya Y. “Large-eddy simulation of turbulent airflow over complex terrain” J. Wind Eng. and Ind. Aerodyn. 91 Issues 1-2 January 2003 Pages 219 229
- Taylor, G.I. Statistical Theory of Turbulence Proc. Roy. Soc. London 151 1935
- Teunissen, H.W. Characteristics of the Mean Wind and Turbulence in the Planetary Boundary Layer Institute for Aerospace Studies, UTIAS Review No. 32 1970
- Uchida T. Ohya Y. “Large-eddy simulation of turbulent airflow over complex terrain” J.Wind Eng. and Ind. Aerodyn. 91 1-2 219 229 2003
- Hoven Van Der “Power Spectrum of Horizontal Wind Speed in the Frequency Range from 0.0007 to 900 Cycles per Hour” J. Meteorology 14 160 164 1957
- Vino G. Watkins S. Mousley P. “The Passenger Vehicle Wake Under the Influence of Upstream Turbulence” SP 1786 for SAE-Int Warrendale PA USA 0-7680-1213-9 March 2003
- von Karman, T. Progress in the statistical theory of turbulence Proceedings of the National Academy of Sciences U.S. 34 530 9 1948
- Walshe D. E. J. “Wind-Excited Oscillations of Structures” Her Majesty's Stationery Office London, UK 1972
- Watkins S Riegel M Wiedemann J. “The Effect of Turbulence on Wind Noise” 4 th International Stuttgart Symposium FKFS Stuttgart University 20-22nd February 2001 Automotive and Engine Technology, Expert-Verlag 3-8169-1981-2
- Watkins S Saunders J. W. Hoffmann P. H. “Comparison of Road And Wind-Tunnel Drag Reductions For Commercial Vehicles” J. Wind Eng. and Ind. Aerodyn. 49 1-3 411 420 1993
- Watkins S. Cooper K. R. “The Unsteady Wind Environment of Road Vehicles, Part Two, Effects on vehicle development and Simulation of Turbulence” SAE 2007-01-1237 SAE World Congress Detroit 2007
- Watkins S. Saunders J. W. “A Review Of The Wind Conditions Experienced By A Moving Vehicle” SAE Paper 981182 211 218 1998
- Watkins S. Saunders J.W. A Review of the Wind Conditions Experienced by a Moving Vehicle SAE Paper 981182 1998
- Watkins S. Saunders J.W. Turbulence Experience by Road Vehicles under Normal Driving Conditions SAE Paper 950997 1995
- Watkins S. Vino G. “On Vehicle Spacing and its Effect on Drag and Lift” Proceedings of BBAAV 11-15 July 2004 Ottawa, Canada
- Watkins S. “Gusts and Transients” Automobile Wind Noise and Its Measurement Society of Automotive Engineers International Warren, PA, USA 1999 0-7680-0389-X
- Watkins S. Milbank J. Loxton B. Melbourne W. H. “Atmospheric Winds and Their Effects on Microair Vehicles” AIAA Journal 44 11 Nov. 2006
- Watkins S. “The Unsteady Wind Environment of Road Vehicles, Part Two: Generation of Wind-Tunnel Turbulence” SAE Congress 2007
- Watkins S. “Wind-Tunnel Modelling of Vehicle Aerodynamics” RMIT University 1990
- Watkins S. Saunders J. W. Hoffmann P. H. “Turbulence Experienced By Moving Vehicles. Part I. Introduction and Turbulence Intensity” J.Wind Eng. and Ind. Aerodyn. 57 1 1 17 1995
- Watkins, S. Saunders, J.W. Turbulence Experience by Road Vehicles under Normal Driving Conditions 1-56091-628-1 173 182 1995
- Watkins, S. Saunders, J.W. 1998 A Review of the Wind Conditions Experienced by a Moving Vehicle SAE Paper 981182
- Watkins, S. Oswald, G. Czydel, R. Saunders, J. W. Aerodynamically-induced Noise and Vibration of Automobile Add-ons - External Mirrors, Aerials and Roofracks Proceedings Ninth International Pacific Conference on Automotive Engineering Indonesia SAE 971313 391 396 Nov. 1997
- Watkins, S. Saunders, J.W. Hoffmann, P.H. Holmes, J.D. 1995 Measurements of Turbulence Experienced by Moving Vehicles, Part 1, Turbulence Intensity Journal of Wind Engineering & Industrial Aerodynamics 57 1 17
- Watkins, S. Toksoy, S. Saunders, J.W. On the Generation of Tunnel Turbulence for Road Vehicles 11th AFMC Hobart, Australia December 1992
- Wiedemann J. “Turbulence Manipulation to Increase Effective Reynolds Number in Vehicle Aerodynamics” AIAA Journal 27 6 763 769 1989