This paper presents large eddy simulations (LES) of flow around a simplified vehicle model oscillating around its vertical axis. The frequency of the Strouhal number St = and a relatively small amplitude of the oscillation are chosen to be representative for the crosswind conditions of vehicles on the road. The results were found to agree well with data from previous experimental investigations. Furthermore, the differences in LES flows between quasi-steady and dynamic flow conditions are presented and underlying flow mechanisms are explored. The cause of the phenomena of hysteresis and phase shift was found in the inertia of the flow to adjust to sudden changes in the direction of the oscillation of the body.
Issue Section:
Flows in Complex Systems
References
1.
Krajnović
, S.
, 2009, “LES of Flows Around Ground Vehicles and Other Bluff Bodies
,” Philos. Trans. R. Soc. London, Ser. A
, 367
(1899
), pp. 2917
–2930
. 2.
Krajnović
, S.
, and Fernandes
, J.
, 2011, “Numerical Simulation of The Flow Around a Aimplified Vehicle Model With Active Flow Control
,” Int. J. Heat Fluid Flow
, 32
(1
), pp. 192
–200
. 3.
Krajnović
, S.
, Sarmast
, S.
, and Basara
, B.
, 2010, “LES of the Flow Around a Generic Wheel in a Wheelhouse
,” 3rd Joint US-European Fluids Engineering Summer Meeting, Symposium on Issues and Perspectives in Ground Vehicle Flows, FEDSM-ICNMM2010-30687, Montreal, Canada, August 1–5.4.
Beauvais
, F. N.
, 1967, “Transient Nature of Wind Gust Effects on an Automobile
,” SAE International Congress and Exposition, Detroit, MI, SAE Paper No. 670608.5.
Hucho
, W.-H.
, and Emmelmann
, H. J.
, 1973, “Theoretical Prediction of the Aerodynamic Derivatives of a Vehicle in Cross Wind Gusts
,” SAE International Congress and Exposition, Detroit, MI, SAE Paper No. 730232.6.
Garry
, K. P.
, and Cooper
, K. R.
, 1996, “Comparison of Quasi Static and Dynamic Wind-Tunnel Measurements on Simplified Tractor-Trailer Models
,” J. Wind Eng. Ind. Aerodyn.
, 22
, pp. 185
–194
. 7.
Kobayashi
, N.
, and Yamada
, Y.
, 1988, “Stability of One Box Vehicle in a Crosswind—An Analysis of Transient Aerodynamic Forces and Moments
,” SAE International Congress and Exposition, Detroit, MI, SAE Paper No. 881878.8.
Dominy
, R. G.
, and Ryan
, A.
, 1999, “An Improved Wind Tunnel Configuration for the Investigation of Aerodynamic Cross Wind Gust Response
,” SAE International Congress and Exposition, Detroit, MI, SAE Paper No. 1999-01-0808.9.
Krajnović
, S.
, 2008, “Numerical Simulation of the Flow Around an ICE2 Train Under the Influence of a Wind Gust
,” International Conference On Railway Engineering 2008 (IET ICRE2008), Challenges for Railway Transportation in Information Age, Hong Kong, China, March 25–28.10.
Hemida
, H.
, and Krajnović
, S.
, 2009, “Transient Simulation of Aerodynamic Response of a Double-Deck Bus in Gusty Winds
,” ASME J. Fluids Eng.
, 131
(3
), 031101
. 11.
Ryan
A.
, and Dominy
, R. G.
, 1998, “The Aerodynamic Forces Induced on a Passanger Vehicle in Response to a Transient Crosswind Gust at a Relative Incidence of 30°
,” SAE International Congress and Exposition, Detroit, MI, SAE Paper No. 980392.12.
Gilliéron
, P.
, Chometon
, F.
, and Laurent
, J.
, 2003, “Analysis of Hysteresis and Phae Shifting Phenomena in Unsteady Three-Dimensional Wakes
,” Exp. Fluids
, 35
, pp. 117
–129
. 13.
Passmore
, M. A.
, and Mansor
, S.
, 2006, “The Measurement of Transient Aerodynamics Using an Oscillating Model Facility
,” SAE International Congress and Exposition, Detroit, MI, SAE Paper No. 2006-01-0338.14.
Chometon
, F.
, Strzelecki
, A.
, Ferrand
, F.
, Dechipre
, H.
, Dufour
, P.
, Gohlke
, M.
, and Herbert
, H.
, 2005, “Experimental Study of Unsteady Wakes Behind an Oscillating Car Model
,” SAE International Congress and Exposition, Detroit, MI, SAE Technical Paper No. 2005-01-0604.15.
Guimineau
, E.
, and Chometon
, F.
, 2009, “Experimental and Numerical Study of Unsteady Wakes Behind an Oscillating Car Model
,” IUTAM Symposium on Unsteady Separated Flows and Their Control, IUTAM Book Series 14
, pp. 367
–379
.16.
Guilmineau
, E.
, and Chometon
, F.
, 2009, “Effect of Side Wind on a Simplified Car Model: Experimental and Numerical Analysis
,” ASME J. Fluids Eng.
, 131(2)
, 021104
. 17.
Guilmineau
, E.
, Chikhaoui
, O.
, Deng
, G.
, and Visonneau
, M.
, 2009, “Effect de vent lateral sur un modele simplifie de voiture par une methods DES
,” Mec. Ind.
, 10
, pp. 203
–209
.18.
Krajnović
, S.
, and Sarmast
, S.
, 2010, “Numerical Investigation of the Influence of Side Winds on a Simplified Car at Various Yaw Angles
,” 3rd Joint US-European Fluids Engineering Summer Meeting, Symposium on Issues and Perspectives in Ground Vehicle Flows, FEDSM-ICNMM2010-30766, Montreal, Canada, August 1–5.19.
Gohlke
, M.
, Beaudoin
, J. F.
, Amielh
, M.
, and Anselmet
, F.
, 2007, “Experimental Analysis of Flow Structures and Forces on a 3D-Bluff-Body in Constant Cross-Wind
,” Exp. Fluids
, 43
, pp. 579
–594
. 20.
Watkins
, S.
, and Saunders
, J. W.
, 1995, “Turbulence Experienced by Road Vehicles Under Normal Driving Conditions
,” SAE International Congress and Exposition, Detroit, MI, SAE Paper No. 950997.21.
Guilmineau
E.
, and Chometon
, F.
, 2008, “Numerical and Experimental Analysis of Unsteady Separated Flow Behind an Oscillating Car Model
,” SAE International Congress and Exposition, Detroit, MI, SAE Paper No. 2008-01-0738.22.
Smagorinsky
, J.
, 1963, “General Circulation Experiments With the Primitive Equations
,” Mon. Weather Rev.
, 91
(3
), pp. 99
–165
. 23.
Krajnović
, S.
, and Davidson
, L.
, 2002, “Large Eddy Simulation of the Flow Around a Bluff Body
,” AIAA J.
, 40
(5
), pp. 927
–936
. 24.
Krajnović
, S.
, and Davidson
, L.
, 2003, “Numerical Study of the Flow Around the Bus-Shaped Body
,” ASME J. Fluids Eng.
, 125
, pp. 500
–509
. 25.
Krajnović
, S.
, and Davidson
, L.
, 2005, “Flow Around a Simplified Car, Part 1: Large Eddy Simulation
,” ASME J. Fluids Eng.
, 127
, pp. 907
–918
. 26.
Krajnović
, S.
, Bjerklund
, E.
, and Basara
, B.
, 2009 “Simulation of the Flow Around High-Speed Trains Meeting Each Other and at the Exit of a Tunnel
,” 21st International Symposium on Dynamics of Vehicles on Roads and Tracks, Stockholm, Sweden, Aug. 17–21.Copyright © 2011
by by ASME
You do not currently have access to this content.
