The purpose of the research reported in this paper was to investigate the aerodynamic response of a double-deck bus in gusty winds using a detached-eddy simulation (DES). The bus was subjected to three different scenarios of wind gusts: gust in a wind tunnel, gust in a natural wind, and gust behind the exit of a tunnel. The proposed scenarios of gusts are in the time domain and take into account the dynamic behavior of natural winds. The Reynolds number of the flow, based on the time-averaged speed of the side wind and a reference length of , was . Detailed transient responses of the aerodynamic coefficients and flow structures were investigated. Good agreement was found between the DES results and the available experimental data. A comparison between the influence of the different gust scenarios on the aerodynamic coefficients shows that the gust behind the exit from a tunnel has a stronger influence on the aerodynamics than the other gust scenarios. Moreover, the influence of the gusts on the time history of aerodynamic coefficients is found to be limited to the period of the gust.
Issue Section:
Flows in Complex Systems
Keywords:
DES,
side wind,
vehicle aerodynamics,
flow structures,
unsteady flow,
aerodynamics,
transportation
1.
SHK
, 2001, “Fire in a Coach After a Traffic Accident on Highway 70, Fjärdhundra, C län, 21st November 1998
,” Swedish Accident Investigation Board (SHK), Report No. 2001:04.2.
Sigbjörnsson
, R.
, and Snæbjörnsson
, J. T.
, 1998, “Probabilistic Assessment of Wind Related Accidents of Road Vehicles: A Reliability Approach
,” J. Wind. Eng. Ind. Aerodyn.
0167-6105, 74–76
, pp. 1079
–1090
.3.
Chiu
, T. W.
, and Squire
, L. C.
, 1992, “An Experimental Study of the Flow Over a Train in a Crosswind at Large Yaw Angles Up to 90°
,” J. Wind. Eng. Ind. Aerodyn.
0167-6105, 45
, pp. 47
–74
.4.
Suzuki
, M.
, Tanemoto
, K.
, and Maeda
, T.
, 2003, “Aerodynamic Characteristics of Train/Vehicles Under Cross Winds
,” J. Wind. Eng. Ind. Aerodyn.
0167-6105, 91
, pp. 209
–218
.5.
Baker
, C. J.
, Jones
, J.
, Lopez-Calleja
, F.
, and Munday
, J.
, 2004, “Measurements of the Cross Wind Forces on Trains
,” J. Wind. Eng. Ind. Aerodyn.
0167-6105, 92
, pp. 547
–563
.6.
Baker
, C. J.
, 2003, “Some Complex Applications of the Wind Loading Chain
,” J. Wind. Eng. Ind. Aerodyn.
0167-6105, 91
, pp. 1791
–1811
.7.
Hemida
, H.
, and Krajnović
, S.
, 2008, “LES Study of the Influence of a Train Nose Shape on the Flow Structures Under Cross-Wind Conditions
,” ASME J. Fluids Eng.
0098-2202, 130
(9
), p. 091101
.8.
Krajnović
, S.
, Georgii
, J.
, and Hemida
, H.
, 2008, “DES of the Flow Around a High-Speed Train Under the Influence of Wind Gusts
,” Seventh International ERCOFTAC Symposium on Engineering Turbulence Modelling and Measurements, ETMM7
, Amathus, Cyprus, Jun. 4–6.9.
Esra
, O.
, and Bedii
, O.
, 2004, “Turbulent Structure of Three-Dimensional Flow Behind a Model Car: Exposed to Crosswind
,” J. Turbul.
1468-5248, 5
, pp. 1
–18
.10.
Hucho
, W. H.
, and Sovran
, G.
, 1993, “Aerodynamics of Road Vehicles
,” Annu. Rev. Fluid Mech.
0066-4189, 25
, pp. 485
–537
.11.
Baker
, C. J.
, and Reynolds
, S.
, 1992, “Wind-Induced Accidents of Road Vehicles
,” Accid. Anal. Prev.
, 24
(6
), pp. 559
–575
. 0001-457512.
Kobayashi
, T.
, and Kitoh
, K.
, 1983, “Cross-Wind Effects and the Dynamics of Light Cars
,” Int. J. Veh. Des.
0143-3369, Special Publication SP3
, pp. 142
–157
.13.
Diedrichs
, B.
, 2005, “Computational Methods for Crosswind Stability of Railway Trains
,” Division of Railway Technology, Department of Mechanical Engineering, Royal Institute of Technology, Sweden, Stockholm, Report.14.
Matschke
, G.
, 2001, “Sicherheitsnachweis bei seitenwind
,” Deutsche Bahn AG, Konzernrichtlinie 401, Version 03.2001.15.
DEUFRAKU Project
, 2004, “Side Wind Behaviour of Rail Vehicles (Project No. 19p0056b)
,” http://www.transport-research.info/web/projects/http://www.transport-research.info/web/projects/16.
Ryan
, A.
, and Dominy
, R. G.
, 2000, “Wake Surveys Behind a Passenger Car Subjected to a Transient Cross-Wind Gust
,” SAE Paper No. 2000-01-0874.17.
Howell
, J. P.
, 1986, “Aerodynamic Response of MAGLEV Train Models to a Crosswind Gust
,” J. Wind. Eng. Ind. Aerodyn.
0167-6105, 22
, pp. 205
–213
.18.
Clarke
, J.
, and Filippone
, A.
, 2007, “Unsteady Computational Analysis of Vehicle Passing
,” ASME J. Fluids Eng.
0098-2202, 129
, pp. 359
–367
.19.
Filippone
, A.
, 2003, “Unsteady Gust Response of Road Vehicles
,” ASME J. Fluids Eng.
0098-2202, 125
, pp. 806
–812
.20.
Patrick
, G.
, and Christophe
, N.
, 2004, “Contribution to the Analysis of Transient Aerodynamic Effects Acting on Vehicles
,” SAE Paper No. 2004-01-1311.21.
Baker
, C. J.
, 1991, “Ground Vehicles in High Cross Winds, Part II: Unsteady Aerodynamic Forces
,” J. Fluids Struct.
, 5
, pp. 91
–111
. 0889-974622.
Cheli
, F.
, Belforte
, P.
, Melzi
, S.
, Sabbioni
, E.
, and Tomasini
, G.
, 2006, “Numerical-Experimental Approach for Evaluating Cross-Wind Aerodynamic Effects on Heavy Vehicles
,” Veh. Syst. Dyn.
0042-3114, 44
, pp. 791
–804
.23.
Juhlin
, M.
, 2005, “A Study on Crosswind Sensitivity of Buses
,” thesis for Licentiate of Engineering, Department of Aeronautical and Vehicle Engineering, The Royal Institute of Technology (KTH), Sweden.24.
Petzäll
, J.
, Torlund
, P. A.
, Falkmer
, T.
, Albertsson
, P.
, and Björnsting
, U.
, 2008, “Aerodynamic Design of High-Sided Coaches to Reduce Cross-Wind Sensitivity, Based on Wind Tunnel Tests
,” Int. J. Crashworthiness
1358-8265, 13
, pp. 158
–194
.25.
Hemida
, H.
, and Krajnović
, S.
, 2007, “DES of the Flow Around a Realistic Bus Model Subjected to a Side Wind With a 30° Yaw Angle
,” Fifth IASME/WSEAS International Conference on Fluid Mechanics and Aerodynamics
, Athens, Greece, Aug. 25–27.26.
Per-Åke
, T.
, 1999, “Experimentell undersökning av sidvindskänsligheten hos en modell av en tvåvåningsbuss i FFA:s vindtunnel LT1
,” Report No. FFA TN 2000-05, in Swedish.28.
Kader
, B.
, 1981, “Temperature and Concentration Profiles in Fully Turbulent Boundary Layers
,” Int. J. Heat Mass Transfer
0017-9310, 24
(9
), pp. 1541
–1544
.29.
Shur
, M.
, Spalart
, P. R.
, Strelets
, M.
, and Travin
, A.
, 1999, “Detached-Eddy Simulation on an Airfoil at High Angle of Attack
,” Engineering Turbulence Modelling and Experiments 4
, W.
Rodi
and D.
Laurence
, eds., Elsevier
, New York
, pp. 669
–678
.30.
Constantinescu
, G. S.
, and Squires
, K. D.
, 2003, “LES and DES Investigations of Turbulent Flow Over a Sphere at Re=10,000
,” Flow, Turbul. Combust.
1386-6184, 70
, pp. 267
–298
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