Aerodynamics of Trucks in Wind Tunnels: The Importance of Replicating Model Form, Model Detail, Cooling System and Test Conditions

Olson, M. Eugene; Schaub, U. W.

doi:10.4271/920345

Cited by 8 publications

(4 citation statements)

References 6 publications

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“…To ensure an accurate aerodynamic simulation of full-scale vehicles operating below the 3 million transcritical value future test/analysis studies should be performed at the fullscale Reynolds number. These findings support those of Hucho [50] [64] and others. The study results do not support the minimum Re value of 0.7 million value suggested within the SAE J1252 document [105].…”

Section: Discussionsupporting

confidence: 94%

“…The chart show that all Re tr,w values fall between 1 and 3 million with the averaged values for edge radius, wheels, and full vehicle sets in the range of 1.6 to 1.8 million. It is encouraging to note that these data support the findings of Hucho [50] [64] and others. It is discouraging that the study was unable to determine the source for the 0.7 million value suggested within the 1979 SAE J1252 document [105].…”

Section: Transcritical Reynolds Number Summarysupporting

confidence: 88%

“…A number of additional papers [1,3,7,16,25,32,42,50,54,55,63,64,65,66,72,76,78,90,101,103] were reviewed and their findings were evaluated in the context of the Cooper summary charts [25]. Of note is the work by Buckley [16], Delaney [32], Gilhaus [42], Hucho [50], Lindsey [55], Pawlowski [65] and Polhamus [66].…”

Section: Radius Of Curvaturementioning

confidence: 99%

“…The information presented in this paper has been extracted from published works and where available accepted correlation parameters and summary data plots are presented. The evaluation of complete vehicles made use of references 6,8,9,11,13,15,16,18,20,21,22,23,24,26,27,29,33,36,37,44,45,48,49,50,51,52,56,64,70,73,74,77,80,81,82,83,84,85,86,87,91,93,94,95,96,97,100 …”

Section: Introductionmentioning

confidence: 99%

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A Review of Reynolds Number Effects on the Aerodynamics of Commercial Ground Vehicles

Wood¹

2012

SAE Int. J. Commer. Veh.

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A review of Reynolds number scaling and high Reynolds number simulation for commercial ground vehicles is presented. The supporting data was extracted from published wind tunnel tests, coastdown tests and computational studies for complete vehicles and vehicle components. For complex vehicles the data suggest that the use of forced transition for higher Reynolds number simulation is a viable test technique however various component specific schemes may be required to replicate the aerodynamics of a full-scale vehicle. The Reynolds number sensitivity of; boundary layer transition control, surface curvature effects, bluff base flows, wheel/tire aerodynamics, and complete vehicle aerodynamics is presented. The data show that the width-based transcritical Reynolds number for commercial vehicles is between 1 and 3 million with the averaged values for edge radius, wheels and full vehicle data sets between 1.6 and 1.8 million. A minimum width-based transcritical Reynolds number value of 3 million is recommended for simulating the aerodynamics of full-scale commercial vehicles operating at a width-based Reynolds number greater than 3 million. If the dominant aerodynamic and fluid dynamic features of the vehicle are well established the minimum width-based transcritical Reynolds number value that may be used is 2 million. To ensure an accurate simulation of full-scale vehicles operating below the 3 million transcritical value future studies should be performed at the vehicle full-scale Reynolds number.

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Section: Discussionsupporting

confidence: 94%

Section: Transcritical Reynolds Number Summarysupporting

confidence: 88%

Section: Radius Of Curvaturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Review of Reynolds Number Effects on the Aerodynamics of Commercial Ground Vehicles

Wood¹

2012

SAE Int. J. Commer. Veh.

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Prediction of 3-dimensional turbulent flows around corner vane of a heavy-duty truck cab

Kim¹

2003

IJVD

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Effect of Different Parameters on the Drag Coefficient for Commercial Vehicles

Abdel

Gawad

2001

International Conference on Aerospace Sciences and Aviation Tec

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Large commercial vehicles (e.g. truck-trailer combination), due to their function, are bluff bodies by nature. The truck-trailer combination usually gives a drag coefficient that is less than that for a trailer alone. The interference between the commercial vehicles and other small vehicles is of primary importance especially when moving in driving tunnels that are characterized by their limited space. 1/19-scale models for commercial vehicles are employed in the experimental work performed here. Three-dimensional pressure measurements are recorded for analyzing the aerodynamic behavior and calculating the drag coefficient. Add-on devices (deflectors) are used. Measurements are supported by both numerical calculations and flow visualization. Results show that add-on devices play a very important role in improving the aerodynamic characteristics of commercial vehicles.

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Aerodynamics of Trucks in Wind Tunnels: The Importance of Replicating Model Form, Model Detail, Cooling System and Test Conditions

Cited by 8 publications

References 6 publications

A Review of Reynolds Number Effects on the Aerodynamics of Commercial Ground Vehicles

A Review of Reynolds Number Effects on the Aerodynamics of Commercial Ground Vehicles

Prediction of 3-dimensional turbulent flows around corner vane of a heavy-duty truck cab

Effect of Different Parameters on the Drag Coefficient for Commercial Vehicles

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