Aerodynamic Disturbances Encountered in Highway Passing Situations

Brown, Glen

doi:10.4271/730234

Cited by 4 publications

(7 citation statements)

References 2 publications

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“…Similar results are shown here for the side force and yawing moment in Figure 6 A review of the available literature, eg [6], [7], [12], suggests that the effect of overtaking speed is negligible, especially for small differences in speed. Many of the experiments reported in the literature refer to vehicles of comparable size.…”

Section: Discussionsupporting

confidence: 85%

“…The flow related side force component will be a function of the local flow angle and when the car and truck velocities are equal is approximately: (4) where C Yβ is the gradient of side force with yaw and A is the frontal area of the car. When the car is travelling at velocity, V C , the side force becomes; (5) Assuming that ΔV X is very much smaller than V C or V T , then equation (3) in coefficient form, based on the truck velocity, V T , and car frontal area, A, becomes: (6) As the function f(ΔV Y ) will be directly related to V T along a given path, equation (6) can be written simply as: (7) Similar expressions can be developed for the rolling and yawing moment: (8) The side force and yawing moment data presented by Schrefl et al, [13], has been replotted in Figure 8 using values estimated from his published results and converted for the relevant reference speed. The vertical axis represents the increase in the side force or yawing moment above the extrapolated notional value for a velocity ratio V C /V T = 1.0, and normalised by the yaw derivatives for the same vehicle given by Mayer et al, [15].…”

Section: Discussionmentioning

confidence: 99%

“…Several authors, eg [4], [6], [12], have shown that the peak loads increase as the lateral offset between vehicles reduces. Similar results are shown here for the side force and yawing moment in Figure 6 A review of the available literature, eg [6], [7], [12], suggests that the effect of overtaking speed is negligible, especially for small differences in speed.…”

Section: Discussionmentioning

confidence: 99%

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confidence: 99%

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The Aerodynamics of a Small Car Overtaking a Truck

Howell¹,

Garry²,

Holt³

2014

SAE Int. J. Passeng. Cars - Mech. Syst.

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A more ambitious dynamic experiment was undertaken by Brown and Seeman,[6], using models catapulted along parallel tracks and passing a crosswind generator. Spacing between vehicles and relative velocities, including vehicles passing in opposite directions could be represented. The shape of the ABSTRACT The influence of a large truck on the aerodynamics of a small passenger car in an overtaking manoeuvre on the motorway was considered, many years ago, during the 1970's, to be a potential problem for the vehicle aerodynamicist. The concern never became significant as vehicle architecture evolved and car weights increased. The current drive for improved fuel economy is advocating that a considerable reduction in vehicle mass is desirable and therefore it may be time to readdress the significance of the truck passing manoeuvre. A quasi-steady experiment has been undertaken at small model scale to examine the aerodynamic characteristics of a small car in proximity to a large truck. Measurements at yaw were included to crudely simulate the effects of a crosswind. The wind tunnel data is presented and the limitations of the experimental procedure are discussed. An estimate of the increased aerodynamic input on a car in a real world overtaking manoeuvre with relative velocity between the two vehicles is introduced. The data is compared with the steady state yaw characteristics of the car alone to relate truck passing with the general concern of crosswind sensitivity. Under the same crosswind conditions the truck passing manoeuvre is shown to be a more extreme, but rarer event.

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Section: Discussionsupporting

confidence: 85%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…

…”

mentioning

confidence: 99%

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The Aerodynamics of a Small Car Overtaking a Truck

Howell¹,

Garry²,

Holt³

2014

SAE Int. J. Passeng. Cars - Mech. Syst.

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“…Heffley [5] considered aerodynamics of model passenger cars in close proximity to trucks and buses. Brown and Seeman [6] performed a dynamic experiment using models ejected along parallel tracks and a tailwind generator.…”

Section: Introductionmentioning

confidence: 99%

Problem of Aerodynamic Interaction of Traffic Streams

Solodov¹

2020

Transport Problems

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This study presents a model of continuous oncoming traffic flows of vehicles along highways. The flow of atmospheric air and impurity particles is modeled numerically based on unsteady Reynolds-Averaged Navier-Stokes equations using the MTFS ® authoring software. Detailing of the flow patterns allows arbitrary length regions of periodicity, taking into account a crosswind. The examples provided demonstrate some of the results of the aerodynamic interaction of two oncoming columns of vehicles. The model of aerodynamic interaction of vehicles in traffic on a straight section of road in tunnels allows an arbitrary number of vehicles in each sub-region, along with an arbitrary, periodically repeating configuration of vegetation and buildings on the side of the road to be considered.

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Aerodynamic influence of a passing vehicle on the stability of the other vehicles

Yamamoto

1997

JSAE Review

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Aerodynamic Disturbances Encountered in Highway Passing Situations

Cited by 4 publications

References 2 publications

The Aerodynamics of a Small Car Overtaking a Truck

The Aerodynamics of a Small Car Overtaking a Truck

Problem of Aerodynamic Interaction of Traffic Streams

Aerodynamic influence of a passing vehicle on the stability of the other vehicles

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