Effect of moving surface on the aerodynamic drag of road vehicles

Singh, Santokh; Rai, Lajpat; Puri, Punam; Bhatnagar, Amit

doi:10.1243/095440705x5886

Cited by 25 publications

(16 citation statements)

References 2 publications

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“…Hyun Wook Han 1) ․Hyun Ho Park 1) ․Moon Sang Kim *1) ․Jong Paek Ha 2) ․Yong Nyun Kim (Fig. 21), OSRVM의 항력 변화의 폭은 10N 이내임을 보이고 있다 (Fig.…”

Section: Aerodynamic Performance Dependency On the Geometric Shape Anunclassified

Aerodynamic Performance Dependency on the Geometric Shape and Mounting Location of OSRVM

Han¹,

Park²,

Kim³

et al. 2013

Transactions of the Korean Society of Automotive Engineers

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: This study investigates the effects of OSRVM mounting location and its configurations such as stalk height and housing height on the aerodynamic performance of the passenger car. In order to validate the flow solver, FLUENT which is very well known commercial code, the flow field around an Ahmed Body was analyzed numerically and compared with the experimental data. The predicted aerodynamic performance and flow patterns around a car show good agreements with the experimental data. Mounting location and stalk height should be designed while OSRVM is mounted on the car to evaluate the aerodynamic performance precisely. Housing height, however, may be designed independent of the car because the aerodynamic interference between housing height and car configuration is negligible.

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“…Hyun Wook Han 1) ․Hyun Ho Park 1) ․Moon Sang Kim *1) ․Jong Paek Ha 2) ․Yong Nyun Kim (Fig. 21), OSRVM의 항력 변화의 폭은 10N 이내임을 보이고 있다 (Fig.…”

Section: Aerodynamic Performance Dependency On the Geometric Shape Anunclassified

Aerodynamic Performance Dependency on the Geometric Shape and Mounting Location of OSRVM

Han¹,

Park²,

Kim³

et al. 2013

Transactions of the Korean Society of Automotive Engineers

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“…This flow domain consists of a rectangular cuboid volume which contains the model as shown in Since the blockage was extremely low, no corrections were required [26].…”

Section: Computational Domainmentioning

confidence: 99%

CFD Investigation on 3-Dimensional Interference of a Five-Hole Probe in an Automotive Wheel Arch

Malviya

Mishra

Palmer

2010

Advances in Mechanical Engineering

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Detailed flow measurements are essential for analysing flow structures found in confined spaces, particularly in various automotive applications. These measurements will be extremely helpful in solving flow dependent complexities. Although considerable progress has been made in computational techniques for investigating such flows, experimental flow measurements are still very difficult to carry out therein. Flows mapped using an array of robust instruments like multi-hole pressure probes can provide significant insight into the flow field of such complex flows. Pressure probes can withstand the harsh environments found in such applications; however being intrusive devices significant interference in flow field can limit their applicability. This paper presents an investigation of three-dimensional interference caused by multi-hole pressure probes in an automotive wheel arch. It involves simulation of flow around a pressure probe inserted at various locations within the wheel/wheel arch gap. Pressure and velocity fields along longitudinal and lateral planes have been mapped and the extent of interference caused by the probe along three orthogonal axes has been presented. A three-dimensional ellipsoid of interference has been defined to assist in recommending optimal placement of probes and minimise the error due to interprobe interaction, thus enhancing the measurement accuracy of transient flow phenomena.

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“…Computational analysis is carried out by Singh et al for the two-dimensional truck body using 'FLUENT' and effect of a moving body on aerodynamic drag was shown. A 35 % reduction of aerodynamic drag is reported by the authors using this method [21]. Comparative study on a clay model (scale 15:1) of the small hybrid car is performed following two different experimental procedures of aerodynamic predictions, one relying on pressures downstream and upstream of car model and the other on distribution of pressure along the center line of the model.…”

Section: Introductionmentioning

confidence: 99%

Variation of Drag Coefficient, Wall Static Pressure and Secondary Flow Over Passenger Car

Vedrtnam¹

2018

INT. J. AUTOMOT. MECH. ENG.

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The present experimental investigation includes finding the variation of drag coefficient, wall static pressures, and aerodynamic drag over a vehicle for twenty-six different orientations of vehicle. The flow was controlled using the submerged type vortex generator (VG) in combination with the rear spoiler during the investigation. The model of a vehicle was fabricated on the reducing scale (15:1) using the Plaster of Paris (PoP). Primarily, the vehicle was tested at the different incidence yaw angles to obtain the total drag over the model. Further, twenty-six different combinations obtained by changing the flow angles ( = 0 and 30°), spoiler angles ( =0 and 45°) and orientations of VGs were tested. A variation of static pressures and drag coefficients for all combinations was analyzed. Further, the development of secondary-flow was also traced. Secondary flow becomes important as it causes a sheared flow produced near the body and wall of a sadden vehicle which further deflects the air pressure on the roof of the vehicle body. The variation of the secondary flow was obtained with the wall static pressure, surface static pressure and boundary layer by changing the flow angles ( = 0 and 30°), and spoiler angles ( =0 and 45°) and orientations of VGs. The best combination in terms of surface static pressure coefficient (Cwp) rise (from -0.041 to +2.622) is found at  = 0°,  = 0° and the VG attached to the upstream of the spoiler. CFD analysis is conducted using ANSYS FLUENT ® and Solid Works was used for building the geometries of the car and spoiler. A formulated computational fluid dynamics model is in good match with the experimental results.

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Effect of moving surface on the aerodynamic drag of road vehicles

Cited by 25 publications

References 2 publications

Aerodynamic Performance Dependency on the Geometric Shape and Mounting Location of OSRVM

Aerodynamic Performance Dependency on the Geometric Shape and Mounting Location of OSRVM

CFD Investigation on 3-Dimensional Interference of a Five-Hole Probe in an Automotive Wheel Arch

Variation of Drag Coefficient, Wall Static Pressure and Secondary Flow Over Passenger Car

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