Experimental Comparison of the Aerodynamic Behavior of Fastback and Notchback DrivAer Models

Wieser, Dirk; Schmidt, Hanns-Joachim; Müller, Stefan; Strangfeld, Christoph; Nayeri, Christian Navid; Paschereit, Christian Oliver

doi:10.4271/2014-01-0613

Cited by 50 publications

(48 citation statements)

References 8 publications

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“…Finally, they state the large influence the mirrors exert on the flow over the windshield and side windows, affecting the A-pillar vortex formation. Strangfeld et al (2013) and Wieser et al (2013) performed further experimental observations on the DrivAer geometry, including side wind conditions.…”

Section: Introductionmentioning

confidence: 99%

Flow over a realistic car model: Wall modeled large eddy simulations assessment and unsteady effects

Aljure

Calafell

Báez

et al. 2018

Journal of Wind Engineering and Industrial Aerodynamics

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Numerical simulations are carried out on the flow over a realistic generic car geometry, the DrivAer-fastback car model. Pure large eddy simulations (LES) and wall-modeled large eddy simulations (WMLES) are used and compared to numerical and experimental results to assess the validity of these approaches when solving the flow field around complex automotive geometries. Results show a 70% CPU time reduction when using the wall model. Drag coefficient results show the influence of the wall model on coarser meshes is positive, reducing the difference on those obtained using finer meshes. Pressure profiles exhibit mixed results. The wall model used works well in adverse pressure gradients and smooth geometry changes. Results worsen in sections

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Section: Introductionmentioning

confidence: 99%

Flow over a realistic car model: Wall modeled large eddy simulations assessment and unsteady effects

Aljure

Calafell

Báez

et al. 2018

Journal of Wind Engineering and Industrial Aerodynamics

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“…The authors reported that the significant drag reduction was noticed at the instance of moderate rear taper angles, whereas there was a rapid rise in drag for a certain slant length of the model. Dirk Wieser et al (2014) conducted empirical and numerical studies of aerodynamic behavior of 1/4th reduced scale of notchback and fastback car model called DrivAer. The surface pressure measurements were collected by varying the side wind configurations of the models considering the Reynolds number not greater than 3.2×10 6 .…”

Section: Introductionmentioning

confidence: 99%

Empirical and Numerical Analysis of Aerodynamic Drag on a Typical SUV Car Model at Different Locations of Vortex Generator

Selvaraju¹,

Parammasivam

2019

JAFM

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The aerodynamic characteristics are concerned with the fuel consumption rate and the stability of a high speed vehicle. The current research aims at studying the aerodynamic behavior of a typical SUV vehicle model mounted with the vortex generator (VG) at various linear positions with reference to its rear roof edge. The flow field around the vehicle model was observed at different wind speed conditions. It had been determined that at the instance of lower wind speed, the VG had minimal effects of aerodynamic drag on the vehicle body. However, at the instance of higher wind speed conditions the magnitude of the drag force decreased significantly. Vehicles move at higher speeds in the highways, location of the VG varied towards the upstream of the vehicle due to early flow separation. Therefore test were conducted at different wind speeds and locations of VG. The numerical simulation conduced in this study provides flow characteristics around the vehicle model for different wind speeds. The realizable k−ε model was used to simulate and validate the empirical results in an effective manner. By using experimental data, the drag was reduced by 9.04 % at the optimized VG location. The results revealed that the induced aerodynamic drag would determine the best car shape. This paper provides a better understanding of VG positioning for enhanced flow separation control.

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“…It was shown that the time-averaged wake consist of two counter rotating vortices which are closed by a 2D saddle point. In a later work Wieser et al [14] presented surface data of the same DrivAer model, where it is shown that the flow pattern over the notchback rear end is asymmetric. However, more detailed information about the flow and wake structure in planes where the flow asymmetry occurs is not given.…”

Section: Introductionmentioning

confidence: 99%

“…Another interesting observation is the occurrence of symmetric and asymmetric flow pattern for different notchback vehicle shapes (for instance [8,9,14]). Sims-Williams et al [9] investigated the flow pattern for different generic notchback geometries and the connection between the backlight angle and the effective backlight angle.…”

Section: Introductionmentioning

confidence: 99%

Investigations of the Rear-End Flow Structures on a Sedan Car

Kounenis

Bonitz

Ljungskog

et al. 2016

SAE Technical Paper Series

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The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. AbstractThe aerodynamic drag, fuel consumption and hence CO 2 emissions, of a road vehicle depend strongly on its flow structures and the pressure drag generated. The rear end flow which is an area of complex three-dimensional flow structures, contributes to the wake development and the overall aerodynamic performance of the vehicle.This paper seeks to provide improved insight into this flow region to better inform future drag reduction strategies. Using experimental and numerical techniques, two vehicle shapes have been studied; a 30% scale model of a Volvo S60 representing a 2003MY vehicle and a full scale 2010MY S60.First the surface topology of the rear end (rear window and trunk deck) of both configurations is analysed, using paint to visualise the skin friction pattern. By means of critical points, the pattern is characterized and changes are identified studying the location and type of the occurring singularities. The flow field away from the surface is then analysed using PIV measurements and CFD for the scale model and CFD simulations for the full scale vehicle. The flow field is investigated regarding its singular points in cross-planes and the correlation between the patterns for the two geometries is analysed.Furthermore, it is discussed how the occurring structures can be described in more generalized terms to be able to compare different vehicle geometries regarding their flow field properties.The results show the extent to which detailed flow structures on similar but distinct vehicles are comparable; as well as providing insight into the complex 3D wake flow.

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Experimental Comparison of the Aerodynamic Behavior of Fastback and Notchback DrivAer Models

Cited by 50 publications

References 8 publications

Flow over a realistic car model: Wall modeled large eddy simulations assessment and unsteady effects

Flow over a realistic car model: Wall modeled large eddy simulations assessment and unsteady effects

Empirical and Numerical Analysis of Aerodynamic Drag on a Typical SUV Car Model at Different Locations of Vortex Generator

Investigations of the Rear-End Flow Structures on a Sedan Car

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