Investigation of Wheel Aerodynamic Resistance of Passenger Cars

Vdovin, Alexey; Löfdahl, Lennart; Sebben, Simone

doi:10.4271/2014-01-0606

Cited by 16 publications

(17 citation statements)

References 7 publications

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“…Looking at Figure 4b, a "stagnation point" (12) and its occurrence as a node of attachment on the front screen can be seen very clearly. From the node there is also an attachment line, stretching almost over the whole window width.…”

Section: Figure 4 Limiting Streamlines On the Upper Body Of A Passengmentioning

confidence: 94%

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Investigation of three-dimensional flow separation patterns and surface pressure gradients on a notchback vehicle

Bonitz

Löfdahl

Larsson

et al. 2014

The International Vehicle Aerodynamics Conference

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Section: Figure 4 Limiting Streamlines On the Upper Body Of A Passengmentioning

confidence: 94%

“…The investigations are based on the RANS simulations carried out by Vdovin et al [12] in StarCCM+ v8.04. The analysis of the simulations was done in the commercial software Ensight V10.0.3.…”

Section: Crossflow Separationmentioning

confidence: 99%

Investigation of three-dimensional flow separation patterns and surface pressure gradients on a notchback vehicle

Bonitz

Löfdahl

Larsson

et al. 2014

The International Vehicle Aerodynamics Conference

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“…For the numerical simulation a full scale model with a detailed underbody was used as can be seen in Figure 4 The CFD simulations were done in Star CCM + v8.04 and post processed in ENSIGHT 10.0.3. For the investigation a steady state RANS calculation with a realizable k-ε turbulence model was used, based on the work of [18].…”

Section: Test Object and Numerical Modelmentioning

confidence: 99%

Structures of Flow Separation on a Passenger Car

Bonitz¹,

Larsson²,

Löfdahl³

et al. 2015

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

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The phenomenon of three-dimensional flow separation is and has been in the focus of many researchers. An improved understanding of the physics and the driving forces is desired to be able to improve numerical simulations and to minimize aerodynamic drag over bluff bodies.To investigate the sources of separation one wants to understand what happens at the surface when the flow starts to detach and the upwelling of the streamlines becomes strong. This observation of a flow leaving the surface could be captured by investigating the limiting streamlines and surface parameters as pressure, vorticity or the shear stress.In this paper, numerical methods are used to investigate the surface pressure and flow patterns on a sedan passenger vehicle. Observed limiting streamlines are compared to the pressure distribution and their correlation is shown. For this investigation the region behind the antenna and behind the wheel arch, are pointed out and studied in detail.Besides the discussion of the correlation between limiting streamlines and the surface pressure distribution, it is discussed how the surface pressure and limiting streamline development is formed. It is shown how vortices emanating from the antenna influence the surface pressure and therefore the limiting streamline pattern. Behind the front wheel arch it is explained how the separation bubble upstream influences the development of the limiting streamlines further downstream.

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“…Part of the work in this paper was in relation to obtaining successful PIV measurements within a large working section, hence it will be discussed briefly here. More detailed information regarding PIV can be found in [25,26,27].…”

Section: Particle Image Velocimetry (Piv)mentioning

confidence: 99%

“…For the numerical simulations of the full-scale model, the approach previously described in [26] was used. The simulations were performed on a fully detailed model in Star-CCM+, where a steady state RANS approach was used with a realizable k-ɛ turbulence model.…”

Section: Full-scale Modelmentioning

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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Investigation of Wheel Aerodynamic Resistance of Passenger Cars

Cited by 16 publications

References 7 publications

Investigation of three-dimensional flow separation patterns and surface pressure gradients on a notchback vehicle

Investigation of three-dimensional flow separation patterns and surface pressure gradients on a notchback vehicle

Structures of Flow Separation on a Passenger Car

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

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