Experiments with Vortex Generators applied to a Notchback Car Model

Wieser, Dirk; Nayeri, Christian Navid; Paschereit, Christian Oliver

doi:10.2514/6.2015-1236

Cited by 6 publications

(4 citation statements)

References 7 publications

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“…The data consisted of forces (drag and lift), pressure measurements, oil film visualizations, and flow field measurements of the rear wake by use of PIV. Raw images of the oil film visualization and raw pressure measurement data were obtained directly from TU Berlin, while the forces and PIV measurements are acquired from published papers [75,65,66,76].…”

Section: Experimental Datamentioning

confidence: 99%

“…These differences indicate that the flow field over the rear part, and especially the rear window, is a sensitive region of the DrivAer notchback body. Thorough wind tunnel measurements have been performed for investigation of the rear part of the DrivAer car body [75,65,76,66]. Oil film visualization over the rear part of the notchback configuration shows complex asymmetric behavior of the near-wall flow, even for symmetric inflow (0 • yaw), Figure 50 and 51.…”

Section: Reliable Accuracy: Hybrid Rans-les Modelsmentioning

confidence: 99%

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Important Factors for Accurate Scale-Resolving Simulations of Automotive Aerodynamics

Ekman

2020

Linköping Studies in Science and Technology. Dissertations

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Road transports are responsible for almost 18 % of the greenhouse gas emission in Europe and are today the leading cause of air pollution in cities. Aerodynamic resistance has a significant effect on fuel consumption and hence the emission of vehicles. For electric vehicles, emissions are not affected by the aerodynamics as such but instead have a significant effect on the effective range of the vehicle.In 2017, a new measurement procedure was introduced, Worldwide Harmonized Light Vehicles Test Procedure (WLTP), for measuring emissions, fuel consumption, and range. This procedure includes a new test cycle with increased average driving speed compared to the former procedure, which thereby increases the importance of the aerodynamic resistance, as it drastically increases with speed. A second effect is that the exact car configuration sold to the customer needs to be certified in terms of fuel consumption and emissions. The result is that every possible combination of optional extras, which might affect the aerodynamic resistance, needs to be aerodynamically analyzed and possibly improved. From 2021, the European Commission will introduce stricter emission regulations for new passenger cars, with the fleet-wide average lowered to 95 grams CO 2 /km, which puts an even higher demand on achieving efficient aerodynamics.

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Section: Experimental Datamentioning

confidence: 99%

Section: Reliable Accuracy: Hybrid Rans-les Modelsmentioning

confidence: 99%

Important Factors for Accurate Scale-Resolving Simulations of Automotive Aerodynamics

Ekman

2020

Linköping Studies in Science and Technology. Dissertations

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“…Studies of flow-control devices on the more realistic DrivAer reference model have been used to relate findings based on simplified vehicle models, such as the Ahmed body, to production cars. Wieser et al [7] investigated the effects of triangular and circular vortex generators on the notchback DrivAer model using wind tunnel experiments. Although a previous study showed that vortex generators are beneficial for the Ahmed body [8], Wieser et al [7] found that their use on the notchback DrivAer model came with a larger drag penalty than drag reduction.…”

Section: Introductionmentioning

confidence: 99%

“…Wieser et al [7] investigated the effects of triangular and circular vortex generators on the notchback DrivAer model using wind tunnel experiments. Although a previous study showed that vortex generators are beneficial for the Ahmed body [8], Wieser et al [7] found that their use on the notchback DrivAer model came with a larger drag penalty than drag reduction.…”

Section: Introductionmentioning

confidence: 99%

Assessment of conventional and air-jet wheel deflectors for drag reduction of the DrivAer model

Nabutola

Boetcher

2021

Adv. Aerodyn.

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Aerodynamic drag is a large resistance force to vehicle motion, particularly at highway speeds. Conventional wheel deflectors were designed to reduce the wheel drag and, consequently, the overall vehicle drag; however, they may actually be detrimental to vehicle aerodynamics in modern designs. In the present study, computational fluid dynamics simulations were conducted on the notchback DrivAer model—a simplified, yet realistic, open-source vehicle model that incorporates features of a modern passenger vehicle. Conventional and air-jet wheel deflectors upstream of the front wheels were introduced to assess the effect of underbody-flow deflection on the vehicle drag. Conventional wheel-deflector designs with varying heights were observed and compared to 45∘ and 90∘ air-jet wheel deflectors. The conventional wheel deflectors reduced wheel drag but resulted in an overall drag increase of up to 10%. For the cases studied, the 90∘ air jet did not reduce the overall drag compared to the baseline case; the 45∘ air jet presented drag benefits of up to 1.5% at 35 m/s and above. Compared to conventional wheel deflectors, air-jet wheel deflectors have the potential to reduce vehicle drag to a greater extent and present the benefit of being turned off at lower speeds when flow deflection is undesirable, thus improving efficiency and reducing emissions.

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Manipulation of the aerodynamic behavior of the DrivAer model using dimple patterns

Ballerstein

Horst

2023

Journal of Wind Engineering and Industrial Aerodynamics

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Experiments with Vortex Generators applied to a Notchback Car Model

Cited by 6 publications

References 7 publications

Important Factors for Accurate Scale-Resolving Simulations of Automotive Aerodynamics

Important Factors for Accurate Scale-Resolving Simulations of Automotive Aerodynamics

Assessment of conventional and air-jet wheel deflectors for drag reduction of the DrivAer model

Manipulation of the aerodynamic behavior of the DrivAer model using dimple patterns

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