Unsteady pressure analysis of the near wall flow downstream of the front wheel of a passenger car under yaw conditions

Bonitz, Sabine; Larsson, Lars; Sebben, Simone

doi:10.1016/j.ijheatfluidflow.2018.07.007

Cited by 5 publications

(5 citation statements)

References 23 publications

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“…These flow structures presented for the baseline case with wheel spacing of 3.0 d are in broad agreement with what was presented by Regert et al [15]. Given the geometric differences in the reference bodies used, vortex positioning and magnitude are comparable to other studies [14][15][16]25,47,48], concerning wheelhouse flows. A comparison of pressure coefficients between the front and rear wheels for the baseline case is shown in Figure 11.…”

Section: Rear Wheel and Wheelhouse Vorticessupporting

confidence: 89%

A Detailed Numerical Study on Aerodynamic Interactions of Tandem Wheels on a Generic Vehicle

Radovic,

Salehi,

Diasinos

2023

Fluids

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Wheels contribute significantly to the aerodynamic performance of ground vehicles. Many studies have focused on investigating a single wheel either in isolation or in a wheelhouse. However, there has been less focus on the flow field around a rear wheel, especially when considering varying proximity to the front wheel, despite its importance on aerodynamic forces. In this study, a generic reference body is modified and fitted with a rear wheel within a wheelhouse and analysed while the wheel spacing varies. Reynolds-Averaged Navier–Stokes (RANS) modelling was employed to allow for multiple variations to be considered and the model produced results in good agreement with experimental results. The results confirm that two upper rear wheelhouse outflow vortices are only present when the wheel spacing is short. It was found that the drag values were minimal for the wheel spacing at a critical distance of 1.5 wheel diameters. At this wheel spacing, the formation of the outboard jetting vortex is prevented at the rear wheel, and hence, the rear wheel drag is reduced by more than 10%. Any further reduction in the spacing does not provide any drag benefits. Also, the outflow from the front wheelhouse is projected further away from the body, drawing flow from the rear wheelhouse into the outboard jetting vortex.

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Section: Rear Wheel and Wheelhouse Vorticessupporting

confidence: 89%

A Detailed Numerical Study on Aerodynamic Interactions of Tandem Wheels on a Generic Vehicle

Radovic,

Salehi,

Diasinos

2023

Fluids

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“…Moreover, another phenomenon that should be noticed is the low-pressure region behind the front wheelhouses in MGRW (marked in the red oval). However, as mentioned in previous studies, because the rotating wheel can reduce its own wake [3,12], the results in Figure 7 seem to be in contradiction. Figure 8 shows the time-averaged velocity contour on z = −0.07 m plane.…”

Section: General Uasnderstanding Of Mgrwmentioning

confidence: 49%

“…Pavia et al [11] studied the unsteady flow characteristics generated by rotating wheels and pointed out that wheel rotation can affect the wake bi-stability of the vehicle as well as the aerodynamic forces. Bonitz et al [12] found that the flow frequency downstream of the wheels can be altered by the wheel rotation. Wang et al [13] conducted research on the effect of the moving ground and rotating wheels on the aerodynamics of a square-back car model and found that the wheel and ground conditions mainly influence flow near the ground.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Study of the Aerodynamic Influence of Ground and Wheel States on the Notchback DrivAer

Jia

Yang

2022

Energies

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This paper conducts an analysis of the aerodynamic influence of different ground and wheel states on the Notchback DrivAer by numerical simulation. The effects of the moving ground and rotating wheels are investigated individually and comprehensively. Experimental data are also included for validation. Through this study, a unique and important low-drag state is observed, in which the vehicle wake near the center region becomes more symmetrical, the pressure on the upper middle base is recovered and the total aerodynamic drag decreases significantly. Furthermore, the formation of this state is determined by the flow rate near the surface of the rear underbody. When the wheels are rotating, the wheel wakes are weakened. On one hand, the drag of wheels and the two sides of the base region is reduced. On the other hand, the boundary layer near the underbody is thinned and the flow near the underbody surface is accelerated, transforming the wake to the low-drag state. Moreover, the moving ground can enhance the wheel wake but its effect on the flow rate near the underbody is complicated. This may be one of the important reasons why the aerodynamic effects of wheel & ground states depend on the vehicle model. Finally, the global effects of wheel rotation and ground movement can affect each other so they should be analyzed together in the vehicle design process.

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“…Pavia et al [21] studied the unsteady flow characteristics generated by rotating wheels and pointed out that wheel rotation could affect the wake bistability of the vehicle, as well as the aerodynamic forces. Bonitz et al [22] found that the flow frequency downstream of the wheels could be altered by the wheel rotation. Wang et al [23] conducted research on the effects of moving ground and rotating wheels on the aerodynamics of a square-back car model and found that the wheel and ground conditions mainly influenced the flow near the ground.…”

Section: Introductionmentioning

confidence: 99%

Computational Investigation of the Aerodynamics of a Wheel Installed on a Race Car with a Multi-Element Front Wing

Cravero

2022

Fluids

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The search for high aerodynamic performance of a race car is one of the main aspects of the design process. The flow around the basic body shape is complicated by the presence of the rotating wheels. This is especially true in race cars on which the wheels are not shrouded, where the effects on the flow field are considerable. Despite this, few works have focused on the flow around the rotating wheels. In this paper, CFD techniques were used to provide a detailed analysis of the flow structures generated by the interaction between a multielement inverted wing and the wheel of an open-wheel race car. In the first part, the CFD approach was validated for the isolated wheel case by comparing the results with experimental and numerical data from the literature. The wheel was analyzed both in stationary and unsteady flow conditions. Then, the CFD model was adopted to study the interaction of the flow structures between the wheel with the real grooves on the tire and the front wing of a Formula 1 car. Three different configurations were considered in order to differentiate the individual effects. The discussions were supported by the values of the aerodynamic performance coefficients and flow contours.

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Unsteady pressure analysis of the near wall flow downstream of the front wheel of a passenger car under yaw conditions

Cited by 5 publications

References 23 publications

A Detailed Numerical Study on Aerodynamic Interactions of Tandem Wheels on a Generic Vehicle

A Detailed Numerical Study on Aerodynamic Interactions of Tandem Wheels on a Generic Vehicle

Comprehensive Study of the Aerodynamic Influence of Ground and Wheel States on the Notchback DrivAer

Computational Investigation of the Aerodynamics of a Wheel Installed on a Race Car with a Multi-Element Front Wing

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