Active Flow Control Schemes for Bluff Body Drag Reduction

Whiteman, Jacob T.; Zhuang, Mei

doi:10.1115/fedsm2016-7520

Cited by 3 publications

(4 citation statements)

References 19 publications

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“…Unlike some of the cases observed by [9], the introduction of active flow control in this instance does not appear to eliminate the coherent shedding behaviour (Figure 8). However, a marked increase to the apparent shedding frequency can be observed, with the phase-averaged vorticity now demonstrating that coherent shedding motion is now associated with a frequency of St ≈ 0.37.…”

Section: Resultscontrasting

confidence: 71%

“…However, the lack of coherent shedding activity in proximity to the ground limited the effectiveness of that method. Some success has been seen by Whiteman and Zhuang [9], who utilised constant suction at the top trailing edge and blowing at the centre of base of a two-dimensional Ahmed body. In some cases this yielded drag reductions of up to 75%, however, such reductions were unable to be replicated for a three-dimensional Ahmed body.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Effects of Open-Loop Control on a Two-Dimensional Bluff Body

Easanesan¹,

Burton²,

Thompson³

2020

Australasian Fluid Mechanics Conference (AFMC)

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Active flow control is a growing area of research, which in the context of road vehicle aerodynamics, holds the potential for significant gains in drag reduction. The present study considers the effect of flow control on a simplified two-dimensional vehicle geometry in the presence of a ground plane.Two square-backed, cylindrical geometries with different nose configurations, are the subject of numerical simulations. Openloop flow control, in the form of suction and injection, is applied to both geometries, resulting in a reduction in the overall drag on the body. The two different nose shapes induce significantly different levels of leading-edge separation, and as a consequence, vary markedly in their wake flow characteristics. The interaction between this variability in separation levels and the effectiveness of the control method is also examined.

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Section: Resultscontrasting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

The Effects of Open-Loop Control on a Two-Dimensional Bluff Body

Easanesan¹,

Burton²,

Thompson³

2020

Australasian Fluid Mechanics Conference (AFMC)

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“…The combined control of suction and blowing is seen to be effective on changing the rear window wake structure, in which streamlines of time average flow is separated (without control) and re-attached (with combined control) as shown in Figure 10. Another experimental and numerical studies have been conducted to evaluate the suction and blowing control on drag reduction on an Ahmed body in three different ways namely, (i) only suction, (ii) only blowing and (iii) combination of both control [36]. The outcomes show that their combined effect enhances the drag reduction which is shown in Figure 11 Another experimental investigation with single PA shows that it can reduce drag force in steady and unsteady actuations by 3.65% and 2.44%, respectively [38].…”

Section: Steady Suctionmentioning

confidence: 99%

Review on Aerodynamic Drag Reduction of Vehicles

Mukut

Abedin

2019

IJEMM

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Due to higher price, limited supply and negative impacts on environment by fossil fuel, automobile industries have directed their concentrations in reducing the fuel consumption of vehicles in order to achieve the lower aerodynamic drag. As a consequence, numerous researches have been carried out throughout the world for not only getting the optimum aerodynamic design with lower drag penalty and but also other parameters that increases the fuel consumption. In this regard, relevant experimental and numerical outcomes on vehicle drag reduction considering various techniques such as active, passive and combined techniques in order to delay or suppress flow separation behind the vehicles have been considered in this review paper. Furthermore, the effects of drag reduction and their applicability on the vehicles are also illustrated in this paper. Therefore, it is conjectured that the drag reduction has been improved as much as 20%, 21.2%, and 30% by using the active, passive and combined control systems, respectively.

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“…This is evident by many of study using this flow control on Ahmed body with backlight angle [20][21][22]. The simulation of squareback Ahmed body made by Whiteman and Zhuang [23] give complete picture about performance of suction, blowing and both together. The findings are that high ratio of flow speed of suction/blowing to the freestream speed cause high DR and the value is increased with increasing Re.…”

Section: Steady Suctionmentioning

confidence: 93%

Review on Flow Controls for Vehicles Aerodynamic Drag Reduction

Mariaprakasam

Mat²,

Samin³

et al. 2023

ARFMTS

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Reducing aerodynamic drag in automobiles has been one of the focuses in automotive industry as it will increase vehicles performance and reduce power consumption which subsequently save the environment. Drag is a force that tend to pull the vehicle backwards. Pressure drag is the major contributor to drag of vehicle which caused by lower pressure in the rear area compared to front of vehicle. When vehicle moves forward, the stagnation point occurs in the front part of vehicle. The airflow then goes over the vehicle and separate at the back due to adverse pressure gradient. Thus, flow separation is created in the rear area of vehicle as indicated by the wake. Wake is a low-pressure region that need to be reduced so that the pressure between the front and rear could be reduced to minimize the drag. Flow control is introduced to delay this flow separation and it has been categorized as active and passive. Active flow controls require power input while passive flow controls do not need power input. This review article will explore those studies on flow controls applied in automobiles and investigate their working mechanisms along with research gaps detected. Relative comparison of effectiveness for each flow control is unfeasible as the parameters used differs but this problem can be resolved. Standard parameters need to be used in future researches in order address the discrepancy of results obtained from numerous studies around the globe. A current flow control technique is proposed to be conducted in UTM Aerolab to further investigate this interesting flow field.

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Active Flow Control Schemes for Bluff Body Drag Reduction

Cited by 3 publications

References 19 publications

The Effects of Open-Loop Control on a Two-Dimensional Bluff Body

The Effects of Open-Loop Control on a Two-Dimensional Bluff Body

Review on Aerodynamic Drag Reduction of Vehicles

Review on Flow Controls for Vehicles Aerodynamic Drag Reduction

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