Hybrid method for aerodynamic shape optimization in automotive industry

Muyl, Frédérique; Dumas, Laurent; Herbert, Vincent

doi:10.1016/j.compfluid.2003.06.007

Cited by 115 publications

(58 citation statements)

References 4 publications

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“…In recent years the number of studies which have applied Computational Fluid Dynamics (CFD) and optimization methods to improve the aerodynamic design of road vehicles has increased significantly and is recognized as providing a powerful and efficient means of generating improved aerodynamic performance, particularly when detailed experimentation in wind tunnels is not achievable, see e.g. [1,2,3,4,5,6]. The focus of recent studies has been on the drag reduction of Heavy Goods Vehicles, see e.g.…”

Section: Introductionmentioning

confidence: 99%

“…[1,4,5,6,7]. Currently there have been relatively few studies on the aerodynamic improvement of light trucks and cars [8,9], while a small number still have reported reduced aerodynamic drag using automated design optimization techniques [2,8,10].…”

Section: Introductionmentioning

confidence: 99%

“…The equation of the n-order Bezier curve is: (1) where P i represents the set of n+1 control points, t is a parameter that varies between 0 to 1, and is the blending function: (2) In the blending function formula is the binomial coefficient given by , where n defines the Bezier curve's degree of freedom. From figures 1 and equations 1 and 2, it can be seen that the blending functions act as a link between the control points and the points on the Bezier curve.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Aerodynamic CFD Based Optimization of Police Car Using Bezier Curves

Taherkhani¹,

Gilkeson²,

Gaskell³

et al. 2017

SAE Int. J. Mater. Manf.

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This paper investigates the optimization of the aerodynamic design of a police car, BMW 5-series which is popular police force across the UK. A Bezier curve fitting approach is proposed as a tool to improve the existing design of the warning light cluster in order to reduce drag. A formal optimization technique based on Computational Fluid Dynamics (CFD) and moving least squares (MLS) is used to determine the control points for the approximated curve to cover the light-bar and streamline the shape of the roof. The results clearly show that improving the aerodynamic design of the roofs will offer an important opportunity for reducing the fuel consumption and emissions for police vehicles. The optimized police car has 30% less drag than the non-optimized counter-part.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Aerodynamic CFD Based Optimization of Police Car Using Bezier Curves

Taherkhani¹,

Gilkeson²,

Gaskell³

et al. 2017

SAE Int. J. Mater. Manf.

View full text Add to dashboard Cite

show abstract

“…At present, there are mainly two approaches to improve the fuel economy, one is to improve the combustion process in the engine [1], and the other is to reduce the total drag force on the vehicle in motion [2,3]. In considering the latter, although the total drag force mainly consists of rolling resistance and aerodynamic drag, with a medium-size car, aerodynamic drag accounts for nearly 80 percent of the total drag force at 100 km/h.…”

Section: Introductionmentioning

confidence: 99%

Effect of underbody structure on aerodynamic drag and optimization

Zhi-qun¹,

Wang²

2017

J. meas. eng.

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Abstract. The numerical simulation and wind tunnel experiment are employed to investigate the aerodynamic characteristics of automobile. The object is to investigate the sensibility of aerodynamic characteristic to the underbody, and summarize the influence of aerodynamic attachments on the aerodynamic drag, which can provide more useful date as a reference to underbody design of automobile. In the wind tunnel experiments, the aerodynamic drag of automobile with simplified flat underbody is measured. The realizable -model is employed to compute the aerodynamic drag. The computational results show a good agreement with the experimental date, which proving the accuracy of the numerical calculation method. Then the numerical calculation model with real underbody structure is established on this basis. Calculation results show that there are many separation vortexes in the automotive underbody and with a great influence on the aerodynamic characteristics, which is the main reason for the formation of aerodynamic drag and make the aerodynamic drag increased by 23.4 %. In order to reduce drag, A kind of wheel spoiler and three kinds of underbody spoiler are designed, and the influence of the key parameters on aerodynamic drag is analyzed, which both had effective influence for reducing aerodynamic drag, and the largest drop of drag coefficient are 4.86 % and 7.05 % with the reasonable structure designs. The results of calculation and analysis can give suggestion for vehicle designing.

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“…The gain from using hierarchical search is superimposed to that expected from the use of a "better" EA, "better" evolution operators and so forth. According to the literature survey, existing hierarchical schemes can be classified to algorithms relying on different evaluation methods to computer the fitness or cost function of candidate solutions (with different fidelity and CPU cost) (Eby et al 1998, Herrera et al 1999, Sefrioui and Périaux 2000, Karakasis et al 2007, Kampolis et al 2007, Kampolis and Giannakoglou 2008, different search techniques (Muyl et al 2004, Poloni et al 2000, Knowles and Corne 2000 and different chromosome sizes (Lin et al 1994) or numbers of design variables (Désidéri andJanka 2003, Duvigneau et al 2006). The present paper is concerned with the first class of hierarchical methods, i.e.…”

Section: Introductionmentioning

confidence: 99%