Multi-objective aero acoustic optimization of rear end in a simplified car model by using hybrid Robust Parameter Design, Artificial Neural Networks and Genetic Algorithm methods

Beigmoradi, Sajjad; Hajabdollahi, Hassan; Ramezani, Asghar

doi:10.1016/j.compfluid.2013.11.026

Cited by 34 publications

(9 citation statements)

References 19 publications

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“…The separation of boundary layer flows has been an Aeronautics engineer's main focus since the inception of fluid mechanics. The need to alter the naturally occurring flow field to a more beneficial state has been accomplished by both inhibition and excitation of separating flows [7][8][9][10][18][19][20][21][22]. Separation control in the specific case of bluff bodies can be described by three main philosophies; delaying the onset of separation and vortices formation, reducing the general magnitude of the shedding, or breaking apart the vortical structures.…”

Section: Control Scheme Advancementsmentioning

confidence: 99%

Active Flow Control Schemes for Bluff Body Drag Reduction

Whiteman

Zhuang

2016

Volume 1A, Symposia: Turbomachinery Flow Simulation and Optimization; Applications in CFD; Bio-Inspired and Bio-Medical Fluid M

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Numerical simulation experiments on vortex shedding and corresponding drag coefficients from a two-dimensional bluff body are performed over a range of Reynolds numbers from one to four million. Active control is implemented on the body via velocity boundary conditions in the form of blowing and suction jets. These controls range in velocity from half to double the free-stream inlet velocity. An overall drag coefficient reduction in excess of 75% is observed for maximum power input to the actuators. In addition, a trend of increasing Strouhal number for each successive increase in actuator power (and corresponding reduction in drag) is noted. Important physical mechanisms involving near-body wake flow are analyzed to determine optimal wake flow pattern and corresponding control schemes.

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Section: Control Scheme Advancementsmentioning

confidence: 99%

Active Flow Control Schemes for Bluff Body Drag Reduction

Whiteman

Zhuang

2016

Volume 1A, Symposia: Turbomachinery Flow Simulation and Optimization; Applications in CFD; Bio-Inspired and Bio-Medical Fluid M

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“…Aerodynamic noises caused by the rear view mirror will also become an important part of vehicle noises. How to reduce the aerodynamic noise during high-speed running has become a studied hot topic [1][2][3][4]. Noises caused by running airflows include: noises caused when air enters a vehicle through door windows; aerodynamic noises caused by vortexes which are generated when airflows get contact with the body, as well as vibration noises caused by friction between air and the body; vibration noises caused by convex structures on the body.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation and experimental test on aerodynamic noises of the bionic rear view mirror in vehicles

Wan¹,

Ma²

2017

J. vibroeng.

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At present, there are some researches focusing on optimization of aerodynamic noises on rear view mirrors, but researches on bionic noise reduction of rear view mirrors are rarely reported. Therefore, with an original rear view mirror as the basic model, the paper applied a head convex hull of a dung beetle to the original rear view mirror cover to obtain a bionic rear view mirror, then conducted numerical computation for aerodynamic noises of the bionic rear view mirror and compared the computational results with the original model. Finally, in order to verify correctness of computational results of aerodynamic noises of the rear view mirror, wind tunnel test was conducted on the rear view mirror. Experimental and numerical simulation results were highly consistent in the whole frequency band, so the wind tunnel test could be replaced by numerical simulation. Only one obvious vortex was behind the bionic rear view mirror, but two obvious vortexes with the opposite rotation directions were behind the original rear view mirror. The bionic rear view mirror did not present vortexes near the lateral window, so impacts of vortexes on noises in the vehicle could be eliminated effectively. Pressure difference in front of and behind the bionic view mirror was smaller than the pressure difference in front of and behind the original rear view mirror. Pressure resistance caused by the convex structure outside the rear view mirror was reduced, so noise reduction could be promoted. The convex structure mainly affected the aerodynamic noise in mid-high frequency regions. Compared with the original rear view mirror, noise reduction effects of the bionic rear view mirror were obvious, where the noise reduction amplitude reached 10dB. Noise source size and intensity of the bionic rear view mirror were reduced obviously.

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“…Recently, the interest in such a kind of calculations is grown, thanks to the enhanced computational power of nowadays computers. In [4], for instance, a turbulent model was used in the CFD calculations and the rear of a car model was optimized using genetic algorithm method. This is an example of the increasing interest in detailed aeroacoustics simulations at the design level in automobiles.…”

Section: Introductionmentioning

confidence: 99%