On the Low Frequency Pressure Fluctuation in a 3/4 Open Jet Automotive Wind Tunnel

Q. Jia; Y. Zhu; D. Bao; M. M. Rashidi; Z. Yang

Journal of Applied Fluid Mechanics (Jan 2019)

On the Low Frequency Pressure Fluctuation in a 3/4 Open Jet Automotive Wind Tunnel

Q. Jia,
Y. Zhu,
D. Bao,
M. M. Rashidi,
Z. Yang

Affiliations

Q. Jia: Shanghai Automotive Wind Tunnel Center, Tongji University, Shanghai, 201804, China
Y. Zhu: Shanghai Automotive Wind Tunnel Center, Tongji University, Shanghai, 201804, China
D. Bao: Shanghai Automotive Wind Tunnel Center, Tongji University, Shanghai, 201804, China
M. M. Rashidi: Department of Civil Engineering, School of Engineering, University of Birmingham, Birmingham, UK
Z. Yang: Shanghai Automotive Wind Tunnel Center, Tongji University, Shanghai, 201804, China

Journal volume & issue: Vol. 12, no. 5
pp. 1359 – 1369

Abstract

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In the present research, a possible generation mechanism of low-frequency buffeting phenomenon based on a 1:15 open jet automotive wind tunnel was investigated. Evolution of vortex structures and pressure field in the plenum chamber have been visualized and analyzed by Large-eddy simulation (LES). It is shown that the low frequency pressure fluctuation is caused by the large-scale structures and their interaction. Multiple proper orthogonal decomposition was adopted to analyze the flow field in the plenum chamber. The characteristic frequencies of the vortex-rings after pairing is the same as the dominant resonance of buffeting at this wind velocity.

Wind tunnel; Buffeting; LES; PIV; POD.

Published in Journal of Applied Fluid Mechanics

ISSN: 1735-3572 (Print); 1735-3645 (Online)
Publisher: Isfahan University of Technology
Country of publisher: Iran, Islamic Republic of
LCC subjects: Technology: Mechanical engineering and machinery
Website: https://www.jafmonline.net/

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