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

Journal of Applied Fluid Mechanics

M. M. Rashidi¹  Z. Yang²  D. Bao²  Y. Zhu²  Q. Jia² 

[1] Department of Civil Engineering, School of Engineering, University of Birmingham, Birmingham, UK;Shanghai Automotive Wind Tunnel Center, Tongji University, Shanghai, 201804, China;

关键词: Wind tunnel;    Buffeting;    LES;    PIV;    POD.;   

DOI  :  

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown