Author/Authors :
Jia, Q Shanghai Automotive Wind Tunnel Center - Tongji University, Shanghai, China , Zhu, Y Shanghai Automotive Wind Tunnel Center - Tongji University, Shanghai, China , Bao, D Shanghai Automotive Wind Tunnel Center - Tongji University, Shanghai, China , Rashidi, M. M Department of Civil Engineering - School of Engineering - University of Birmingham, Edgbaston, Birmingham, United Kingdom , Yang, Z Shanghai Automotive Wind Tunnel Center - Tongji University, Shanghai, China
Abstract :
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.
Keywords :
Wind tunnel , Buffeting , LES , PIV , POD
