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Journal of Flow Visualization and Image Processing
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.5

ISSN Imprimir: 1065-3090
ISSN On-line: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v17.i1.30
pages 41-56

WAVELET ANALYSIS OF TURBULENT STRUCTURES BEHIND A VEHICLE EXTERNAL MIRROR

Keita Ono
Department of Mechanical Systems Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa-shi, Yamagata 992-8510, Japan

RESUMO

In order to reduce the aerodynamic drag of a vehicle door mirror, the tip shapes of the door mirror are improved by using ditch and concavity in this study. Their aerodynamic drag and the flow structures are quantitatively evaluated. It is found that the aerodynamic drags of the door mirrors can be reduced by the tip shapes of ditch and concavity. The PIV technique was used to measure the instantaneous velocity fields of the mirror wake and the distribution of time-averaged streamlines and Reynolds stresses are examined. Furthermore, the instantaneous turbulent structures are decomposed into the multi-scale structures by the wavelet multi-resolution technique and the distributions of multi-scale Reynolds stresses are analyzed. It is evident that the Reynolds stresses of the small-scale structure can be reduced by improving the tip shape with ditch or concavity.


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