115 WAVELET ANALYSIS OF A BOUNDED JET
1997 年 17 巻 Supplement1 号 p. 69-72
詳細
1997 年 17 巻 Supplement1 号 p. 69-72
In thispaper, in order to reveal the coherent structure of a turbulent bounded jet in both Fourier and physical spaces, the wavelet transform and local wavelet Reynolds stress are used to analyze the large eddy motions and the secondary flow structure over a measured frequency-physical plane. The experimental fluctuating velocities at various positions in the near field are used for the analyses. From wavelet analysis, the frequency and the time of the large-scale structure inthe shear layer and of the secondary flow near the wall can be determined. The branching structure of multi-scale eddies in the wall shear layer becomes more complex than that in the free shear layer. Due to the effect of the secondary flow the scales of eddy and entrainment process become small.
