G207 テイラー渦流におけるカオス的流れへの遷移のウェーブレット解析(オーガナイズドセッション20 : 複雑性熱流体現象 : 熱流体のカオスとフラクタル)

概要

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The purpose of thr present work is to investigate the transition from periodic to chaotic flows in Taylor vortex flow with the aid of a wavelet analysis. Time series data of fluctuating tangential velocity were obtained with a fiberoptic laser-Doppler velocimeter. To clarify the dependence of time-fluctuation flow properties on spatial location, the velocity was measured at several positions within each'vortex. In order to estimate wavelet correlation patterns, logarithmic expectation and information entropy were calculated at each time scale. The wavelet patterns revealed that the time-fluctuation properties depend not only on the spatial location but also time. The continuous wavelet transform analysis can provide a promising technique to reveal a fractal structure of chaotic flow.
社団法人日本機械学会の論文
2001-11-03