D111 円管内遷移における初期乱れの構造

概要

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It is well known that there appears a peculiar turbulent blob called a "puff" in transitional pipe flow. The structure was clarified by many researchers, while the condition leading to the generation is not clear yet. We clarify the turbulence structure leading to the generation of puffs. A periodic disturbance of strong intensity was introduced by a loud speaker at a fixed Reynolds number 2,200. The power spectrum of the turbulence has the same slope -3.3 for every condition of the generation of puffs. The characteristic of the power spectrum is universal and independent of disturbance characters such as their intensity and frequency. We first determine the fractal dimension of the velocity fluctuation. Next we investigate the dynamical behavior of turbulence which leads to the generation of puffs.
日本流体力学会の論文
2000-07-25