ランダム位相法において入力周波数が乱流スケールに及ぼす 影響に関する観察

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  • Observation of the Effect of Input Frequencies on Turbulent Scale by Random-Phase Method

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Control of turbulence intensity and scale is fundamentally important in the study of turbulence. In this study, we used a random-phase method to investigate the effect of input frequencies on the turbulent scale. The method makes use of shear layers generated between the outfows from adjacent ducts, and is realized high intensity (12-16%) and large integral scale (0.6-0.7m). It is known that the vortex size depends on the size of the lattice in studies using lattice turbulence, while there is no equivalent in the random phase method. This study aims to clarify the dominant parameter for the integral scale in the random phase method, and examines its dependence using turbulence with different frequencies. As experimental results the scale depended on the frequencies of the input velocity signal. Thus, it is expected that the scale might be controlled by the frequencies.

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