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ISSN Онлайн: 2642-0554

TURBULENT STRUCTURES IN OPEN-CHANNEL FLOWS WITH STRONG UNSTEADINESS

Iehisa Nezu
Dept. of Global Environment Engineering, Kyoto University Kyoto, 606-8501, Japan

Kouki Onitsuka
Department of Civil and Global Environment Engineering, Kyoto University; Department of Civil Engineering, Kyushu Institute of Technology Kita-Kyushu, 804-8550, Japan

Аннотация

Turbulence measurements in unsteady open-channel flows over a smooth wall including wide unsteadiness ranges were conducted with two sets of LDAs. It is concluded that the von Karman constant κ is regarded to be a universal constant, i.e., κ =0.41, if the unsteadiness parameter α is smaller than 0.002. The spanwise velocity fluctuations in unsteady open-channel flows were successfully measured for the first time in this study. It was found that the distributions of spanwise turbulent intensity can be described well by Nezu's(1977) empirical formula except for strong unsteadiness flow.