水平管路内における界面波の発生(移動床(1),一般講演) [in Japanese] The formation of interfacial waves in horizontal pipes [in Japanese]
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Interfacial waves between sediment and water in open channels, which are called dunes or antidunes, are formed in the range of small and large Froude numbers. Moreover, a phase lag between Interfacial waves and the free water surface is of importance to the instability. However, instability of the interface without free water surface has not been well understood. In this study, we perform a linear stability analysis of the interface between sediment and water in pipes with the use of the mixing length turbulent model. The analysis results show that the governing parameter is the Euler number and Shields parameter, and that the interface is unstable in the range of relatively small Euler numbers.
日本流体力学会年会講演論文集 2008, 235, 2008