超高速流の内部構造に関する実験的研究

2次元乱れ挙動について

抄録

On steep slope channel beds, It is well known that thin sheet flow has periodic Roll-Wave trains, but experimentally derived data is scant to this date. The hydraulic characteristics of Roll-Wave flow are experimentally reproduced and mean velocity, turbulence intensity, Reynolds stress and correlation coefficients of Reynolds stress are compared to corresponding Uniform flow data. In addition, a structural definition of Roll-Wave flow is attempted using instantaneously obtained values of main flow u, vertical flow v to the bed. The results indicate Rall-Wave flow's mean velocity is similar to Uniform flow's mean velocity, but differs in regard to turbulence pattern. It is hypothesized that velocity fluctuations and Reynolds stress are strongly influenced by water depth variance and Roll-Wave front.