基礎水理・数値解析

[II-115] FUNDAMENTAL CONSIDERATIONS ON HIGH VELOCITY OPEN CHANNEL FLOWS BELOW AN ABRUPT EXPANSION

〇Pisey Tha¹, Takashi Hosoda¹, Puay How Tion² (1.Dept. of Urban Management, Graduate School of Engineering, Kyoto University, 2.University Sains Malaysia)

Keywords:high velocity flow, abrupt expansion, method of characteristics

High velocity open channel flows in the downstream of an abrupt expansion illustrated in Figure are considered as one of the basic flows studied in Hydraulic Engineering. Puay and Hosoda divided the flow into three regions based on the method of characteristics (MOC) as shown in Figure. But the analytical solution of λ₂ line staring at the point W in Figure was not derived yet. In this study, the λ₂ line is calculated using the theoretical relations derived based on MOC. The results are verified in comparison to the simulated results obtained using the shallow water equations converted from the Cartesian coordinate to the generalized curvilinear coordinate.