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You are here : eLibrary : IAHR World Congress Proceedings : 35th IAHR Congress - Chengdu (2013) : THEME 4 - HYDRO-ENVIRONMENT : On the Fundamental Characteristics of Super-critical Flow at Abrupt Expansion
On the Fundamental Characteristics of Super-critical Flow at Abrupt Expansion
Author : How Tion Puay and Takashi Hosoda
This paper describes some of the fundamental characteristics of super-critical flow discharged from an abrupt expansion structure. The flow structure near the abrupt expansion is studied by d ividing the flow into inertia-pressure flow region and shear stress-pressure flow region. The inertia-pressure flow region is a region where the flow is under inertia and pressure equilibrium. On the other hand, the shear stress-pressure flow region is the region where the flow is governed by the bed shear stress and pressure equilibrium. Firstly, the inertia-pressure flow region which is situated near the abrupt expansion is studied by using the method of characteristic (MOC). Flow characteristics such as the expansion angle of the zero-depth and characteristic flow zone are shown. Further downstream, where the shear stress-pressure flow region exists, analysis based on the assumption of self-similarity of hydraulics parameter reveals characteristic exponents for the attenuation of flow along center line when travelling downstream. Based on the same self-similarity assumption, the lateral flow profile is also derived for this region. Findings in both inertia-pressure and shear stress-pressure flow regions are verified with depth-averaged numerical model.
File Size : 694,016 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 35th IAHR Congress - Chengdu (2013)
Article : THEME 4 - HYDRO-ENVIRONMENT
Date Published : 18/07/2016
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