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http://dx.doi.org/10.3741/JKWRA.2019.52.1.1

Numerical analysis of flow characteristics at the bifurcation channel by changing of discharge ratio using TELEMAC-2D  

Jung, Daejin (Chungnam Regional Headquarters of Korea Rural Cooperation)
Jang, Chang-Lae (Department of Civil Engineering, Korea National University of Transportation)
Jung, Kwansue (Department of Civil Engineering, Chungnam National University)
Publication Information
Journal of Korea Water Resources Association / v.52, no.1, 2019 , pp. 1-10 More about this Journal
Abstract
This study investigates the flow characteristics, such as velocity distributions, size and location of recirculation zone, longitudinal flow change rates, and bifurcation discharge ratio in the bifurcation channel by TELEMAC-2D, a 2D numerical model. The numerical model is validated by previous experimental results and the numerical results are in relatively good agreement with the experimental results, such as the water surface elevation and velocity distribution in the channels. As the inertial force and moment in the main channel decrease, the bifurcation discharge ratio increases, and the relative high velocity distribution becomes wider and the reverse velocity of the main stream decreases in the branch channel. As the bifurcation discharge ratio increases, the size of the recirculation zone in the branch channel decreases and it can be more clearly calculated by determining the point where the longitudinal froude number $Fr{\approx}0$ as well as drawing the distribution of the streamline distribution.
Keywords
Bifurcation; Recirculation zone; Bifurcation discharge ratio; TELEMAC-2D;
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