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Numerical Experiment for the Estimation of Equivalent Resistance Coefficient for the Simulation of Inundation over Densely Populated Structures  

Kim, Hyeong-Seok (Dept. of Civil Engineering, Hanyang University)
Choi, Jun-Woo (Dept. of Civil Engineering, Hanyang University)
Ko, Kwang-Oh (Dept. of Civil Engineering, Hanyang University)
Yoon, Sung-Bum (Dept. of Civil & Environ. Engrg., Hanyang University)
Publication Information
Journal of Korean Society of Coastal and Ocean Engineers / v.20, no.6, 2008 , pp. 532-539 More about this Journal
Abstract
Kwon et al.(2008) carried out a hydraulic experiment in order to evaluate Manning coefficient, which implicates flow resistance due to bottom friction as well as drag caused by the squared piers higher than water depth and arranged with equal intervals, under the flow condition with a constant drag coefficient, $Re>10^4$. And, based on the equation of equilibrium, they proposed a formula for the equivalent resistant coefficient including empirical drag interaction coefficient obtained by using the experimental results. In this study, the hydraulic experiment was simulated using FLOW-3D, a 3-dimensional computational fluid dynamic code. The computations were compared with the experiment results as well as the semi-theoretical formula, and the comparisons show a good agreement. From the agreement, it was confirmed that when flow resistance bodies were higher than water depth, Manning n value increases with 2/3 power of water depth as shown in the theoretical formula and that drag interaction coefficient was dominated by their intervals.
Keywords
Manning coefficient; equivalent resistance coefficient; drag interaction coefficient; numerical simulation; FLOW-3D;
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