Title: Experimental and modelling study of flow characteristics on large-scale roughness bed

Authors: Jianmei Zhang; Quan Che; Zhengguo Han; Feng Zhu

Addresses: National Engineering Research Centre for Inland Waterway Regulation, Key Laboratory of Hydraulic and Waterway Engineering of the Ministry of Education, Chongqing Jiaotong University, Chongqing 400074, China ' State Grid Chongqing Electric Power Company, Chongqing 400015, China ' Zhejiang Yu Rui Engineering Consulting Co. Ltd., Hangzhou 310051, China ' CCCC-FHDI Engineering Co. Ltd., Guangzhou 510290, China

Abstract: Large-scale roughness bed flow is a special flow condition which is commonly seen in mountainous rivers. In this paper, gradient flume experiment is carried out with plum-blossom distributed cubic obstruction blocks with 50 mm edge, and large-scale roughness bed flow characteristics including free surface morphology, flow velocity distribution, turbulence propagation and friction head loss coefficient are studied by high-precision measuring and statistical analysis. In addition, CFD based numerical model is established in this paper to verify the experimental results and provide a prediction method to expand the experiment. After that, a modified empirical formula of friction head loss coefficient considering more important influence factors is proposed in this paper based on the experimental results and the numerical simulation results, which provide a practical calculation method of friction head loss coefficient for engineering reference.

Keywords: large-scale roughness; plum-blossom distributed; flow characteristics; numerical simulation; empirical formula.

DOI: 10.1504/IJCAT.2019.102853

International Journal of Computer Applications in Technology, 2019 Vol.61 No.3, pp.166 - 182

Received: 09 Jan 2019
Accepted: 04 Mar 2019

Published online: 30 Sep 2019 *

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