Experiments and Numerical Analysis of Flow in an Open Channel with Gravel Bed

Proceedings

Kasiteropoulou, Dorothea¹  Keramaris, Evangelos²  Michalolias, Nikolaos³  Liakopoulos, Antonios⁴ 

[1] Author to whom correspondence should be addressed.;Department of Civil Engineering T.E, Alexander Technological Educational Institute of Thessaloniki, Sindos, 57400 Thessaloniki, Greece;Department of Civil Engineering, University of Thessaly, PedionAreos, 38334 Volos, Greece;Presented at the 3rd EWaS International Conference on “Insights on the Water-Energy-Food Nexus”, Lefkada Island, Greece, 27–30 June 2018

关键词: open channel flow;    gravel bed;    PIV Measurements;    numerical simulation;    turbulent velocity profiles;   

DOI  :  10.3390/proceedings2110581

学科分类：社会科学、人文和艺术（综合）

来源: mdpi

【 摘 要 】

In this study laboratory experiments and numerical simulations of flow in an open channel with gravel bed of 2 cm thickness are presented and compare. The experimental results were obtained using 2D Particle Image Velocimetry (PIV). For the numerical simulation of gravel bed, a porous layer of thickness 2 cm and appropriate porosity (ε = 0.80, volume of fluid over total porous medium volume) was used. In order to validate the results of the CFX based numerical model, computed quantities are compared with experimental data from PIV measurements. Vertical distributions of velocity above the permeable layer are presented for different total flow depths. The determination of the velocity profiles is of practical importance in the design of open channels. The findings are supported by both laboratory measurements and numerical modelling results and can be useful for engineering applications. In all cases there is a good agreement between experimental and numerical results.

【 授权许可】

CC BY