THREE-DIMENSIONAL NUMERICAL MODELING OF SECONDARY FLOWS IN A WIDE CURVED CHANNEL  

作　　者：HUANG Sui-liang JLA Ya-fei CHAN Hsun-Chuan WANG Sam S. Y. 

机构地区：[1]Numerical Simulation Group for Water Environment, Key Laboratory of Pollution Processes and Environmental Criteria of Ministry of Education, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China [2]National Centre for Computational Hydroscience and Engineering, The University of Mississippi, Carrier Hall 102, University, MS 38677, USA

出　　处：《Journal of Hydrodynamics》2009年第6期758-766,共9页水动力学研究与进展B辑（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant No.50479034);the Natural Science Foundation of Tianjin (Grant No.09YFSZSF02100);the financial support of the USDA Agriculture Research Service under Specific Research Agreement (Grant No. 58-6408-2-0062)(monitored by the USDA-ARS National Sedimentation Laboratory);the US State Department Agency for International Development under Agreement (Grant No.EE-G-00-02-00015-00) and the University of Mississippi

摘　　要：Most natural rivers are curved channels, where the turbulent flows have a complex helical pattern, as has been extensively studied both numerically and experimentally. The helical flow structure in curved channels has an important bearing on sediment transport, riverbed evolution, and pollutant transport study. In this article, different turbulence closure schemes i.e., the mixing-length model and the k-ε model with different pressure solution techniques i. e., hydrostatic assumptions and dynamic pressure treatments are applied to study the helical secondary flows in an experiment curved channel. The agreements of vertically-averaged velocities between the simulated results obtained by using different turbulence models with different pressure solution techniques and the measured data are satisfactory. Their discrepancies with respect to surface elevations, superelevations and secondary flow patterns are discussed.Most natural rivers are curved channels, where the turbulent flows have a complex helical pattern, as has been extensively studied both numerically and experimentally. The helical flow structure in curved channels has an important bearing on sediment transport, riverbed evolution, and pollutant transport study. In this article, different turbulence closure schemes i.e., the mixing-length model and the k-ε model with different pressure solution techniques i. e., hydrostatic assumptions and dynamic pressure treatments are applied to study the helical secondary flows in an experiment curved channel. The agreements of vertically-averaged velocities between the simulated results obtained by using different turbulence models with different pressure solution techniques and the measured data are satisfactory. Their discrepancies with respect to surface elevations, superelevations and secondary flow patterns are discussed.

关 键 词：3-D numerical modeling curved channels secondary flow patterns EXPERIMENTS 

分 类 号：O357[理学—流体力学] TU457[理学—力学]