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Turbulence and Shear Flow Phenomena -1 First International Symposium

ISBN:
1-56700-135-1 (Print)

EVALUATION OF MODIFIED k−ε MODELS IN SIMULATING 3D FLOWS OVER SUBMERGED SPUR DIKES

Jing Peng
Department of Hydraulics, China Institute of Water Resources and Hydropower Research 1A Fuxing Road, Beijing 100038, CHINA

Yoshihisa Kawahara
Department of Social and Environmental Engineering, Graduate School of Engineering, Hiroshima University 1-4-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8527, Japan

Guangwei Huang
Department of Civil Engineering, The University of Tokyo Hongo, Bunkyo-ku, Tokyo 113-8656, JAPAN

Abstract

A three-dimensional numerical model incorporating a k−ε type of turbulence model was developed for flows in open channels with submerged spur dikes. The applicability of the standard k−ε model, three modified linear models and a nonlinear model were tested for two different flows. Comparison among these models with the experiments showed that the modified k−ε models reproduce the turbulence quantities better than the standard model and that the nonlinear model can achieve more accurate predictions. The superiority of the nonlinear model over the linear models is attributed to its more accurate approximation of Reynolds stresses, and hence improved calculation of turbulent eddy viscosity around spur dikes.