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A numerical simulation on turbulent open-channel flow, which has an aspect ratio (channel width/flow depth) of 6, was conducted by using of a large eddy simulation (LES). In this study, 1-equation model was used. The numerical results of time-averaged mean velocity, Reynolds stress and secondary currents well correspond to the experimental data which were measured by Nezu & Rodi by making use of a laser Doppler anemometer with high accuracy. The instantaneous flow fields in the cross section and horizontal planes were investigated. The instantaneous secondary currents were observed far away from the side-wall. The magnitude of the secondary currents is more than 20% of the streamwise velocity

NUMERICAL STUDY ON A TURBULENT OPEN-CHANNEL FLOW WITH ASPECT RATIO OF 6 BY USING OF LARGE EDDY SIMULATION