Author(s)

P. Prinos & A. Zeris

Abstract

The characteristics of turbulent flow in open channels with steep slopes are studied numerically. Two low-Re turbulence models of the k-s type are used in the study and are found to reproduce satisfactorily the experimental velocities of Tominaga and Nezu [1] except in the case of very steep slopes (high Fr numbers). They also predict the reduction of the viscous sublayer in supercritical flows but they fail to predict the reduction of the turbulence kinetic energy for such conditions due to their isotropic nature. 1 Introduction Uniform flow in open channels has been studied extensively by various investigators (Nezu and Rodi [2], Cardoso et al [3], among others ) for conditions of small channel slopes and low Froude numbers (subcritical flow). For such condi

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