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Abstract:Boundary shear stresses have been calculated for rectangular open channel with different roughnesses using computational fluid dynamics (CFD). CFD simulations were carried out for rectangular free surface flow in order to check the software package for its ability to reproduce experimental results not only for the prediction of the velocity field but also for the shear stress distribution. A research program, therefore, is in progress to study how flows behave in such channels and the 3D numerical simulations can be used systematically to investigate some parameters viz. velocity field, shear stress whole of cross section. The influence of the bottom and side walls roughness on velocity field and shear stress was studied for rectangular turbulent open channel. With the help of the detailed shear stress distribution, sediment transport can be calculated more accurately than using the global shear stress, as is traditionally done.