Numerical Study for Open-channel Flow over Rows of Hemispheres

Important parameters in the study of design criteria for sewer pipes are related to shear velocity. The aim of this paper is to obtain a numerical model which does not require significant computational resources and that is feasible for the calculation of shear velocity. We created a numerical model in a free surface flow over artificial roughness elements represented by hemispheres. The numerical model is designed to be identical with an experimental model previously studied. We have investigate velocity and vorticity fields and the distribution of turbulent stresses using a SST k-ω model.