An investigation of flow over side weir by numerical model

Side weirs are one of the most important and sensitive parts of flood water spreading systems. Their inappropriate or incorrect function can potentially have an adverse effect on an entire whole system making it difficult for flood water spreading systems to perform correctly. Hence it is necessary to study the hydraulic behavior of the side weir. One of the applications of side weirs is predicting the accurate flow measurement in irrigation and floodwater spreading systems. In this study, the flow over a broad crested side weir is numerically investigated based on experimental data under subcritical condition. The numerical model considers flow over side weir using RANS (Reynolds’s Average Navier-Stokes) equations. The standard k-ε turbulence was used to account for turbulence modeling and the volume of fluid (VOF) scheme was also used in the model to find free surface of flow. The simulation results were validated by experimental data. They provided detailed analysis of flow pattern, longitudinal pressure distributions and transverse volume of fluid of flow over the side weir. This study shows that existing numerical models using RANS are useful in design of side weirs. The FLUENT 6.3.26 software was employed to conduct this numerical simulation work.Reza Namaee Mohammad. An investigation of flow over side weir by numerical model . In: SimHydro 2014. New Trends in Simulation. 11-13 June 2014 Ecole Polytech’ Nice (France) 2014