Numerical and Experimental Approaches to Estimate Discharge Coefficients and Energy Loss Coefficients in Pressurized Grated Inlets

Numerical models concerning inlet systems are run to assess the hydraulic performance of existing or new and estimate flow interchanges between surface overland sewer flows. In most programs, these interactions modelled using orifice equation, with estimated discharge coefficients around 0.6. this paper, values energy loss for several pressurized grated inlets were obtained by experimental numerical approaches compared. To achieve goals, a model replicating tests carried out at laboratory Universitat Politècnica de Catalunya (UPC) was produced CFD (Flow 3D). This found be highly sensitive mesh size used; however, it able accurately simulate processes. The comparison considered different combinations though grate, 10 50 l/s, longitudinal gradients. coefficient increase surcharging flowrate (ranging from 0.14 0.41), whereas gradient have no effect. in study show that standard 0.6 value commonly used practitioners should revised range 0.41, depending on circulating type. addition, 0.25 3.41.