Análisis CFD del porcentaje de disipación de energía en rápidas escalonadas con flujo rasante para caudales pluviales de las zonas norte, centro y sur de la cuidad de Quito

Abstract

The study evaluates semi-empirically and numerically the skimming flow behaviour and energy dissipation of three proposed stepped chutes for peak storm flows in southern, central and northern areas of Quito. An algorithm was developed to technically design the proposed structures by semi-empirical expressions, evaluating the percentage of energy dissipation and corroborating the consistency of these results with those obtained from a CFD numerical analysis. The results obtained show a similarity between the percentage of energy dissipation obtained in the numerical simulation and that calculated theoretically/semiempirically for the proposed flow rates (Q1 = 12.35 m3/s, Q2 = 11.71 m3/s, Q3 = 6.83 m3/s). A correct development of the skimming flow, aeration phenomenon, location of the inception point and similar theoretical-numerical remaining energy was verified. Some limitations were observed in the semi-empirical algorithm for small flow rates that lead to poor aerated flow development. Nevertheless, this study represents a contribution to the pre-design of stepped structures with skimming flow for various flow rates and terrain conditions.