Evaluación numérica tridimensional de un sumidero de reja de fondo (Three-Dimensional Numerical Assessment of Grate Inlet)

10 Pages Posted: 31 Jan 2018

See all articles by Manuel Cárdenas-Quintero

Manuel Cárdenas-Quintero

National University of Colombia

Luis F. Carvajal-Serna

National University of Colombia

Ramiro Marbello-Pérez

National University of Colombia

Date Written: November 30, 2017

Abstract

Spanish Abstract: Se realizaron múltiples simulaciones del proceso de captación de agua en el sumidero Tipo B de las Empresas Públicas de Medellín (EPM E.S.P.), a partir de un modelo hidrodinámico tridimensional (Ansys – CFX). Se utilizó un dominio virtual de una vía de 3.0 m de ancho y 5.30 m de largo, variando los caudales de entrada de 50 a 250 l/s, la pendiente longitudinal de 0.1 a 10% y la pendiente transversal de 0 a 5%, generando 105 casos simulados. Los resultados del modelo numérico se compararon con aproximaciones empíricas que representan el proceso de captación en sumideros de reja de fondo, logrando correlaciones satisfactorias. El caudal total captado, se desagregó en el caudal captado por los mecanismos frontal y lateral y se definieron diferentes coeficientes de descarga tipo vertedero y orificio para el caudal captado frontalmente y tipo vertedero para el caudal captado lateralmente. Además, se propone un umbral de potencia unitaria del flujo de aproximación en la reja analizada, para identificar si el proceso de captación frontal es tipo vertedero u orificio. Estos coeficientes fueron evaluados en una segunda reja (Tipo A de EPM E.S.P.), ajustándose notablemente a los modelos empíricos disponibles.

English Abstract: Multiple simulations of water catchment process were carried out in the Type B grate stablished by Empresas Públicas de Medellín (EPM E.S.P.), using a three-dimensional hydrodynamic model (Ansys – CFX). A highway virtual domain of 3.0 m wide and 5.3 m long was used, changing the input flow values from 50 to 250 l/s, the longitudinal slope from 0.1 to 10% and the transverse slope from 0 to 5%, generating 105 cases. The results of the numerical model were compared with empirical approachs which represent the catchment process in a grate, obtaining satisfactory correlations. The total captured flow was separated in the flow captured by frontal and side mechanisms and several discharge coefficients were defined, such as weir and orifice type for frontal flow and weir type for lateral flow. Furthermore, in order to identify if the front catchment process is weir or orifice type, a unitary power threshold for the approximation flow in the analyzed grate was proposed. These coefficients were evaluated in a second grate (EPM E.S.P. Type A), adjusting remarkably to the available empirical models.

Note: Downloadable document is in Spanish.

Keywords: Urban Drainage, Grate Inlet, Computational Fluid Dynamic (CFD)

Suggested Citation

Cárdenas-Quintero, Manuel and Carvajal-Serna, Luis F. and Marbello-Pérez, Ramiro, Evaluación numérica tridimensional de un sumidero de reja de fondo (Three-Dimensional Numerical Assessment of Grate Inlet) (November 30, 2017). Ibero-American Seminar on Water and Drainage Networks (SEREA 2017). Available at SSRN: https://ssrn.com/abstract=3112980 or http://dx.doi.org/10.2139/ssrn.3112980

Manuel Cárdenas-Quintero (Contact Author)

National University of Colombia ( email )

Carrera 30 45-03
Bogota, None
Colombia

Luis F. Carvajal-Serna

National University of Colombia ( email )

Carrera 30 45-03
Bogota, None
Colombia

Ramiro Marbello-Pérez

National University of Colombia ( email )

Bogotá
Colombia

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