Modelling of Surcharge Flow Through Grated Inlet

Alvarez, Jackson David Tellez; Gómez, Manuel; Russo, Beniamino

doi:10.1007/978-981-15-5436-0_65

Cited by 2 publications

(2 citation statements)

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“…Flow 3D has applications in a variety of fields, as it is capable of simulating a large range of different fluids [55][56][57][58][59]. For three-dimensional incompressible flows, the governing equations behind Flow 3D are summarized in Equations ( 3)-( 6):…”

Section: Numerical Modelmentioning

confidence: 99%

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

et al. 2021

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

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Section: Numerical Modelmentioning

confidence: 99%

“…The turbulence model used is RNG, as it gives better performance when compared with other models [57]; the equations used are (7) and ( 8):…”

Section: Numerical Modelmentioning

confidence: 99%

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

et al. 2021

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Discharge coefficients to be used in inlet hydraulics

Gómez,

Tellez-Alvarez,

Russo

2024

Proceedings of the Institution of Civil Engineers - Water Manag

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Urban pluvial floods can be produced or exacerbated by an insufficient density of inlets or by their poor hydraulic efficiency. Therefore, proper consideration of the hydraulic performance of inlets is essential to guarantee the correct functioning of urban drainage systems during heavy storm events. Recent advances in computational analysis in the field of hydrodynamics modelling allow the use of the well-known concept of dual drainage for design and planning purposes by simulating flow transfers between the surface layer (streets) and underground layers (sewers) through a proper hydraulic characterisation of inlet efficiency. Powerful commercial software packages allow simulations of flow transfer and use different approaches and formulas. Many of these approaches include the possibility of treating a sewer inlet as an orifice. In this context, this paper presents a methodology to obtain orifice discharge coefficients for three inlets previously tested at the hydraulics laboratory of the Technical University of Catalonia. Discharge coefficients of 0.18–0.58 were obtained for Froude numbers of 1.12–4.40, quite far from the usual recommended values. The proposed procedure can also be applied to non-tested grates.

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Modelling of Surcharge Flow Through Grated Inlet

Cited by 2 publications

References 10 publications

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

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

Discharge coefficients to be used in inlet hydraulics

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