Abstract
Sedimentation commonly occurs in urban drainage systems, disrupts flow, and is one of the major causes of inundation. The complicated phenomena that alter the cross-section of sewer conduits include transportation, precipitation, and sedimentation, and need to be analyzed for the proper design and efficient maintenance of urban drainage systems. In this study, the discharge capacity of urban drainage systems is simulated and analyzed by considering the pattern of flow of sediments in sewer conduits through a numerical analysis model. The sites of the highest and lowest accumulation of soil were examined as sedimentation occurred, as was discharge due to accumulation in sewer conduits. The purpose of this study is the examination of mathematical models for two-phase fluid flow analysis and the prediction of sedimentation in urban sewer conduits. An expression for the height of the sedimentation was obtained to assess the discharge capacity of urban drainage systems, and a model to predict accumulation in sewer conduits was developed using non-dimensional variables for inlet velocity, inlet particle volume fraction, and particle size. When subjected to linear regression analysis, the model yielded a high correlation coefficient (R2) of 0.899. This satisfied the aims of this study, to obtain a higher discharge capacity and a plan for the design of urban drainage systems.
Highlights
A large amount of research has been conducted on sediment disasters in urban drainage systems.In addition to an analysis of the characteristics of soil erosion in the watershed, a description of the internal phenomena has emerged as important
Causes of urban inundation have been examined from various viewpoints, and the volume of sedimentation inside sewer conduits has been highlighted as a major problem
A river can be used for sediment deposition and transport analysis based on a variety of observed data
Summary
A large amount of research has been conducted on sediment disasters in urban drainage systems. It is challenging to obtain data on sediment transport and sedimentation in urban drainage systems because sediment flow in sewer conduits is very unstable [4,5,6]. There is no application of two-phase flow for the sediment transportation in urban sewer conduits. An ANSYS-Fluent numerical model, a solver of computational fluid dynamics (CFD) models, was applied for analysis It is among the most widely used commercial CFD solvers in practical and academic research in mechanical and industrial engineering [21,22,23]. The effects of inlet velocity, the size of soil particles, the volume fraction of soil, the flow characteristics of the water mixture, and soil distribution inside the conduits were numerically investigated by using a two-phase mixture model. A flow chart of the analysis procedure is shown Figure 2
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