Numerical Simulation of Three‐Dimensional Sediment Transport in an Inverted Siphon Pipeline for Engineering Safety

Abstract Inverted siphon pipelines are widely used in hydraulic engineering, and their operational safety is closely related to sediment transport. To study the sedimentation patterns in the inverted siphon during long‐term operation, this paper constructs a single‐hole computational model of the inverted siphon and performs three‐dimensional transient numerical simulations of sediment transport in the inverted siphon using the Eulerian solid‐liquid two‐phase flow model. The sediment distribution and sediment transport dynamics inside the inverted siphon under different operating conditions are analyzed. The results indicate that sediment primarily accumulates at the bottom of the horizontal section of the pipeline, with the least sedimentation occurring under the increased flow condition and the most significant under the special flow condition. The sediment deposition under design and increased flow conditions is notably delayed compared to the special flow conditions, with greater fluctuations in sediment concentration over time. These findings provide an important reference value for the study of the sediment transport law in the inverted siphon pipelines and offer scientific evidence and contribute to enhancing disaster resilience and improving the overall safety of water conveyance systems.