管道内泥沙粗颗粒冲淤过程的数值模拟

Numerical Investigation of Coarse Sediment Particle Self-cleaning Process in a Pipe

近年来,我国城市暴雨洪涝灾害不断加剧,为建立更为完善的城市管道自净系统,对城市排水管道水力清淤的研究愈发重要。该文基于颗粒离散元法和点球浸没边界法对管道内泥沙粗颗粒冲淤过程进行模拟,首先采用三个算例对(CgLES_Ycode)代码模型进行验证,随后研究了不同流速条件下管道内泥沙颗粒运动,讨论了沉积沙床的侵蚀情况和冲淤效果,最后将模拟的现象结合工程手册进行了分析。

In recent years,Urban rainstorm and flood disasters are continually aggravating in China.In order to establish a better urban pipeline self-cleaning system,the research on hydraulic desilting of urban drainage pipeline is becoming increasingly important.This paper simulates the self-cleaning process of coarse sediment particles in a pipe based on the particle discrete element method and point-particle immersion boundary method.Firstly,three numerical examples are used to verify the correctness of this code model(cgles_ycode).Then,the movement of sediment particles in a pipe under different velocity conditions is studied,while the erosion and self-cleaning process of sediment bed are detailly discussed.At last,the simulated phenomenon is analyzed by comparing with the relevant engineering manual.