风沙区涵洞翼墙类型对风沙流输移影响的数值模拟

doi:10.13866/j.azr.2024.12.16

Abstract

Abstract:

A culvert is designed to manage water flow beneath an embankment. However, road culverts often encounter issues with sand accumulation, which disrupts flood flow and jeopardizes road safety. To identify wing wall types that reduce sediment accumulation in culverts, three models were developed—one-sided wall, eight-sided wall, and straight wall. Numerical simulations were conducted to analyze the characteristics of the outflow field and the sediment accumulation processes for each model. The results indicate the following: (1) The structure and velocity of the flow field in the culvert vary significantly based on the wing wall type. In cavities A and B, airflow primarily adheres to the upper wall of the culvert, while in cavity C, the airflow is accelerated. Overall, the velocity in the cavities is ranked as C>B>A. (2) The process of sediment accumulation in the culvert varies significantly based on the wing wall type. Wing walla A and B effectively guide airflow, leading to a high concentration of wind-sand flow within the culvert, making sand accumulation more likely. Conversely, wall C exhibits a weaker diversion ability, accumulating sand primarily at the culvert mouth and shoulder. As incoming wind speed increased, the sand transport capacity of the three culverts improved, with wall C showing the most significant increase, followed by wall B and wall A showing the least. (3) Wind direction also affects sediment accumulation in the culvert. As the oblique angle increased, sediment accumulation in cavities A and C also increased, while sediment accumulation in cavity B decreased. (4) The transport efficiency varies among different wing walls, with sand accumulation in the cavities ranked as A>B>C, while transport efficiency is ranked as C>B>A. Overall, wing wall C was most effective at reducing sand accumulation in the culvert.

Key words: road culvert, flow field distribution, wind-drift sand, numerical simulation

XIA Tian, LI Shengyu, ZHANG Jing, CUI Kejun. Numerical simulation of influence of wing wall type of expressway culvert on transport of wind-blown sand flow in wind-blown sand area[J].Arid Zone Research, 2024, 41(12): 2154-2165.

Figures/Tables 11

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Numerical simulation of influence of wing wall type of expressway culvert on transport of wind-blown sand flow in wind-blown sand area

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