Numerical simulation method for analyzing energy dissipation effect of flood diversion tunnel outlet stilling basin

Abstract

The invention discloses a numerical simulation method for analyzing the energy dissipation effect of a flood diversion tunnel outlet stilling basin, which comprises the following steps: firstly, building design data such as an outlet section of the flood diversion tunnel, the stilling basin, an apron and a riprap are collected; a two-dimensional mathematical model of a stilling pool and a downstream local river channel is established by utilizing mike21 software according to collected relevant design data of the outlet section of the flood diversion tunnel, the stilling basin, the apron, the riprap, a downstream river channel and the like, a model grid type adopts an unstructured grid, and the grid size is subjected to regional encryption processing according to the stilling basin body type. The stilling basin two-dimensional mathematical model established by mike21 software is used for simulating and calculating the energy dissipation effects of stilling basins in different body types, the method is simple in modeling and high in calculation speed, the defects that time and labor are wasted in modeling and modification of a traditional physical model test, and the data measurement accuracy is influenced by manual operation and a measuring instrument are overcome, the working efficiency of the model test is improved, the working cost is reduced, and the result can provide a scientific basis for the optimization design of the stilling basin.

Description

technical field [0001] The invention belongs to the technical field of flood discharge of water conservancy projects, and in particular relates to a numerical simulation method for analyzing the energy dissipation effect of a stilling basin at the outlet of a flood diversion tunnel. Background technique [0002] Some cities are surrounded by mountains. In the rainy season, floods and mountain torrents converge quickly. After the mountain torrents flow through the downstream plains in the basin, they merge with the floodwaters in the plains and are discharged into the main river or the sea through drainage channels and sluices. With the continuous development of cities, the The requirements for flood control and drainage are also increasing. In order to ensure the safety of urban flood control and drainage, it is necessary to build a new urban flood control system. [0003] At present, many cities are building flood diversion tunnels to alleviate the pressure of urban flood c...

AI Technical Summary

Problems solved by technology

At present, the physical model test can be used to judge the water flow pattern and energy dissipation effect of the stilling pool more intuitively. However, the establishment of the physical model takes a long time and requires high costs, especially when the body shape needs to be modified. Time and cost The problem is particularly prominent. In addition, the energy of the water flow in the stilling pool area is large, and the movement of the water flow in the pool changes drastically. The accuracy of data measurement is affected by manual operation and measuring instruments.

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