Abstract
In this study, we use a lattice Boltzmann method with a multi-relaxation-time model to simulate dam-break flooding in confluence channels with four confluence angles. Compared with physical experiment, the simulation proves reliable. We analyze the influence of the confluence angle on the propagation of dam-break flood. The stage hydrograph at the confluence area can be divided into four stages: before the wavefront reaches—rising rapidly—falling gradually—planarization with periodic fluctuation. The water depth of the measuring points in the confluence area is influenced by two factors: the confluence angle and the distance from the measuring point to the first impact point. The results demonstrate that the backwater effect of the confluence is enhanced at higher confluence angles. As the confluence angle increases, the first impact point moves upstream. Moreover, there is a strong backwater effect close to the first impact point, resulting in superelevation mainly occurring in the confluence area.
Highlights
Dam-break is a disaster that occurs extremely suddenly and is highly destructive
Researchers have focused on the flow characteristics of supercritical flow at channel junctions for several decades, mainly using physical model testing3–5 and computational fluid dynamics (CFD) simulation
The latter has taken the form of onedimensional numerical simulations,6 three-dimensional numerical simulations based on finite-volume discretization,7 and smoothedparticle hydrodynamics (SPH) based on the Lagrange method
Summary
Dam-break is a disaster that occurs extremely suddenly and is highly destructive. Cities on junctions and downstream are threatened by dam-break floods, rendering it crucial to forecast flood routes quickly and accurately, to send out disaster warnings, and evacuate people in time.. Researchers have focused on the flow characteristics of supercritical flow at channel junctions for several decades, mainly using physical model testing and computational fluid dynamics (CFD) simulation. The latter has taken the form of onedimensional numerical simulations, three-dimensional numerical simulations based on finite-volume discretization, and smoothedparticle hydrodynamics (SPH) based on the Lagrange method.. Yang et al summarized the effects of various turbulence models for three-dimensional flow simulations of confluence. The latter has taken the form of onedimensional numerical simulations, three-dimensional numerical simulations based on finite-volume discretization, and smoothedparticle hydrodynamics (SPH) based on the Lagrange method. To improve simulation accuracy, Yang et al summarized the effects of various turbulence models for three-dimensional flow simulations of confluence.
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