Simulation on Flood Disaster in Urban Building Complex System Based on LBM

doi:10.16182/j.issn1004731x.joss.22-FZ0930

Abstract

Abstract:

Because of the extreme climate change, the potential flood disaster risk in the southeast coastal areas of China can not be ignored. Based on lattice Boltzmann computational fluid dynamics method, a three-dimensional simulation study of waterlogging process in tsunami impact scenario is carried out for a coastal city building complex system, and the reliability and accuracy of the numerical simulation method for the flood impact test of an ideal building complex are verified. The results show that the buildings along rivers and coastlines have obvious cloaking effect, while the buildings inside the city are less affected by floods. The layout direction and spacing distribution of buildings have obvious influence on flood paths. The small-scale simulation analysis method of urban buildings under large-scale flood scenarios solves the problems that two-dimensional models can't calculate complex flow field, topography, and turbulence, and overcomes the difficulty of three-dimensional grid division of buildings. It can provide provides technical references for flood disaster emergency management and urban building planning based on urban information model.

Key words: lattice Boltzmann method(LBM), urban buildings, waterlogging disaster, computational fluid dynamics, tsunami, flooding

CLC Number:

TV131.2

Shen Zhang, Zewang Yang, Yifan Wang, Liang Sun, Ming Cheng, Fankai Meng, Ting Li. Simulation on Flood Disaster in Urban Building Complex System Based on LBM[J]. Journal of System Simulation, 2022, 34(12): 2584-2594.

Figures/Tables 12

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Table 1

Simulation parameter setting of ideal city

参数	量值
计算模型	自由液面
壁面模型	加强型壁面
壁面粗糙度/m	$1.62 × 10 - 8$
计算控制	库朗数=1
基本格子尺寸/m	0.02
加密区格子尺寸/m	0.01

Table 1

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