基于CFD模型的城市地下三维承灾体洪水演进特性研究  

Research on Flood Characteristics of Three-dimensional Urban Underground Disaster Bearing Bodies Based on Computational Fluid Dynamics

作　　者：蔡钊 刘宏伟[1] 储少志 闵星[1] CAI Zhao;LIU Hong-wei;CHU Shao-zhi;MIN Xing(Nanjing Hydraulic Research Institute,Nanjing 210029,China)

机构地区：[1]南京水利科学研究院,江苏南京210029

出　　处：《水电能源科学》2025年第4期26-29,共4页Water Resources and Power

基　　金：国家重点研发计划(2022YF03090600)。

摘　　要：城市化地区由于错综复杂的地下三维空间特性,在洪涝灾害发生后是主要承灾体之一,然而现有对城市化地区的洪涝模拟研究,基本集中于一维或二维的淹没研究,无法真实反映城市洪涝灾害发生后地下承灾体空间内的水位、水流流速的变化情况。因此,利用计算流体力学模拟模型,构建和模拟了地下三维承灾体空间的概化模型和地下空间模型,结果发现在单层地下空间水流高流速区域集中在水流入口附近,并会在地下空间较大范围内形成回流区域,而双层地下空间的高流速区域基本集中在空间入口处及双层空间的连接处,可见在洪涝灾害发生前期需注意地下空间入口处,以及灾害发生中期,地下空间的连接处的高流速区域对行人及重要建筑物可能会产生影响。研究结果可为地下空间洪涝灾害发生后灾害链推演,以及地下空间人员疏散等灾害应对提供重要参考。Due to the complex three-dimensional urban underground spatial characteristics,the main disaster bearing bodies were urbanized underground areas after the flood disasters occur.However,previous flood simulation studies in urbanized areas have mainly focused on one-dimensional or two-dimensional research,which cannot truly reflect the changes of water level and water flow velocity in the underground disaster bearing body space after urban flood disasters occur.Therefore,this study used computational fluid dynamics simulation models to construct and simulate a generalized model and underground space model of the three-dimensional underground disaster bearing bodies.The results show that in a single-layer underground space,the high velocity area of water flow is concentrated near the water flow inlet of the underground space,and a reflux area will be formed over a large range of underground space.In a double-layer underground space,the high velocity area is mainly concentrated at the space inlet and the connection of the double-layer space.In the early stage of flood disasters,attention should be paid to the impact of the high velocity area of the underground space connection on pedestrians and important buildings in the middle stage of disasters.The research results can provide important references for the disaster chain deduction after the occurrence of underground space floods,as well as disaster response such as personnel evacuation in underground spaces.

关 键 词：计算流体力学 城市洪涝 三维承灾体 概化模型 

分 类 号：TV122.1[水利工程—水文学及水资源] P333.2[天文地球—水文科学]