基于分离涡方法的TTU标准低矮建筑风压特性研究  

Research on the wind pressure for the detached eddy simulation of standard low-rise building TTU model

作　　者：戴成元 张浩 刘宇杰 Dai Chengyuan;Zhang Hao;Liu Yujie(Cllege of Civil and Archiecure Engineering,Guilin University of Technology,Guilin 541004,China;School of Cinil Engineering,Guangzhou 510006,China)

机构地区：[1]桂林理工大学土木与建筑工程学院,广西桂林541004 [2]广州大学土木工程学院,广州510006

出　　处：《建筑科学》2021年第7期7-13,26,共8页Building Science

摘　　要：本文以TTU标准低矮建筑模型为研究对象,分别采用Standard k-ε、RNG k-ε、Realizable k-ε以及分离涡模型对低矮建筑周边风场进行数值模拟。为较好满足大气边界层的自保持性要求,对RANS模型底部和顶部边界条件进行修正,确保建筑物与大气相互作用时来流条件基本保持不变,并由新的湍流脉动流场生成方法DSRFG模拟风场的湍流边界条件。在定常与非定常风场下分别计算分析不同湍流模型下低矮建筑周围的风场及风压分布规律,并将数值模拟结果与WERFL实测数据以及TJ-2风洞试验数据进行对比,验证了计算结果的可靠性。结果表明:RANS模型能够模拟出结构周围流场的一般特性,但对流场的湍流特性模拟效果不佳;相比RANS模型,分离涡模型能够较好地模拟出流场的湍流分布及结构背风处涡旋的分离脱落情况,模拟结果可为低矮建筑抗风设计方法提供论证依据。TTU standard low-rise building model is taken as the research object,the rigid model is established,the numerical simulation is carried out with the Standard k-ε,RNG k-ε,Realizable k-ε and detached eddy simulation model. In order to better meet the self-retention requirements of the atmospheric boundary layer,the bottom and top boundary conditions of the RANS model are revised. A new inflow turbulence generator called discretizing and synthesizing random flow generation is applied to simulate the actual inflow boundary conditions of turbulent flow field. Under steady and unsteady wind fields,the wind pressure distribution around the building is calculated respectively and analyzed. The different turbulence models for low-rise building wind field and the influence of wind pressure distribution are discussed. The simulation results are compared with the recorded field data of WERFL and the wind tunnel test data of Tongji University to verify the reliability of the calculation results.The results show that although the RANS model can simulate the general characteristics of the flow field around the structure,but the simulation effect of the turbulence characteristics of the field is not good. The detached eddy simulation model can better simulate the turbulence distribution of the flow field and the separation and shedding of the vortex at the structure’s leeward,which can provide a reference for the wind resistance design of low-rise building structures.

关 键 词：低矮建筑 分离涡 风压 数值模拟 TTU 

分 类 号：TU312.1[建筑科学—结构工程]