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| 进口来流条件对单体建筑绕流时均流场影响的数值模拟 |
| Numerical simulation of the impact of inlet flow condition on the time-averaged flow field around an isolated building |
| 投稿时间：2021-11-28 |
| DOI：10.13259/j.cnki.eri.2022.04.005 |
| 中文关键词: 单体建筑 数值模拟 进口条件 时均流场 |
| 英文关键词:isolated building numerical simulation inlet condition time-averaged flow field |
| 基金项目:2021年度上海市级大学生创新创业训练计划（SH2021158） |
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| 中文摘要: |
| 数值模拟了6种进口条件下单体建筑物模型附近的时均流场，模拟值与风洞试验值基本吻合，进口时均流参数对速度模拟值的影响较大，进口紊流参数对速度模拟值的影响则较小；当进口时均速度按照试验情况设置但紊流参数不同时，速度模拟值在建筑物前方和顶部几乎无差别，但在建筑物后方，其差别开始显现，且进口紊流参数按近地面情况或试验值设置时的模拟结果相对较好。由于标准k−ε紊流模型对来流动能的耗散模拟过大，导致速度模拟值比试验值略偏小，人为增加近地面动能的进口条件能有效改善上述情况，在依据进口流量确定的进口速度条件下，建筑物附近的速度模拟值与试验值最吻合。 |
| 英文摘要: |
| The time-averaged flow field around an isolated building under six kinds of velocity and turbulent kinetic energy were numerically simulated. The simulated results generally agreed well with the experimental data from wind tunnel. The time-averaged inlet velocity had greater influence on the flow field than the inlet turbulent kinetic energy did. When the time-averaged inlet velocity was set according to the experimental conditions, there were almost no differences in the flow field in the front of and on top of the building. However, some differences appeared in the flow field behind the building. The simulated results were proven better when the inlet turbulent kinetic energy was given according to the conditions near ground or the actual experimental values. Due to overestimation of the kinetic energy dissipation by the standard k-ε turbulence model, the simulated values of velocity were slightly smaller than the experimental results, which could be improved by artificially increasing the kinetic energy near ground. Under the setting inlet velocity, the simulated values of velocity agreed well with the experimental data. |
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