| 平衡大气边界层自保持问题的研究 |
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| 引用本文： | 唐煜,郑史雄,赵博文,李明水.平衡大气边界层自保持问题的研究[J].工程力学,2014,31(10):129-135. |
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| 作者姓名： | 唐煜 郑史雄 赵博文 李明水 |
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| 作者单位： | 西南交通大学风工程试验研究中心,成都 610031 |
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| 基金项目： | 国家自然科学基金项目(51378443);国家973项目(2013CB036300);交通运输部西部课题项目(201231835250) |
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| 摘 要： | 在计算风工程(CWE)中,实现大气边界层(ABL)来流边界条件的自保持是基本前提条件,然而在很多已发表的文献中这一基本要求被忽视或未得到满足。该文首先回顾了已有研究者对该问题的研究进展,基于SST k-ω湍流模型和平衡湍流假设,推导了适用于一般风工程计算的入口来流边界条件表达式,并结合作者的工作经验给出了适用于地形尺度风场计算的湍流模型常数建议值。随后通过三维平坦场地数值模拟检验所生成风剖面的自保持特性,效果理想。最后对实际山地地形风场进行建模计算,所得结果与现场实测数据基本吻合。
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| 关 键 词： | 计算风工程 三维风场数值模拟 平衡大气边界层 SST k-ω 湍流模型 入流边界条件 自保持 |
| 收稿时间： | 2013-04-25 |
NUMERICAL INVESTIGATION ON THE SELF-SUSTAINING OF EQUILIBRIUM ATMOSPHERE BOUNDARY LAYERS |
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| Affiliation: | Research Centre for Wind Engineering, Southwest Jiaotong University, Chengdu 610031, China |
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| Abstract: | The self-sustaining equilibrium of inflow boundary conditions for atmosphere boundary layers (ABL) is a precondition for computational wind engineering (CWE). However, this basic requirement has been neglected or unsatisfied in many published studies. This paper first reviews the state-of-the-art of this problem. Subsequently, inflow boundary conditions for general CWE are derived based on the SST k-ω turbulence model and the assumption of equilibrium turbulence. Values for key turbulence model closure coefficients are proposed for wind field simulation on the scale of topography. A three-dimensional (3D) wind field simulation was conducted with a flat topography, and the wind velocity profile demonstrated a satisfactory level of self-sustaining. Finally, the wind field of a mountainous topography is simulated and results show good agreement with field measurement. |
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