Numerical modeling of wind flow over different types of topography
Numerical modeling of wind flow over different types of topography
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DOI：
10.1061/40700(2004)169
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发表时间：
2004-05
期刊：
影响因子：
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通讯作者：
G. Bitsuamlak;T. Stathopoulos;C. Bédard
中科院分区：
文献类型：
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作者：
G. Bitsuamlak;T. Stathopoulos;C. Bédard
本文采用计算流体力学（CFD）技术对地形对设计风荷载的影响进行了数值研究。为此目的，CFD工具开发使用面向对象的方法和C++编程语言。计算流体力学程序包括求解雷诺时均NavierStokes方程和标准k-ε湍流模型，采用贴体近正交网格。一个强大的网格生成工具，适用于生产正交网格弯曲和倾斜的复杂表面也已开发。随后，风荷载设计参数，如加速比的值，产生了广泛的地形几何形状，包括悬崖，单一和多个山丘，和山谷。地面粗糙度和几何近似的影响进行了研究。为了验证计算流体动力学结果以及强调特定方法的优点和缺点，对从各种来源获得的结果进行了比较：当前的计算流体动力学研究、边界层风洞（BLWT）实验、现场测量、NBCC（1995）规定、分析方法和文献中现有的以前的数值工作。目前的计算流体动力学结果与BLWT数据进行了比较。加拿大国家建筑规范评注（1995年）为新的和涵盖的案例提供了加速比值。
The paper describes a numerical study about topography effects on design wind load by using Computational Fluid Dynamics (CFD) techniques. For this purpose a CFD tool was developed using an object oriented approach and C++ programming language. The CFD procedure consisted of solving the Reynolds time-averaged NavierStokes equations and the standard k-e turbulence model using body-fitted nearly orthogonal grids. A robust grid generator tool suitable for producing orthogonal grids over curved and sloping complex surfaces has also been developed. Subsequently, wind load design parameters such as speed-up ratio values were generated for a wide spectrum of terrain geometries that included escarpments, single and multiple hills, and valleys. Ground roughness and geometry approximation effects have been investigated. For validation of the CFD results as well as highlighting advantages and disadvantages of a particular method, results obtained from a variety of sources were compared: the present CFD study, Boundary Layer Wind Tunnel (BLWT) experiments, field measurements, NBCC (1995) provisions, analytical methods, and previous numerical works available in literature. The present CFD results compare well with BLWT data. Speed-up ratio values are produced for both new and covered cases by the Commentaries of National Building Code of Canada (1995).