计算流场尺寸对风压系数影响的研究

计算流体动力学（CFD）技术已成为研究建筑结构风压系数的有效手段之一，但合理的风场构筑理论和构筑方法是准确模拟建筑结构风场的基础，对此研究成果不多。基于CFD软件，建立了单体方形建筑有限元分析模型，通过改变三维流场特征尺寸，研究了单体建筑物在不同流场断面高度、宽度，来流、尾流长度等尺寸效用下结构表面风压特征及风压系数变化规律。结果表明：流场高度主要影响迎风面的风压系数，流场宽度的变化主要影响结构迎风面以及结构两侧的风压系数分布，流场长度的影响集中在迎风面和背风面。研究结果可为此类建筑物合理使用数值风洞提供参考。

RESEARCH ON THE EFFECT OF DIFFERENT FLOW FIELDS ON WIND PRESSURE COEFFICIENTS

Computational Fluid Dynamics has become one of the most effective means of investigating wind pressure coefficient of structures. However the research on reasonable flow field construction theory and methods are always neglected. In this paper, wind pressure coefficient were simulated by using CFD software and achieved the characteristics of the structural planes under different flow. The results show that different height flow field will affect the structural wind pressure coefficients on the windward side, different width flow fields always affect the structural wind pressure coefficients on the windward side and both sides of structure. The effect of different length mainly focus on the windward and leeward. The results aim to offer reference for the rational usage of numerical wind tunnel about these building structure.