文档介绍：华中科技大学
硕士学位论文
基于FLUENT软件的建筑物风场数值模拟
姓名:黄滢
申请学位级别:硕士
专业:结构工程
指导教师:卫军
20051022
摘要
超高大跨度和轻质建筑物中结构对风作用的敏感性大大增强风荷载成为此
类建筑物控制设计的主要荷载之一如何计算风对建筑物的作用已成为理论与工程界
关注的热点问题
风对建筑物的作用属于复杂钝体绕流问题建筑物周围的风流场是十分复杂的湍
流场充满了分离回流旋涡等一系列复杂的运动形式理论方法还难以解决这一
复杂的流动问题而试验研究又存在着费时费力花费较高及适用性不强等问题
随着湍流模型的不断发展和完善计算机软硬件的飞速进步及计算技术的迅速提高
用计算机模拟风洞试验的技术日趋成熟已逐渐成为结构风工程研究的最有力手段
本文正是利用这一方法对建筑物周围风场进行研究以得到风对建筑物的作用
本文阐述了计算风工程的基本理论和计算方法推导出了三维稳态二阶迎风格式
下控制方程的离散方程对建筑物周围风场数值模拟时涉及到的计算流域确定网格
划分边界条件选取参考压力位置确定湍流模型选择求解参数设置等问题进行
了深入研究对选用方法原则提出了有益建议利用计算流体动力学软件 FLUENT
对某大型复杂三维建筑物考虑周围建筑物气动干扰作用的情况进行了周围风流场模
拟详细比较了结构各部分的计算平均风压值与风洞试验值利用软件所得数据推导
换算得到的计算均方根风压系数值与风洞试验值进行了比较最后详细分析了计算值
与试验值间存在差别的原因通过具体工程分析表明数值模拟是可靠的采用计算流
体动力学方法进行建筑物风荷载的计算是可行的
关键词计算风工程数值模拟湍流模型平均风压值均方根风压系数
I
Abstract
The wind effects on the construction, such as super high-rise buildings, the long span
spatial structures and light weight buildings, are largely strengthened. So wind load is the
one of principal loads in the controlled design to these buildings. How to calculate wind
effect on the buildings is one of the hot issues in the both the theory and engineering
domains.
The question of wind effects on the buildings belongs to the flow around bluff body.
The flow-field around the buildings is plicated, which is filled with series of
complicated movements, such as separation, circulation, vortices etc. It is difficult to solve
plicated flow problem in theory. On the other hand, there are also many
ings for test methods, such as long period, hard work, expensive cost and weak
adaptability. With the sustained development of turbulence model, as well as the surprising
advancement of software, hardware putation methods, the numerical simulation
technique to the wind tunnel tests has gradually e mature, and it will have been the
strongest means in the wind engineering. So in this paper the flow-field of the buildings is
studied by this method in order to find wind effects on the buildings.
The