【作者】 汤树勇；

【导师】 唐锦春； 陈水福；

【作者基本信息】 浙江大学 ， 结构工程， 2003， 硕士

【摘要】 本文主要研究建筑风场数值模拟的二维区域的网格剖分、自动加密和风场模拟计算问题。二维问题的计算区域，沿来流风取一长方形区域，采用有限体积法进行网格剖分和数值离散。网格剖分时，首先将计算区域划分为紧靠建筑物表面的内层区域和离建筑物较远处的外围区域。为适应不同建筑体型的需要，本文提出在内层区域布置贴体的任意四边形网格，而在外围区域布置直角坐标矩形网格的分层网格离散模式。 内、外两层区域的网格自动生成，先将各区域划分为数量较少的四边形超单元，然后对各超单元逐个剖分。在对初始网格进行初步的流场计算的基础上，根据计算结果对网格进行自动加密，直到流场模拟结果达到规定的精度要求。 为了实现上述功能，编制了相应的计算程序。采用计算程序对几种不同体型建筑物的流动风场进行了模拟计算，给出了计算区域的网格剖分和加密结果，获得了离散后的流场的风速和风压模拟结果，并与风洞试验结果进行了比较。网格剖分和数值模拟结果表明，采用本文方法生成的网格格式简单，网格质量高，适应性强，适用于多种体型建筑物的模拟计算，并且风场模拟结果与风洞试验结果有较好的吻合。更多还原

【Abstract】 The discretization,grid refinement and numerical simulation of two-dimensional computation domain of wind load on buildings are dealt with in this thesis. The computation domain is a rectangular area with its length along the along-wind direction. A finite volume scheme is proposed during the process of domain discretization and numerical simulation. In this scheme,the computational domain is first divided into two sub-domains,inner domain near the building’s surface and outer domain far away from the building. In order to deal with different kinds of building shapes,body-fitted quadrilateral grids are arranged in the inner domain and rectangle girds in the outer domain.The grid auto-generation of the inner and outer domains is carried out by generating a small number of quadrilateral super elements and each super element then further discretized into smaller elements. Based on the computational results for the initial grid division,the adaptive grid refinement is introduced until meeting the required accuracy.The computer program is established for implementing the aims described above. Using the program the wind fields around several buildings with different body shapes are analyzed. The final results of grid division and refinement are presented. The final wind velocities around the building and wind pressures on the building surface are obtained and also compared with those from the wind runnel test. It is indicated that the grids generated by the proposed method are simple,high quality and suitable for different building shapes,and the results of numerical simulation agree well those of the wind tunnel test.更多还原