建筑物表面压力分布预测仿真研究

摘要

Research on accurate calculation of surface pressure distribution for high-rise building is very important. Aim at practical application of computational wind engineering, in order to get suitable turbulence model and numeration method to calculate accurately the pressure distribution, the surface pressure distribution of cubic—building was calculated with modified atmospheric boundary layer, different turbulence models and coarse mesh. By comparison and analysis based on experiments, it is found that there is an error for the surface pressure distribution prediction of RANS and DES models, while the LES result is better. The numerical result shows that LES can gain accurate data with coarse mesh and appropriate boundary condition, which offers some references and bases for complex project computation.%研究高层建筑物表面压力分布的准确预测问题.针对工程的实际应用,由于建筑物与风之间的相互作用加在建筑物上,使建立压力分布的准确预测模型较为困难.为得到准确预测建筑物表面压力分布的模型,采用风场给定的大气边界层入口条件,使用不同湍流模型和粗化网格,对立方体建筑物表面压力分布进行计算.分析发现,与测试结果相比雷诺平均和分离涡模型在立方体建筑物表面压力系数计算偏差较大,而大涡仿真计算结果吻合度较好.仿真结果表明,给定合适边界条件和计算方法,使用粗化网格的大涡模拟计算能够得到准确的压力系数计算结果,可以为更加复杂的工程实际计算提供参考和应用依据.