Prediction system for wind loading on building and structure with complex configuration

计算流体力学（CFD）技术作为一种复杂的风荷载预测方法，有望为建筑结构的抗风设计提供合理的依据。一个实际的建筑具有复杂的形状，并且在城市中被其他不同形状的建筑所包围。钝体（如建筑物和结构）的空气动力学很容易受到外形细微变化的影响。因此需要对复杂构型上的气动力进行仔细的估计，而这种假设往往不能很好地发挥作用。在这种情况下，我们应该用适当的方法测量每个结构上的单个气动力。与实验方法相比，CFD可能在预测各种形状的物体上的力方面具有优势。在本研究中，我们开发了基于CFD技术的建筑物和复杂结构风荷载预测系统。特别是处理湍流效应对风荷载的预测具有重要意义。本文成功地模拟了紊流边界层中建筑物周围的风场，为建筑物的抗风设计提供了数值方法。

CFD (Computational Fluid Dynamics) technique is recently expected as a sophisticated method for prediction of the wind loading, which definitely has a possibility to rationalize the wind resistant design for a building an a structure. An actual building has a complex shape and is surrounded by other buildings with different shape in the city. Aerodynamics of a bluff body such as a building and a structure tend to be easily affected by a delicate change of the configuration. So it is required to carefully estimate the aerodynamic forces on complex configuration and the presumption usually does not work well. In this case, we should measure individual aerodynamic forces on each configuration by an appropriate method. CFD probably has an advantage to predict the forces on various shapes of body, compared to the experimental method. In this study, we develop the prediction system based on CFD technique for wind loading on a building and a structure with complex configuration. Especially it is important for the prediction of wind loading to deal with turbulence effect. This study succeeds in simulating the wind flow around a building in the turbulent boundary layer and provides useful information of wind resistant design by numerical method.