中文摘要：

为了获得与近地大气边界层实际脉动风场特征相一致的三维脉动风速,文章首先应用DSRFG（Discretizing and Synthesizing of Random Flow Generation）方法,模拟生成计算流体动力学中大涡模拟算法所需的模拟入口边界脉动风速时程,然后采用改进的动态一方程模型作为大涡模拟的亚格子模型,计算长宽高为1∶1∶3的高层单体矩形建筑在0度风向角下的风荷载分布及特性,并与日本TPU风洞试验进行了对比.结果表明：1当高层建筑长宽比（B/D）=1时,扭矩的能量主要来自涡旋脱落而不是入口湍流的影响;2DSRFG结合改进的动态一方程模型能够较为准确地模拟得到高层建筑表面的平均及脉动风荷载特征.此方法有望应用到实际高层建筑风荷载评估中.

英文摘要：

In order to obtain the time history of 3-dimensional fluctuating wind speed with the same statistical characteristics as the wind of near ground atmosphere boundary layer, an inflow turbulence generation method called DSRFG （ discretizing and synthesizing of random flow generation） is applied to generate the time record of inflow turbulence wind speed for Large Eddy Simulation in CFD, meanwhile an improved dynamic one-equation model is adopted as the sub-grid scale model for Large Eddy Simulation method. These two methods are com- bined for the CFD simulation on the wind load distribution and characteristics of an isolated rectangular tall building with 1：1：3 ratio （the ratio between length, width and height） in zero degree wind direction. The CFD numerical simulation results are further compared with those experimental wind tunnel test results on the same building from TPU wind tunnel laboratory in Japan. All these comparisons indicate that： the fluctuating kinetic energy of wind-induced torsional moment mainly results from the influence of vortex shedding other than the inlet turbulence for the test building; the combination of DSRFG with the improved dynamic one-equation model in the large eddy simulation method in CFD can accurately obtain the value and their characteristics of mean and fluctuating wind loads acting on the isolated rectangular tall building, which jointly testify the feasibility of its application to the design wind load evaluation for actual high rise buildings.