杜晓庆　陈丽萍　董浩天　田新新　许汉林

摘   要：為了研究干扰条件下方柱的风压特性及其流场机理，以串列双方柱为研究对象，采用大涡模拟方法，在雷诺数Re = 8 × 104、间距比P/B = 1.1 ～ 5的条件下，研究了两个方柱的风压系数、气动力系数、风压非高斯特性、风压相关性随间距比的变化规律，重点探讨了双方柱流场特性及其与风压非高斯特性的内在联系. 研究结果表明：随着间距比的增大，串列双方柱依次表现为3种流态，即单一钝体、剪切层再附和双涡脱流态，风压特性与流态密切相关. 风压的非高斯特性和风压相关性随流态变化呈现为3种类型：在单一钝体流态下，柱间回流区附近的表面风压呈现明显的非高斯特性且风压相关性较强;在剪切层再附流态下，方柱尾流的涡脱强度低，风压相关性弱，但风压非高斯区域大;在双涡脱流态下，受上游方柱尾流旋涡的作用，方柱侧风面的风压相关性较强，下游方柱的侧风面和背风面出现大范围的风压非高斯区域.

关键词：串列双方柱;气动干扰;大涡模拟;风压非高斯特性;流场机理

中图分类号：TU 311                                 文献标志码：A

Wind Pressure Characteristics and Flow Mechanism

of Two Tandem Square Columns

DU Xiaoqing1，2，CHEN Liping1，DONG Haotian3?，TIAN Xinxin1，XU Hanlin1

（1. Department of Civil Engineering，Shanghai University，Shanghai 200444，China;

2. Wind Engineering and Aerodynamic Flow Control Research Center，Shanghai University，Shanghai 200444，China;

3. School of Mechanics and Engineering Science，Shanghai University，Shanghai 200444，China）

Abstract：To study the wind pressure characteristics and flow mechanism of square columns due to flow interference，taking the tandem square columns as the research object，large eddy simulation method is applied under the condition that Reynolds number Re = 8 × 104 and spacing ratio P/B=1.1～5. The influences of spacing ration on wind pressure coefficient，aerodynamic coefficient，non-Gaussian feature of wind pressure，and wind pressure correlation of the columns are discussed. The relationship between flow pattern and non-Gaussian characteristics of wind pressure is revealed. The results show that three major regimes are distinguished along with various spacing ratios，namely single bluff-body regime，shear layer reattachment regime and co-shedding regime，which are closely related with the specific wind pressure patterns. In the single bluff-body regime，the wind pressure near the recirculation zone between two columns shows significant non-Gaussian feature，whose correlation of wind pressure is strong. The shear layer reattachment regime，however，shows a weak vortex shedding in near wake，accompanied by a small wind pressure correlation but a large region of non-Gaussian wind pressure. Finally，in the co-shedding regime，due to vortex shedding of the upstream cylinder，the wind pressure on the side surface of two columns has a strong correlation and there is a large region of non-Gaussian wind pressure on the side and leeward surfaces of the downstream cylinder.

Key words：tandem square columns;aerodynamic interference;large eddy simulation;non-Gaussian features of wind pressure;flow mechanism

群体超高层建筑之间存在复杂的气动干扰现象，这使得群体建筑的风荷载与单体建筑有很大差異. 影响群体超高层建筑风荷载的因素众多，如来流风特性、建筑体型、建筑数量、建筑间距、高宽比、风向角等，情况非常复杂[1-5]，其流场干扰机理有待研究.

风压的非高斯特性是超高层建筑围护结构抗风设……