并列切角方柱风致干扰效应的大涡模拟研究  

Interference effect of side-by-side chamfered square cylinders by large eddy simulation

作　　者：李方慧[1] 张智博 张特 范佳红 尚靖淳 LI Fanghui;ZHANG Zhibo;ZHANG Te;FAN Jiahong;SHANG Jingchun(School of Civil Engineering,Heilongjiang University,Harbin 150080,China)

机构地区：[1]黑龙江大学建筑工程学院,黑龙江哈尔滨150080

出　　处：《哈尔滨工程大学学报》2024年第3期599-606,共8页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(51778492);2022年度黑龙江省省属高等学校基本科研业务费项目。

摘　　要：针对并列切角高层建筑间的干扰影响问题,本文采用大涡模拟方法研究雷诺数22 000的均匀流场下并列切角(切角率10%)方柱的干扰效应。基于模型的网格收敛性分析及模型准确性验证,对比分析不同间距比下并列切角方柱的气动干扰效应和流场分布,并探寻风压干扰效应的影响规律和形成机理。结果表明:对于并列切角方柱,平均阻力系数主要呈放大效应,脉动升力系数主要呈减小效应。在并列切角方柱处于小间距(B/L=1.2)时,由于风与壁面的相互作用,产生风压力,风压力与方柱表面力叠加,对正压区域产生加强效果,表现为放大效应,对负压区域进行削弱,出现减小效应;当B/L=1.5时,结构干扰最剧烈,其中相邻立面后流场的切角处放大效明显,干扰因子最大值为2.58;当B/L≥4.0时,除相邻立面外的其他立面与切角干扰效应趋于消失;当B/L=8.0时,相邻立面仍然存在28%的放大效应。Considering the Reynolds number of 22000,the large eddy simulation method is used to study the interference effect of side-by-side chamfered square cylinders with a chamfer angle of 10%under the condition of uniform flow field.This was done with the goal of identifying the interference effect of side-by-side high-rise buildings with chamfered corners.Based on the grid convergence analysis of the model and the validation of the accuracy of the model,the aerodynamic interference effect and the flow field distribution of side-by-side chamfered square cylinders with different spacing ratios were analyzed,and the influence law and formation mechanism of wind pressure interference effect were explored.The results revealed that for the side-by-side chamfered square cylinders,the average drag coefficient mainly showed an amplification effect,while the fluctuating lift coefficient had a reduction effect.When side-by-side chamfered square cylinders were at a small interval(B/L=1.2),the interaction between wind and the wall produced wind pressure,and the superposition of wind pressure and the surface force of square columns produced a strengthening effect on the positive pressure area,which manifested as an amplification effect.At the same time,the region of negative pressure was weakened,and a decreasing effect appeared.When B/L=1.5,the structure interference was the most severe,among which the amplification effect was obvious at the corner of the flow field behind the adjacent facades,with the maximum value of the interference factor being 2.58.When B/L≥4.0,the interference effect of facades(other than the adjacent ones)and chamfer angles disappeared.Finally,when B/L=8.0,28%amplification still existed in adjacent facades.

关 键 词：并列切角方柱 大涡模拟 均匀流场 气动干扰效应 流场分布 风压干扰效应 阻力系数 放大效应 

分 类 号：TU312[建筑科学—结构工程]