紊流边界层风场半圆屋盖非定常绕流大涡模拟  

LARGE EDDY SIMULATION OF UNSTEADY FLOW AROUND A HEMISPHERICAL ROOF IN A TURBULENT BOUNDARY LAYER WIND FIELD

作　　者：郑德乾 曹志程 张香港 马文勇 ZHENG Deqian;CAO Zhicheng;ZHANG Xianggang;MA Wenyong(School of Civil Engineering,Henan University of Technology,Zhengzhou 450001,China;Huizhou EVE Energy Co.,Ltd.,Guangdong Huizhou 516000,China;School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)

机构地区：[1]河南工业大学土木工程学院,郑州450001 [2]惠州亿纬锂能股份有限公司,广东惠州516000 [3]石家庄铁道大学土木工程学院,石家庄050043

出　　处：《低温建筑技术》2025年第3期36-40,共5页Low Temperature Architecture Technology

摘　　要：文中采用基于空间平均的大涡模拟方法,进行紊流边界层风场内半圆球形屋盖结构的非定常绕流大涡模拟研究。结果表明通过增加雷诺应力分量输入,能在一定程度上改善大涡模拟风场及风荷载预测精度。与平滑流场相比,紊流边界层风场平均风压在迎风面分离区和屋盖顶部附近负压绝对值较小,脉动风压整体较大,其主要原因是来流紊流改变了屋盖表面的流动分离点位置,影响屋盖表面附着涡的能量、尺度以及背风面处的漩涡脱落频率和涡脱范围。研究可为类似结构工程抗风设计提供参考。The study employs a spatially averaged large eddy simulation(LES)method to investigate the unsteady flow around a hemispherical roof structure within a turbulent boundary layer wind field.The results indicate that increasing the input of Reynolds stress components can improve the accuracy of LES wind field and wind load predictions to some extent.Compared to a smooth flow field,the turbulent boundary layer wind field exhibits lower absolute values of mean negative wind pressure in the windward separation zone and near the roof top,while overall fluctuating wind pressure is higher.This is primarily due to the influence of incoming turbulence on the separation point of the roof surface flow,which affects the energy and scale of attached vortices on the roof surface as well as the shedding frequency and range of vortices in the leeward region.This study may provide insights for wind-resistant design of similar structural engineering applications.

关 键 词：半圆球形屋盖 紊流流场 大涡模拟 流动分离点 涡脱范围 

分 类 号：TU312[建筑科学—结构工程]