同济大学学报（自然科学版）2025，Vol.53Issue(5)：677-685,9.DOI:10.11908/j.issn.0253-374x.23335
切角率对方柱绕流特性的影响规律及其机理
Effects of Chamfer Ratio on Flow Around a Square Cylinder and Their Mechanism
摘要
Abstract
This study investigates the aerodynamic performances and flow patterns of square cylinders with various chamfer ratios(0,1/14,1/7,and 2/7)using the large-eddy simulation(LES)method.The analysis is conducted at Reynolds number of 2.2×104,with a uniform inflow condition and different incidence angles.Similar to the flow past a standard square cylinder,the chamfered square cylinders exhibit three distinct flow patterns as the incidence angle increases:the"leading-edge separation mode",the"separation bubble mode",and the"attached flow mode".As the chamfer ratio increases,the square cylinders exhibit a general trend of decreasing mean drag coefficient and an increasing Strouhal number.At small incidence angles(α<10°),square cylinders with higher chamfer ratios experience significant reductions in both the mean land fluctuating lift coefficients.However,at large incidence angles(α>25°),the square cylinder with a larger chamfer ratio(2/7)has a higher lift coefficient compared to the standard square cylinder.The mean drag coefficient and fluctuating lift coefficient of the square cylinder reach their minimum values near the critical incidence angle between the leading-edge separation and separation bubble modes,while the mean lift coefficient and the Strouhal number reach their maximum values.As the chamfer ratio increases,the wake width of the square cylinders in different incidence angles generally narrows.However,the variation in the strength of the wake vortices is more complex.关键词
方柱/切角率/大涡模拟/气动性能/流动机理Key words
square cylinder/chamfer ratio/large-eddy simulation(LES)/aerodynamic characteristic/flow mechanism分类
土木建筑引用本文复制引用
杜晓庆,毕研钊,方立文,董浩天..切角率对方柱绕流特性的影响规律及其机理[J].同济大学学报（自然科学版）,2025,53(5):677-685,9.基金项目
国家自然科学基金(52478534 （）
51978392 （）
52008239),桥梁结构抗风技术交通行业重点实验室开放课题基金(KLWRTBMC24-02) （KLWRTBMC24-02）
