中国科学院大学学报2026，Vol.43Issue(2)：173-185,13.DOI:10.7523/j.ucas.2024.036
低雷诺数下冷圆柱绕流的数值研究
Numerical study on the flow around a cold cylinder at low Reynolds numbers
摘要
Abstract
This article utilizes three-dimensional numerical simulations on the flow around a cold cylinder with a constant Reynolds number(Re=80)and a Richardson number(Ri)ranging from-5 to-0.5,to investigate the formation mechanism of the wake structure and the influence of buoyancy on the wake structure.The results indicate that within the range of-2.5≤Ri≤-0.5,the wake structure around the cold cylinder exhibits a consistent cyclic pattern due to the influence of buoyancy.As Ri reaches a certain threshold(e.g.,Ri=-5),the cyclic pattern of the cold cylinder flow undergoes a change.With the decrease of Ri,the overall wake structure of the cold cylinder deflects in the direction of gravity,while the number of rib structures exhibits a non-monotonic variation,and the wall-attached flow of the cylinder wake intensifies.When Ri decreases to a certain threshold,flow separation occurs solely from beneath the cylinder.The lift and drag coefficients,along with the Nusselt number on the cylinder's surface,increase monotonically as Ri decreases.关键词
冷圆柱/雷诺数/理查森数/循环模式/流动分离Key words
cold cylinder/Re/Ri/cyclical mode/flow separation分类
数理科学引用本文复制引用
张睿达,陈龙..低雷诺数下冷圆柱绕流的数值研究[J].中国科学院大学学报,2026,43(2):173-185,13.基金项目
国家自然科学基金(52076204,51927812,51776166)资助 （52076204,51927812,51776166）
