基于本征正交分解的并列双圆柱绕流尾流场分析  

Proper Orthogonal Decomposition of Flow Past Parallel Twin Cylinders

作　　者：王军辉 田书玲[1] WANG Jun-hui;TIAN Shu-ling(College of Aerospace Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)

机构地区：[1]南京航空航天大学航空学院空气动力学系,江苏南京210016

出　　处：《气体物理》2023年第4期46-54,共9页Physics of Gases

摘　　要：并列双圆柱绕流尾流场流动复杂,在不同的间距下会呈现多种复杂尾迹模式。基于有限体积方法,针对低Reynolds数Re=200下不同间距并列二维双圆柱绕流流动开展了数值模拟研究,并采用本征正交分解(proper orthogonal decomposition,POD)法对仿真得到的尾流场进行模态对比分析。分析结果表明:间距g=1.5 m时,上下两圆柱间干扰较弱,尾迹呈现周期性同步同向模式;间距g=0.35 m时,上下两圆柱间干扰较强,流动现象较为复杂,尾迹呈现交替翻转模式,流场不再具有明显周期性规律。同时POD方法能得到尾流流动在空间上的主要分布特征,较少的模态包含流场的绝大部分能量,且间距g=1.5 m的尾流模态结构较间距g=0.35 m的模态结构更加紧凑有序,这和不同间距g下的尾流流动形态密切相关。The wake flow field around the parallel twin cylinders is complex,and a variety of complex wake patterns appear at different spacings.In this paper,based on the finite volume method,a numerical simulation of the flow around two-dimensional parallel cylinders with different spacings at low Reynolds number Re=200 was carried out.The flow field was ana-lyzed by modal comparison.The analysis results show that the proper orthogonal decomposition(POD)method can obtain the main characteristics of the dynamic system in space,and fewer modes contain most of the energy of the flow field.When the distance g=1.5 m,the interference between the upper and lower cylinders is weak,and the wake presents a periodic synchronous and co-directional pattern.When the distance g=0.35 m,the interference between the upper and lower cylinders is strong,and the flow phenomenon is more complicated.The wake presents an alternate flip pattern,and the flow field no longer has obvious periodic regularity.At the same time,the POD method can obtain the main spatial distribution chara-cteristics of the wake flow,with fewer modes containing most of the energy of the flow field,and the wake modal structure with a spacing of g=1.5 m is more compact and orderly than the modal structure with a spacing of g=0.35 m,which is closely related to the wake flow patterns under different spacing g.

关 键 词：圆柱绕流 尾迹 数值模拟 本征正交分解 模态 

分 类 号：V211.3[航空宇航科学与技术—航空宇航推进理论与工程]