湖南大学学报（自然科学版）2012，Vol.39Issue(7)：7-13,7.
钝体矩形断面绕流场机理与主分量分析
Flow Mechanisms around Bluff Rectangular Cylinders and Its Principle Component Analysis
摘要
Abstract
The flow field around a rectangular cylinder with an aspect ratio of 4 was simulated with Reynolds-averaged Navier-Stokes equations combined with SST k-ψ turbulent models, which helped to represent its flow structures and aerodynamic characteristics. The results obtained, including drag coefficient, Strouhal number, mean and fluctuating pressure distribution on cylinder surfaces, averaged vortex shedding location and reattachment length, agreed well with available reports. Through the application of the Principle Component Analysis (PCA) to records of fluctuating pressure on the surfaces, it is found that the first principle component shares the same trends with the RMS distribution of fluctuating pressure, which may be an alternative way to characterize the fluctuating pressure. Based on the configuration of the first principle component, the vortex shedding location on the side surface can be readily located, and the vortex shedding frequency can also be obtained from the coefficients of the first principle. It is highlighted that the main vortex shedding on the side surfaces dominates the features of the fluctuating pressure.关键词
涡脱/矩形断面/CFD/气动特性/PCAKey words
vortex shedding /rectangular cylinders/ CFD/ aerodynamic characteristics/ PCA分类
建筑与水利引用本文复制引用
祝志文,夏昌,邓燕华..钝体矩形断面绕流场机理与主分量分析[J].湖南大学学报（自然科学版）,2012,39(7):7-13,7.基金项目
国家自然科学基金资助项目(50978095) （50978095）
教育部长江学者和创新团队发展计划资助项目(IRT0917) （IRT0917）
