Reynolds number dependence of flow past a shallow open cavity  

作　　者：CHEN Huai ZHONG Qiang WANG XingKui LI DanXun 

机构地区：[1]State Key Laboratory of Hydroscience and Engineering, Tsinghua University

出　　处：《Science China(Technological Sciences)》2014年第11期2161-2171,共11页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.51127006)

摘　　要：Measurements were carried out in a shallow open cavity with particle image velocimetry technique.The cavity has a lengthto-depth ratio of 4:1,and the upstream inflow conditions include laminar,transient,and turbulent regimes at seven different Reynolds numbers.The measured instantaneous velocities were analyzed through ensemble average,vortex extraction,and proper orthogonal decomposition(POD)to investigate overall flow circulations,Reynolds stress distribution,spanwise vortex population,and the characteristics of the POD modes.The results reveal distinctive Reynolds number dependence of the cavity flow,e.g.an increase in Reynolds number results in constant migration of the overall circulation,enhancement of Reynolds stress,reduction of correlation between vortex and Reynolds stress,and decrease of fractional energy of the characteristic POD modes.Finally,a phenomenological model was proposed to describe various features of cavity flow.

关 键 词：cavity flow Reynolds number Reynolds stress spanwise vortex particle image velocimetry 

分 类 号：O35[理学—流体力学]