Analysis of coherent structures in drag-reducing polymer solution flow based on proper orthogonal decomposition

作     者：CAI WeiHua LI FengChen ZHANG HongNa WANG Yue WANG Lu 

作者机构：School of Energy Science and Engineering Harbin Institute of Technology Harbin 150001 China School of Civil Engineering Harbin Institute of Technology Harbin 150090 China School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin 150090 China 

出 版 物：《Science China(Physics,Mechanics & Astronomy)》 (中国科学：物理学、力学、天文学（英文版）)

年 卷 期：2012年第55卷第5期

页      面：854-860页

核心收录：

学科分类：080704[工学-流体机械及工程] 07[理学] 080103[工学-流体力学] 08[工学] 0807[工学-动力工程及工程热物理] 070602[理学-大气物理学与大气环境] 0805[工学-材料科学与工程（可授工学、理学学位）] 0706[理学-大气科学] 0704[理学-天文学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：supported by the National Natural Science Foundation of China (Grant No.10872060) the Fundamental Research Funds for the Central Universities (Grant Nos.HIT.BRET1.2010008, HIT.NSRIF.2012070) the Doctoral Fund of Ministry of Education of China (Grant No.20112302110020) the China Postdoctoral Science Foundation (Grant No.2011M500652) 

主　　题：coherent structures polymer drag reduction isotropic turbulence proper orthogonal decomposition 

摘      要：Direct numerical simulation(DNS) of forcing homogeneous isotropic turbulence with polymers was *** order to understand the polymers effect on turbulent coherent structures,proper orthogonal decomposition was performed to identify coherent structures based on DNS data,so as to analyze the remarkable difference due to the addition of *** results showed that the numbers for eigenmodes required for capturing coherent structures were 32 and 24 for the Newtonian fluid and polymer solution flows,respectively,which means the decrease of the complexity in polymer solution *** the POD energy spectrum,it was found that the turbulent kinetic energy is distributed onto a large number of eigenmodes whether in the Newtonian fluid flow or polymer solution flow,suggesting that polymer solution flow is still turbulent in one ***,the POD eigenmodes were investigated,which found that the small-scale structures are inhibited in polymer solution flow.