RESEARCH ON COHERENT STRUCTURES IN A MIXING LAYER OF THE FENE-P POLYMER SOLUTION  

作　　者：邵雪明 林建忠 余钊圣 

机构地区：[1]Department of Mechanics, Zhejiang University, Hangzhou 310027, P R China,State Key Laboratory of Fluid Transmission and Control, Hangzhou 310027, P R ChinaPaper from LIN Jian-zhong, Member of Editorial Committee, AMM [2]Department of Mechanics, Zhejiang University, Hangzhou 310027, P R China

出　　处：《Applied Mathematics and Mechanics(English Edition)》2001年第3期304-311,共8页应用数学和力学（英文版）

基　　金：theDoctoralFoundationofEducationMinistryofChina!( 980 335 11)

摘　　要：The evolution of the coherent structures in a two-dimensional time-developing mixing layer of the FENE-P fluids is examined numerically. By the means of an appropriate filtering for the polymer stress, some characteristics of the coherent structures at high b were obtained, which Azaiez and Homsy did not address. The results indicate that adding polymer to the Newtonian fluids will cause stronger vorticity diffusion, accompanied with weaker fundamental and subharmonical perturbations and slower rotational motion of neighbouring vortices during pairing. This effect decreases with the Weissenberg number, but increases with b. In addition, the time when the consecutive rollers are completely coalesced into one delays in the viscoelastic mixing layer compared with the Newtonian one of the same total viscosity.The evolution of the coherent structures in a two-dimensional time-developing mixing layer of the FENE-P fluids is examined numerically. By the means of an appropriate filtering for the polymer stress, some characteristics of the coherent structures at high b were obtained, which Azaiez and Homsy did not address. The results indicate that adding polymer to the Newtonian fluids will cause stronger vorticity diffusion, accompanied with weaker fundamental and subharmonical perturbations and slower rotational motion of neighbouring vortices during pairing. This effect decreases with the Weissenberg number, but increases with b. In addition, the time when the consecutive rollers are completely coalesced into one delays in the viscoelastic mixing layer compared with the Newtonian one of the same total viscosity.

关 键 词：mixing layer coherent structures FENE-P model pseudo-spectral method 

分 类 号：O357.5[理学—流体力学]