FENE-P流体混合层中拟序结构的研究  

Research on Coherent Structures in a Mixing Layer of the FENE_P Polymer Solution

作　　者：邵雪明[1] 林建忠[1] 余钊圣[1] 

机构地区：[1]浙江大学力学系,杭州310027

出　　处：《应用数学和力学》2001年第3期259-266,共8页Applied Mathematics and Mechanics

基　　金：教育部博士点基金资助项目 !(980 33511

摘　　要：采用FENE_P模型对高雷诺数下二维粘弹性混合过程中拟序结构的演变进行了数值研究·　由于对聚合物应力场采用了适当的滤波措施 ,得到了较AH更宽参数范围内FENE_P流体混合层流场中拟序结构的运动特性 ,计算结果表明 :在流场中加入聚合物 ,基波和次谐波的发展受到抑制 ,涡量扩散加强 ,减慢了配对时两涡核的旋转运动 ,这种影响随Weissenberg数的增大而减小 ,但却随参数b的增大而加强·　另外 ,与相同溶液粘度下的牛顿流体相比 ,配对过程中涡量完全合并的时刻延迟了·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 wil cause stronger vorticity diffusion, accompanied with weaker fundamental and subharmonical perturbations and slower rotational motion of neighboring 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 viscoelatic mixing layer compared with the Newtonian one of the same total viscosity.

关 键 词：混合层 拟序结构 FENE-P模型 拟谱方法 FENE-P流 

分 类 号：O357.52[理学—流体力学]