粘弹性二阶流体混合层流场拟序结构的数值研究  

Numerical Research on the Coherent Structure in the Viscoelastic Second-Order Mixing Layers

作　　者：余钊圣[1,2] 林建忠[1,2] 

机构地区：[1]浙江大学力学系流体传动及控制国家重点实验室 [2]浙江大学力学系杭州应用工程技术学院

出　　处：《应用数学和力学》1998年第8期671-677,共7页Applied Mathematics and Mechanics

基　　金：国家自然科学基金

摘　　要：本文用拟谱方法对随时间发展的二维粘弹性二阶流体混合层流场进行了直接数据值模拟，给出在高雷诺数和低Ｄｅｂｏｒａｈ数下大涡的卷起、配对和合并等过程，通过与相同雷诺数下牛顿流体的比较，揭示了弱粘弹性对混合层中大涡拟序结构演变的影响·umerical simulations have been performed in time-developing plane mixing layers of the viscoelastic second-order fluids with pseudo-spectral method. Roll-up, pairing and merging of large eddies were examined at high Reynolds numbers and low Deborah numbers. The effect of viscoelastics on the evolution of the large coherent structure was shown by making a comparison between thesecond-order and Newtonian fluids at the same Reynolds numbers.

关 键 词：数值模拟 拟序结构 粘弹性流体 混合层流场 

分 类 号：O357[理学—流体力学]