Numerical Research on the Coherent Structure in the Viscoelastic Second-Order Mixing Layers
-
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.Abstract: Numerical 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.
-
[1] C.M.Ho and P.Huerre,Perturbed free shear layers,Ann.Rev.F luid Mech.,16(1984),365-424. [2] M.M.Rogers and D.M.Robert,The three-dimensional evolution of a plane mixing layer:the Kelvin-Helmhotz rollup,J.Fluid Mech.,243(1992),183-226. [3] A.Michalke,On the inviscid instability of the hyperbolic-tangent velocity profile,J.Fluid Mech.,19(1964),543-556. [4] 林建忠,《湍流的拟序结构》,北京:机械工业出版社(1995). [5] M.Hibberd,M.Kwade and R.Scharf,Influence of drag reducing additives on the sructure of turbulence in a mixing layer,Rheol.Acta,21(1982),582-586.
计量
- 文章访问数: 2426
- HTML全文浏览量: 167
- PDF下载量: 469
- 被引次数: 0