粘弹性二阶流体混合层流场拟序结构的数值研究

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基金项目: * 国家自然科学基金

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

1.
Department of Mechanics, State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, P. R. China

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.
- 混合层 /
- 粘弹性二阶流体 /
- 数值模拟 /
- 拟谱方法 /
- 拟序结构
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.
- mixing layer /
- viscoelastic second-order fluids /
- numerical simulation /
- pseudo-spectral method /
- coherent structure

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