A study of flow patterns for staggered cylinders at low Reynolds number by spectral element method

作者：Hsu Li Chieh^*; Chen Chien Lin; Ye Jian Zhi

来源：Journal of Mechanical Science and Technology, 2017, 31(6): 2765-2780.

DOI：10.1007/s12206-017-0520-7

• Staggered
• Cylinder
• Spectral element
• Flow pattern

This study investigates the pattern of flow past two staggered array cylinders using the spectral element method by varying the distance between the cylinders and the angle of incidence (alpha) at low Reynolds numbers (Re = 100-800). Six flow patterns are identified as Shear layer reattachment (SLR), Induced separation (IS), Vortex impingement (VI), Synchronized vortex shedding (SVS), Vortex pairing and enveloping (VPE), and Vortex pairing splitting and enveloping (VPSE). These flow patterns can be transformed from one to another by changing the distance between the cylinders, the angle of incidence, or Re. SLR, IS and VI flow patterns appear in regimes with small angles of incidence (i.e., alpha ae<currency> 30A degrees ) and hold only a single von Karman vortex shedding in a wake with one shedding frequency. SVS, VPE and VPSE flow patterns appear in regimes with large angles of incidence (i.e., 30A degrees ae<currency> alpha ae<currency> 50A degrees ) and present two synchronized von Karman vortices. Quantitative analyses and physical interpretation are also conducted to determine the generation mechanisms of the said flow patterns.

• 出版日期2017-6