Two-dimensional numerical simulations of flow around a circular cylinder in oscillatory flows at low KC and Reynolds numbers

摘要

For oscillatory flow around a circular cylinder with low Keulegan–Carpenter numbers (KC) and low Reynolds numbers (Re), totally 8 flow regimes were identified previously. Oscillatory flows with KC in the range of 4 to 6 and Re from 100 to 300 are simulated using two-dimensional (2D) numerical simulations based on OpenFOAM. The aim of this study is to examine the capability of the 2D model for capturing the boundaries of regime C in a KC-Re map. The boundaries of regime C is mapped out and compared with experimental results. The comparison shows certain level of discrepancy due to the three-dimensional nature of the flow. However, the key features of the flow agree well with the experimental observation.