頁籤選單縮合
題 名 | Interaction of Oscillatory Flows with a Square Cylinder |
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作 者 | Chern, M. J.; Lu, Y. J.; Chang, S. C.; Cheng, I. C.; | 書刊名 | Journal of Mechanics |
卷 期 | 23:4 2007.12[民96.12] |
頁 次 | 頁445-450 |
分類號 | 332 |
關鍵詞 | Keulegan-Carpenter number; Oscillating flow; Square cylinder; Vortex dynamics; |
語 文 | 英文(English) |
英文摘要 | The behaviour of vortices induced by a single square cylinder in an oscillating flow was investigated. The flow patterns in the vicinity of square cylinders were visualized using an in-house numerical model. Meanwhile, force coefficients exerted on the square cylinder were determined numerically. In terms of various Keulegan-Carpenter (KC) numbers, it turns out that the flow patterns for an oscillating flow past a single cylinder can be divided into three modes: (i) no vortex, (ii) pairs of symmetric vortices, and (iii) asymmetric vortex shedding. Reynolds (Re) number did not affect the flow field apparently in this study. In addition, the in-line force coefficient decreases exponentially as KC increases. Spectrum analysis of in-line force coefficients for various KCs was provided. It can be found that the flow system was at a periodic state at small KC for the first two modes. Variations of the flow system from a periodic state to a highly nonlinear state in which asymmetric vortex shedding appeared were demonstrated for increasing KC. The relationship between the in-line force and KC was provided for future applications. Keywords : Keulegan-Carpenter number, Oscillating flow, Square cylinder, Vortex dynamics. |
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