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并列旋转双圆柱流动特性的数值模拟
  • 期刊名称:水动力学研究与进展 A辑 2009
  • 时间:0
  • 分类:TV131.2[水利工程—水力学及河流动力学]
  • 作者机构:[1]中国计量学院,杭州310018
  • 相关基金:国家自然科学基金(10872188/A020414)
  • 相关项目:流向振荡柱体尾流不稳定性的控制
中文摘要:

该文基于k-ε湍流模型,采用Galerkin有限元法对并列旋转双圆柱的绕流特性进行了数值模拟,计算的雷诺数为1550。为了考查两圆柱旋转和间距的相互作用,文中采用三种间距比分别是T/D=1.2,1.6和3.0(T为两圆柱中心之间的距离,D为圆柱直径)和一系列不同的旋转速度比(|α|≤2)。计算显示,当|α|=0,即圆柱不转动时,对应三种间距有三种典型的流型,单钝体流型对应小间距、偏流对应中等间距和对称流对应大间距;当|α|达到临界值时,涡脱落得到了有效的抑制,流动趋于稳定,升力系数和阻力系数的脉动值趋于零;平均升力系数和阻力系数随着|α|的增大分别增大和减小。

英文摘要:

Flow around two rotating side-by-side circular cylinders in a cross flow was numerically simulated using Galerkin finite element method based on k-ε turbulent model. In order to investigate the combined effects of the rotating and the spacing between two circular cylinders, the numerical simulations were performed at a various range of absolute rotating speeds (|α|≤2) for three spacing ratios T/D = 1.2, 1.6 and 3.0 (T is the transverse distance between the centers of two circular cylinders, D is the diameter of the circular cylinders.) at Reynolds number of 1550. In the case of |α|= 0, three classic flow patterns are obtained: single bluff-body vortex shedding at small T/D, biased flow at intermediate T/D and synchronized vortex shedding at larger T/D. As |α| being beyond the critical rotational speed, vortex shedding was completely suppressed, the flow becomes steady and the fluctuation of lift and drag coefficients tend to zero. The mean values of lift and drag coefficients increase and decrease respectively with increasing lal.

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