高雷诺数下多柱绕流特性研究

李聪洲; 张新曙; 胡晓峰; 李巍; 尤云祥

doi:10.6052/0459-1879-17-346

高雷诺数下多柱绕流特性研究

doi: 10.6052/0459-1879-17-346

上海交通大学海洋工程国家重点实验室, 上海 200240)
(高新船舶与深海开发装备协同创新中心, 上海 200240

详细信息

作者简介:
null

作者简介：2) 张新曙，教授，主要研究方向：船舶海洋流体力学. E-mail：xinshuz@sjtu.edu.cn

中图分类号: O35;
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出版历程
- 收稿日期: 2017-10-21
- 刊出日期: 2018-03-18

THE STUDY OF FLOW PAST MULTIPLE CYLINDERS AT HIGH REYNOLDS NUMBERS

(State Key Laboratory of Ocean Engineering, Shanghai Jiaotong University, Shanghai 200240, China)
(Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai 200240, China

摘要

摘要: 采用改进的延迟分离涡方法数值模拟了高雷诺数下的柱体绕流,包括单圆柱绕流、单方柱绕流、串列双圆柱绕流和串列双方柱绕流,研究了不同雷诺数下圆柱绕流与方柱绕流的水动力特性. 计算结果与实验数据及其他文献的数值计算结果吻合良好,研究表明,单方柱绕流在 $2.0 × 103 < Re < 1.0 × 107$ 范围内未出现类似于单圆柱绕流的阻力危机现象,其平均阻力系数 $C d ˉ$ 、升力系数均方根 $C' l$ 及斯特劳哈尔数 $St$ 维持在一定范围内波动. 串列双圆柱绕流与串列双方柱绕流中,均选取 $L / D = 2.0$ , 2.5, 3.0, 3.5和4.0这五中间距比进行计算. 串列双圆柱绕流中,当 $Re = 2.2 × 104$ 时,在 $3.0 < L / D < 3.5$ 内存在一临界间距比( $L c / D$ )使得 $L c / D$ 前后上下游圆柱的升阻力系数发生跳跃性变化,且当 $L / D < L c / D$ 时,下游圆柱的阻力系数为负数. 而当 $Re = 3.0 × 106$ 时,则不存在临界间距比,且下游圆柱的阻力系数始终为正数. 串列双方柱绕流在 $Re = 1.6 × 104$ 和 $Re = 1.0 × 106$ 两种工况下的临界间距比分别处于 $3.0 < L / D < 3.5$ 和 $3.5 < L / D < 4.0$ 区间内,且当 $L / D < L c / D$ 时,两个雷诺数下的下游方柱阻力系数均为负数.
- 圆柱绕流 /
- 方柱绕流 /
- 改进的延迟分离涡模拟方法 /
- 高雷诺数
Abstract: Flow past circular cylinders and square cylinders at high Reynolds numbers are simulated by improved delayed detached-eddy simulation (IDDES), including a circular cylinder, a square cylinder, two tandem circular cylinders and two tandem square cylinders. The mean drag coefficient, the RMS values of lift coefficient and the Strouhal number are computed for various Reynolds numbers, which show a good agreement with previous experimental and numerical simulation data. It is found that the effect of Reynolds number on the global quantities for square cylinders is not much in this range of Reynolds numbers, which is different for circular cylinders. There is no drag crisis phenomenon for flow past a square cylinder at $2.0 × 103 < Re < 1.0 × 107$ . The Strouhal number is Reynolds-independent for $Re > 2.0 × 103$ , and the Reynolds-independent is also observed for the mean drag coefficient and the RMS lift coefficient. Simulation for two tandem circular cylinders is performed at Reynolds numbers of $2.2 × 104$ and $3.0 × 106$ for five different spacing $L$ to diameter $D$ ratios: $L / D = 2.0$ , 2.5, 3.0, 3.5 and 4.0. At the critical spacing ( $L c / D)$ there is found a distinct step-like jump of mean drag coefficient and RMS lift coefficient of the subcritical Reynolds number of $2.2 × 104$ , and the mean drag coefficient of the downstream circular cylinder is negative for $L / D < L c / D$ . However, the mean drag coefficient and the RMS lift coefficient are seen to be slightly affected by spacing for $Re = 3.0 × 106$ , and the mean drag coefficient of the downstream circular cylinder is always positive. Flow past two tandem square cylinders is considered at Reynolds numbers of $1.6 × 104$ and $Re = 1.0 × 106$ . The abrupt change in mean drag coefficient and RMS lift coefficient at the critical spacing is clearly seen on both upstream and downstream square cylinders for both Reynolds numbers. When $L / D < L c / D$ , the mean drag coefficient of the downstream cylinder is negative for both Reynolds numbers.
- circular cylinders /
- square cylinders /
- IDDES /
- high Reynolds number

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