Numerical investigation of the flow characteristics around two sequential cylinders with circular and square cross-sections

IF 2.7 4区工程技术 Q2 ENGINEERING, CIVIL Journal of Marine Science and Technology Pub Date : 2024-01-27 DOI:10.1007/s00773-024-00987-4

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Abstract

Many efforts have been dedicated to examining the flow characteristics around a pair of cylinders. Despite the straightforward geometry, the flow dynamics around a cylinder prove to be intricate. The practical applications of this phenomenon extend across various engineering domains, including oil and gas transmission lines, heat exchangers, pipelines, and the construction of successive skyscrapers. The current investigation delves into the examination of the critical distance ratio, fluctuating velocity, flow pattern, and drag surrounding two sequential circular and square cylinders. The governing equations are solved using the finite volume method (FVM). For momentum, turbulent kinetic energy, and turbulent dissipation rate equations, the upwind second-order discretization is used. The findings, acquired at a Reynolds number of 32,000 for distance ratios ranging from 0.25 to 10, are then compared with those from single-cylinder cases. The results highlight the significant influence of both geometry and the distance between cylinders on the observed flow patterns. The critical distance ratio is obtained as \(s_{c}\) = 2 and 2.5 for the case of two sequential circular and square cylinders, respectively, while for the case of combined circular and square cylinders, it is calculated as \(s_{c}\) = 3. The non-dimensional fluctuating velocity decreases by 7%, 26%, and 38% in the case of two sequential circular cylinders with distance ratios of S* = 1, 2, and 3 at the first station, respectively, compared to a single circular cylinder. The drag coefficient is 50% lower in the two sequential circular and square cylinders case compared to the single square cylinder.

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两个圆形和方形截面连续气缸周围流动特性的数值研究

摘要很多人致力于研究一对圆柱体周围的流动特性。尽管几何形状简单明了，但圆柱体周围的流动动力学却错综复杂。这种现象的实际应用遍及各个工程领域，包括油气输送线、热交换器、管道和连续摩天大楼的建造。本次研究深入探讨了临界距离比、波动速度、流动模式以及两个连续圆形和方形圆柱体周围的阻力。治理方程采用有限体积法（FVM）求解。对于动量、湍流动能和湍流耗散率方程，采用了上风二阶离散法。在雷诺数为 32,000 时，距离比从 0.25 到 10 不等，得出的结果与单气缸情况下的结果进行了比较。结果凸显了几何形状和气缸间距对观察到的流动模式的重要影响。在两个连续圆筒和方筒的情况下，临界距离比分别为 \(s_{c}\) = 2 和 2.5，而在圆筒和方筒结合的情况下，临界距离比计算为 \(s_{c}\) = 3。与单个圆形圆筒相比，两个连续圆形圆筒在第一站的距离比 S* = 1、2 和 3 的情况下，非维度波动速度分别降低了 7%、26% 和 38%。与单个方形圆筒相比，两个连续圆筒和方形圆筒的阻力系数降低了 50%。

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来源期刊

Journal of Marine Science and Technology 工程技术-工程：海洋

CiteScore

5.60

自引率

3.80%

发文量

审稿时长

7.5 months

期刊介绍： The Journal of Marine Science and Technology (JMST), presently indexed in EI and SCI Expanded, publishes original, high-quality, peer-reviewed research papers on marine studies including engineering, pure and applied science, and technology. The full text of the published papers is also made accessible at the JMST website to allow a rapid circulation.