振荡来流中静止圆柱的低雷诺数绕流模拟

刘鑫, 张冠华, 于利辉, 于梦洋, 包东明, 战庆亮

doi:10.16411/j.cnki.issn1006-7736.2024.04.015

大连海事大学学报 >

2024 , Vol. 50 >Issue 4: 135 - 143

DOI: https://doi.org/10.16411/j.cnki.issn1006-7736.2024.04.015

振荡来流中静止圆柱的低雷诺数绕流模拟

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(1.大连海事大学交通运输工程学院，辽宁大连 116026；2.辽宁省交通科学研究院有限责任公司，沈阳 110000；3.运通交通科技(大连)有限公司智能流体研发中心, 辽宁大连 116023)

刘鑫（1998 — ），男，硕士生，研究方向：海洋工程。战庆亮*（1987 — ），男，博士，讲师，E-mail： zhanqingliang@163.com。

网络出版日期: 2024-05-22

基金资助

大连海事大学博联科研基金资助项目（3132023619）；交通行业重点实验室开放课题（KLWRTBMC21-02）

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Simulation of low Reynolds number flow around a stationary cylinder in oscillating inflow

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(1.College of Transportation Engineering, Dalian Maritime University, Dalian 116026, China; 2.Liaoning Transportation Research Institute Co., Shenyang 110000,China; 3.Smart Fluid Research Center, Yuntong Transport Technology Company, Dalian 116023, China)

Online published: 2024-05-22

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摘要

针对非零均值振荡来流情况，开展低雷诺数圆柱绕流模拟，研究不同振荡周期下结构的受力区别和流场形态差异。首先，基于自主研发的水下流场模拟软件zFlower开发了非定常来流下的入流边界条件模块；在均匀来流且充分发展的流场基础上，开展了高、低两种频率比的振荡来流模拟，得到振荡来流条件下圆柱的受力状态与流场的演化过程。结果表明，来流频率较高时，振荡来流会影响流动的涡脱形态，圆柱所受横向力峰值较大；来流频率较低时，结构受到的横向作用力绝对值变化不明显，但是作用力的频谱复杂，有可能更易激发结构的流致振动。

关键词： 振荡来流; 流场形态; 非定常绕流; 低雷诺数; 圆柱绕流

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刘鑫, 张冠华, 于利辉, 于梦洋, 包东明, 战庆亮 . 振荡来流中静止圆柱的低雷诺数绕流模拟[J]. 大连海事大学学报, 2024 , 50(4) : 135 -143 . DOI: 10.16411/j.cnki.issn1006-7736.2024.04.015

Abstract

A low Reynolds number flow simulation around a cylinder for non-zero mean oscillatory inflow was carried out to study the differences in stress and flow field morphology of structures under different oscillation periods. Firstly, based on the self-developed underwater flow field simulation software zFlower, a module for inlet boundary conditions under unsteady inflow was developed. On the basis of a uniform and fully developed flow field, oscillation flow simulations with high and low frequency ratios were carried out to obtain the force state of the cylinder and the evolution process of the flow field under oscillation flow conditions. Results show that when the frequency of the incoming flow is high, the oscillating incoming flow will affect the vortex shedding morphology of the flow, while the peak transverse force on the cylinder is relatively large. Meanwhile, when the incoming frequency is low, the absolute value of the lateral force acting on the structure does not change significantly, but the frequency spectrum of the force is complex, which may make it easier to excite the flow induced vibration of the structure.

Key words： oscillating flow; flow structure; unsteady flow; low Reynolds number; flow around a cylinder

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