摘要
[目的]针对限制边界内的串列双方柱绕流,研究雷诺数为100时,变截面双方柱(边长比为1.5)绕流在不同间距比下对流场、阻力的影响规律。[方法]基于格子Boltzmann方法以及反弹格式对限制边界内的串列双方柱绕流流场进行数值模拟,对比不同间距比下变截面和等截面双方柱的流场模式和阻力系数。[结果]结果表明,在相同的间距比下,变截面在一定程度上可以加速流场模式的改变,但在间距比为6时反而将延缓流场模式的改变;相较于单方柱绕流,变截面的减阻效果最高可达9.16%,而等截面最高可达7.76%;相较于等截面,在相同间距比下的变截面最高可以减阻67.79%,即变截面的减阻效果更好,所以变截面是实现流场控制、减阻的可选方案。[结论]研究结果可为限制边界内方柱绕流的阻力优化、流场控制提供参考。
[Objectives]This study focuses on the influence and drag force of tandem square cylinders of variable size(with a side length ratio of 1.5)in order to determine the flow past tandem square cylinders in a constrained boundary under different gap ratios at a Reynolds number of 100.[Methods]Based on the lattice Boltzmann method with the bounce-back boundary condition,comparisons of the effects of tandem cylinders of equal and variable size are made under different gap ratios.[Results]The results indicate that cylinders of variable size can accelerate the change of the flow field pattern to a certain extent.However,they can also delay the change of the flow pattern at a gap ratio of 6.In addition,they can achieve a resistance reduction of 9.16%at most compared with the flow past a single square cylinder.However,tandem cylinders of equal size can achieve 7.76%at most.On the other hand,compared with tandem cylinders of equal size,those of vari-able size can achieve a resistance reduction of 67.79%.Thus,tandem cylinders of variable size can obtain a better reduction in drag force,making them a feasible way to achieve flow control and drag reduction.[Conclusions]The results of this study can provide basic guidance for the optimization of drag and flow control for flow past square cylinders in a constrained boundary.
作者
余洋
杨光照
侯国祥
YU Yang;YANG Guangzhao;HOU Guoxiang(College of Shipping and Ocean Engineering,Wuhan Institute of Shipbuilding Technology,Wuhan 430050,China;School of Naval Architecture and Ocean Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;Green&Smart River-Sea-Going Ship Cruise and Yacht Research Center,Wuhan University of Technology,Wuhan 430063,China)
出处
《中国舰船研究》
北大核心
2025年第3期63-71,共9页
Chinese Journal of Ship Research
基金
工业和信息化部高技术船舶科研计划资助项目(2020307)
国家自然科学基金资助项目(51979115)。
