Flow Control of an Elastically Mounted Square Cylinder by using an Attached Flexible Plate
Flow Control of an Elastically Mounted Square Cylinder by using an Attached Flexible Plate
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使用附加柔性板对弹性安装方筒进行流量控制
DOI：
10.1063/5.0139662
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发表时间：
2023-02
影响因子：
4.6
通讯作者：
L. Zhang
中科院分区：
文献类型：
--
作者：
J. Y. Shao;J. D. Wen;L. Zhang
本文通过在下游放置附加板来数值研究弹性安装方柱的流动控制。长固/柔板对圆柱流动的控制效果已被广泛讨论。不过，短板的效果并不明显。此外，很少有知识是已知的VIV（涡激振动）抑制效果的方柱通过使用固体/柔性板。本文系统地研究了雷诺数为150时弹性安装方柱的板长和柔性对涡激振动抑制的影响。首先，分析了无量纲长度在较大范围内变化的固体平板的效应。通过使用附加的实心板，即使板的长度较短，也可以实现显著的VIV抑制。灵活性的影响更为复杂。短的柔性板不如具有相同长度的实心板有效。另一方面，具有中等柔性的长柔性板可以进一步增强VIV抑制。通过使用具有最佳柔性的长柔性板，可以实现最大96%的振动振幅降低。此外，还归纳出了弹性安装方柱的两种涡激振动抑制机理，并分析了弹性安装方柱的短、长平板对涡激振动抑制的影响。
This work numerically investigates flow control of an elastically mounted square cylinder by using an attached plate placing downstream. Flow control effect by using a long solid/flexible plate for a circular cylinder has been widely discussed. However, the effect of a short plate is not clear. In addition, few knowledge is known for VIV (vortex induced vibration) suppression effect for a square cylinder by using a solid/flexible plate. The present work systematically studies the influence of plate length and flexibility on VIV suppression for an elastically mounted square cylinder at Reynolds number 150. Firstly, effect of a solid plate with non-dimensional length varying in a wide range is analyzed. Significant VIV suppression can be achieved by using an attached solid plate, even with a plate at short length. The influence of flexibility is more complex. A short flexible plate is less effective than a solid plate with the same length. On the other hand, a long flexible plate with medium flexibility can further enhance VIV suppression. A maximum 96% reduction in the vibration amplitude can be achieved by using a long flexible plate with optimal flexibility. Additionally, two VIV suppression mechanisms for an elastically mounted square cylinder with an attached plate are concluded, and the influence of flexibility for both short and long plate is also analyzed.