圆形圆筒下游分离式柔性分流板的波浪诱导响应

Hongjun Zhu, Quanyu Chen, Jiawen Zhong, Wenxiang Zhang, Tongming Zhou
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引用次数: 0

摘要

在低雷诺数 Re = 160 条件下,对流经带有分离式柔性板的圆筒的流体进行了流固耦合数值研究。研究了三个板长的 0-6.0 宽间隙比范围。数值结果表明,涡流的形成与柔性板相对于圆柱体后方再循环区域的位置密切相关。研究确定了三种唤醒干扰机制,包括扩展体、连续再附着(CR)和交替再附着(AR)。考虑到唤醒干扰和涡流脱落模式以及响应顺序,观察到六种唤醒流动模式。在临界间隙 G/D = 3 时,CR 模式转变为 AR 模式,此时振动幅度和频率都急剧增加。涡流间距和板长的大小决定了柔性板的响应模式。与孤立的圆柱体相比,阻力系数和升力系数的最佳降低率分别约为 90% 和 20%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Wake-induced response of a flexible splitter plate detachedly placed downstream of a circular cylinder
A fluid–structure interaction numerical investigation was conducted on the flow past a circular cylinder with a detached flexible plate at a low Reynolds number Re = 160. A broad gap ratio range of 0–6.0 is examined at three plate lengths. Numerical results indicated that the vortex formation is closely related to the position of the plate with respect to the recirculation region behind the cylinder. Three wake interference regimes are identified, including the extended-body, continuous reattachment (CR), and alternate reattachment (AR). Taking into account the wake interference and vortex shedding modes and the response order, six wake flow patterns are observed. The CR regime shifts to AR at a critical gap G/D = 3, where both the vibration amplitude and frequency sharply increase. The sizes of vortex spacing and plate length determine the response mode of the flexible plate. Compared to an isolated cylinder, the optimal reduction percentages in drag and lift coefficients are around 90% and 20%, respectively.
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