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首页> 外文期刊>Ocean Engineering >Spanwise wake development of a bottom-fixed cylinder subjected to vortex-induced vibrations
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Spanwise wake development of a bottom-fixed cylinder subjected to vortex-induced vibrations

机译：经过涡旋诱导的振动的底部固定圆柱的三维唤醒开发

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This study analyses the spanwise wake dynamics and structural response of a bottom-fixed cylinder subjected to a range of open-channel fully developed turbulent flows. The experiments were performed with a Reynolds number ranging between 4.5 x 10(2) and 1 x 10(3). The cylinder free end response and wake dynamics were measured using Particle Image Velocimetry and image-based tracking techniques. The cylinder had a significant modulated response, from which a Proper Orthogonal Decomposition revealed a clockwise elliptical-type trajectory at the maximum cylinder response. Wake dynamic analysis showed that the maximum response is achieved when the cylinder motion and vortex shedding frequencies are equal (i.e. synchronised) to the natural frequency of the structure measured in still water, and when this equivalence is preserved along the span of the cylinder. As the flow velocity increases, a spanwise bottom-up desynchronisation process develops moving towards the water surface. This process decreases the vortex-formation region strength along the span of the cylinder, reducing the maximum structural response and eventually changing the vortex shedding pattern. Despite the highly three-dimensional experimental conditions under significant turbulent incoming flows, the findings of previous studies based on simpler experimental models can still be used to broadly explain the observed desynchronisation process.
机译：该研究分析了经过一系列开放通道的底部固定圆柱的翼展唤醒动力学和结构响应。使用雷诺数在4.5×10（2）和1×10（3）之间进行实验。使用粒子图像速度和基于图像的跟踪技术测量气缸自由端响应和唤醒动力学。汽缸具有显着的调制响应，从该响应，适当的正交分解在最大汽缸响应处揭示了顺时针椭圆型轨迹。唤醒动态分析表明，当汽缸运动和涡流脱落频率等于（即，同步）到静止水中的结构的固有频率时，并且当沿着圆柱的跨度保存时，沿着圆柱体的跨度保持的自然频率，并且当沿着圆柱体的跨度保持时，实现了最大响应。随着流速增加，始线的自下而上的去同步过程发展朝向水面移动。该过程沿着圆柱体的跨度降低涡流形成区域强度，从而降低最大结构响应并最终改变涡流脱落模式。尽管在显着的湍流传入流下具有高度三维实验条件，但基于更简单的实验模型的先前研究的结果仍可用于广泛解释观察到的去同步过程。

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