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首页> 外文期刊>International Journal of Naval Architecture and Ocean Engineering >Experimental investigation of flow characteristics around four square-cylinder arrays at subcritical Reynolds numbers
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Experimental investigation of flow characteristics around four square-cylinder arrays at subcritical Reynolds numbers

机译：亚临界雷诺数下四个方形圆柱阵列周围流动特性的实验研究

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ABSTRACT The Deep Draft Semi-Submersible (DDS) concepts are known for their favourable vertical motion performance. However, the DDS may experience critical Vortex-Induced Motion (VIM) stemming from the fluctuating forces on the columns. In order to investigate the current-induced excitation forces of VIM, an experimental study of flow characteristics around four square-section cylinders in a square configuration is presented. A number of column spacing ratios and array attack angles were considered to investigate the parametric influences. The results comprise flow patterns, drag and lift forces, as well as Strouhal numbers. It is shown that both the drag and lift forces acting on the cylinders are slightly different between the various L/D values, and the fluctuating forces peak at L/D = 4.14. The lift force of downstream cylinders reaches its maximum at around α = 15°. Furthermore, the flow around circular- section-cylinder arrays is also discussed in comparison with that of square cylinders.
机译：摘要深潜半潜式（DDS）概念以其良好的垂直运动性能而闻名。但是，由于色谱柱上的波动力，DDS可能会遇到关键的涡流诱导运动（VIM）。为了研究电流感应的VIM激振力，提出了以方形配置围绕四个方形圆柱体流动特性的实验研究。考虑了许多列间距比和阵列迎角，以研究参数影响。结果包括流型，阻力和升力以及Strouhal数。结果表明，作用在气缸上的阻力和升力在各种L / D值之间都略有不同，并且波动力在L / D = 4.14时达到峰值。下游气缸的升力在大约α= 15°时达到最大值。此外，还与方形圆柱体相比，讨论了圆形截面圆柱体阵列周围的流动。

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