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首页> 外文期刊>Ocean Engineering >Numerical investigation of flow around one finite circular cylinder with two free ends
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Numerical investigation of flow around one finite circular cylinder with two free ends

机译：带有两个自由端的有限圆柱体周围流动的数值研究

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摘要

Flow around one finite circular cylinder with two free ends is of both fundamental and practical importance, without a detailed discussion yet. In this study a numerical investigation is performed to demonstrate its flow pattern and turbulent structure varying with the aspect ratio and Reynolds number. The results show that the drag coefficient decreases dramatically in comparison with the two-dimensional model and the horseshoe vortex around the mounted cylinder with one free end disappears. Instead, a pair of stationary recirculating eddies behind the cylinder is found in the axis direction at low Reynolds number. With the increasing of Reynolds number, four spiral vortices are formed by the interaction of the two three-dimensional separated flows from two free ends and the wake formed by the cylindrical surface. The separated flow recirculates to the backside of the cylinder and increases its local pressure. Additionally, an intersection zone and a backflow is found close to the end surface, caused by the up -wash flow from the sharp leading edge of the cylinder. Finally, a new relationship between the drag coefficient and the Reynolds number for one finite circular cylinder with two free ends is proposed.
机译：围绕着一个带有两个自由端的有限圆柱体的流动具有根本和实际的重要性，目前还没有详细讨论。在这项研究中进行了数值研究，以证明其流动模式和湍流结构随纵横比和雷诺数而变化。结果表明，与二维模型相比，阻力系数急剧下降，带有一个自由端的圆柱体周围的马蹄涡消失了。取而代之的是，在圆柱体后方沿轴向方向以低雷诺数找到了一对静止的循环涡流。随着雷诺数的增加，由两个自由端的两个三维分离流与圆柱表面形成的尾流的相互作用形成了四个螺旋涡旋。分离的气流再循环到气缸的背面，并增加其局部压力。另外，在靠近端面处发现了相交区域和回流，这是由于来自圆柱体尖锐前缘的向上冲洗流所致。最后，提出了一个具有两个自由端的有限圆柱体的阻力系数与雷诺数之间的新关系。

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