两自由度不同截面形式柱体涡激振动的CFD数值模拟

摘要

文章采用计算流体力学（CFD）方法，结合SST k-棕湍流模型，对低质量比柱体进行两自由度涡激振动数值模拟，得到了柱体升力、曳力系数的时程曲线，并观察了柱体进入锁振状态的幅值变化，研究了不同截面形式柱体在外流速处于0.1-1.0 m/s范围内的振动响应。将圆柱体在不同流速下两向振动的CFD数值模拟与实验数据进行比较，得到了较为满意的结果。通过分析不同截面柱体在不同外流速下的振动幅值发现，带有抑振装置的柱体截面形式能够有效地减小涡激振动，其中，板状截面柱体抑振效果较好。%This paper focuses on the interaction between fluid and riser, i.e., the flow field through forced oscillating cylinder with various cross-sections. Fluid-structure interaction (FSI) problems are solved by employing a combination of Computational Fluid Dynamics (CFD) numerical simulation and computational structural dynamics. Compared with a bare riser, the vibration pattern of risers equipped with various sup-pression devices is investigated to obtain their VIV characteristics. The results of numerical simulation by the present method is observed more close to the data of experiment. And it also shows that at the different flow velocity with the range between 0.1-1.0 m/s, the vibration amplitude of risers equipped with suppres-sion devices is conspicuously smaller than that of the bare rise. Besides, the results show that the cylinder with plate suppression is the best performance.