Coupled Inline-Cross Flow VIV Hydrodynamic Coefficients Database
Coupled Inline-Cross Flow VIV Hydrodynamic Coefficients Database
复制标题
耦合串联错流 VIV 水动力系数数据库
DOI：
10.1115/omae2014-24659
复制
发表时间：
2014
影响因子：
3.7
通讯作者：
M. Triantafyllou
中科院分区：
文献类型：
--
作者：
Haining Zheng;J. Dahl;Y. Modarres;M. Triantafyllou
涡激振动（VIV）会对细长的物体造成严重的疲劳损伤，在过去的几十年里得到了广泛的研究。虽然过去的大多数研究都集中在横流方向上，但最近的研究表明，流向的直列运动由于其频率较高（二次谐波）而对疲劳寿命损伤产生重大影响，更重要的是，它与横流运动耦合，从而触发横流方向上的三次谐波应力分量。在本文中，通过流体力的半经验建模来解决耦合的直列横流 VIV 问题。在麻省理工学院的拖曳水池中设计并进行了广泛的细网格强制内联横流 VIV 实验。利用实验结果新构建了内联横流 VIV 流体动力学系数数据库，预计该数据库可用于其他现场预测耦合内联横流 VIV 的半经验程序。对数据库中的几个关键水动力系数，包括升力系数、阻力系数和附加质量系数进行了系统分析。发现横流和内联方向的系数对内联和横流运动之间的相位有很强的依赖性。© 2014 ASME
Vortex Induced Vibrations (VIV) cause major fatigue damage to long slender bodies and have been extensively studied in the past decades. While most of the past research focused on the cross flow direction, it was recently shown that the inline motion in the direction of the flow has a major impact on the fatigue life damage due to its higher frequency (second harmonic) and more importantly, its coupling with the crossflow motion, which triggers a third harmonic stress component in the cross flow direction. In this paper, the coupled inline-crossflow VIV problem is addressed from semi-empirical modeling of fluid forces. Extensive fine grid forced inline-crossflow VIV experiments were designed and carried out in the MIT towing tank. An inline-crossflow VIV hydrodynamics coefficients database was newly constructed using the experimental results and it is expected to be useful for other semi empirical programs predicting coupled inline-crossflow VIV in the field. Several key hydrodynamic coefficients in the database, including lift force coefficients, drag force coefficients and added mass coefficients, were systematically analyzed. The coefficients in the crossflow and the inline directions were found to have strong dependency on the phase between the inline and crossflow motions.© 2014 ASME