矩形截面半潜式平台浪流耦合作用涡激运动响应二维数值模拟

通过计算流体力学(CFD)数值模拟,针对一型采用矩形截面立柱设计的深吃水半潜式生产平台,研究其在波浪和流共同作用时的涡激运动响应.选取典型135°来流方向,以正弦振荡流模拟波浪,考虑不同KC数、不同相对流数下波浪与同向均匀流耦合作用.研究表明,较之于仅有均匀流作用,均匀流和正弦振荡流耦合作用时,矩形截面立柱的半潜式平台运动响应明显增大.振荡流耦合作用影响显著.

A Two-Dimensional Numerical Study of Vortex Induced Motion of a Semi-Submersible with Rectangular Sections in Coupling Currents and Waves

Abstract： A deep draft semi submersible (DDS) in certain flow conditions is subjected to vortex induced motions (VIM), which significantly influences the loads and fatigue of moorings and risers. To investigate the VIM of a DDS with four rectangular columns in uniform current coupled with waves, a numerical study using CFD method was conducted. The current in a typical current of 135°was chosen by coupling with sinusoidal oscillatory flows used to simulate the waves with different KC numbers and relative current numbers were chosen. The results show that the VIM response of this kind of DDS with four rectangular columns in current with oscillatory flows is more significant than that in the current. The oscillatory flows have an important influence on the VIM response of the DDS.