圆立柱张力腿平台涡激运动特性数值研究

Numerical investigation on characteristics of vortex-induced motion of tension leg platform with circular columns

该文基于改进的延迟分离涡模型(improved delayed detached eddy simulation,IDDES),对张力腿平台在不同约化速度U(UT/D,其中U为流速,T为固有周期,D为立柱直径)下的涡激运动响应特性进行了研究,计算并分析了横向运动和艏摇运动的运动轨迹、响应幅值和运动能量频谱,并重点分析了吃水和流向角对运动响应幅值及频谱分布的影响。计算结果表明,吃水的增加会显著增大锁定区间内的横向运动和艏摇运动响应幅值。相比于15°、22.5°、30°和45°流向角工况下的结果,0°流向角下张力腿平台的横向运动和艏摇运动响应幅值更大,锁定区间对应的约化速度范围相对滞后。

Based on Improved Delayed Detached Eddy Simulation(IDDES),Transverse(sway)and yaw motion responses of TLP in different reduced velocities U(UT/D,U means incidence velocity,means Tnatural period,D means column diameter)are computed.The transverse and yaw motion responses,motion trajectories,dominant frequency and power spectral density of the motions are analyzed systematically.Effects of draft condition and current incidence on transverse and yaw motion responses amplitudes and peak frequencies are analyzed.It is confirmed that the increase in draft can significantly increase the response amplitude of transverse and yaw motions in lock-in region.The responses of transverse and yaw motions at 0°current incidence are greater than those at 15°,22.5°,30°and 45°current incidences,while the reduced velocity range corresponding to lock-in region lags relatively.