TLP涡激运动数值模拟与水池试验研究

Numerical simulation and model test of vortex-induced motions of TLPs

以传统式张力腿平台(Tension Leg Platform)为对象,采用数值模拟与水池实验相结合的方法研究TLP涡激运动问题,以及张力腿和立管涡激振动特性;采用计算流体力学的方法,建立TLP涡激运动数值分析模型,分析均匀流作用下不同流速、来流方向、以及规则波波流联合下TLP涡激运动规律,对张力腿、立管的涡激振动特性进行分析;将数值模拟计算结果与拖曳水池、全水深系泊水池试验结果对比,验证数值模拟与水池试验的一致性。分析结果表明,当流的折合速度在5.5~8.5之间时,TLP涡激运动出现锁频现象,系泊有减小平台横向涡激运动的作用,规则波对于流致涡激运动横荡方向运动有减小作用,而对纵荡的影响是其响应随规则波波高的增加而增加。本文得到的结论可为TLP的运动性能研究和工程设计提供参考。

With a traditional tension leg platform(TLP)taken as the research object,the vortex-induced motion problem of TLPs as well as the vortex-induced vibration characteristics of tension legs and risers were studied by numerical simulation combined with tank model tests.Using the method of computational fluid dynamics,the numerical analysis model of TLP vortex-induced motions was established,and the law of TLP vortex-induced motions under the action of uniform flow with different flow velocities,incoming flow directions,and regular wave currents was explored,and vortex-induced vibration characteristics of the tension leg and riser were also analyzed.In addition,the numerical simulation calculation results were compared with the results of towing tank model test and full-depth mooring model test to verify the consistency between the results of the numerical simulation and the test.The analysis results show that when the reduced velocity of the flow is between 5.5 and 8.5,the frequency locking phenomenon of TLP vortex-induced motion appears,mooring can reduce the lateral vortex-induced motions,and regular waves can reduce the movement in the sway direction of the flow-induced vortex-induced motions,but the influence of the regular waves on the surge is that their response increases with the increase of the regular wave height.The research results of the paper can serve as a reference for the research and design of TLPs.