养殖工船液舱双自由度耦合晃荡数值模拟

Numerical Simulation of Two Degrees Coupled Sloshing of Distributed Liquid Tanks in Ships

养殖工船作为海水养殖业向深远海发展的一个方向,具有较高的经济价值,其发展前景广阔,得到了广泛的研究。养殖工船内部液舱众多,船体在波浪中的摇荡运动导致液舱晃荡的发生,会对液舱内养殖鱼体生存环境和液舱结构造成很大影响。本文依据已有养殖工船模型的运动数据和液舱结构模型,采用计算流体力学软件STAR-CCM+对单自由度下、固有频率下和双自由度下的养殖工船液舱晃荡分别进行了数值模拟,得到了不同频率及测点位置处的晃荡压力,研究了不同情况下舱室内液体波面的变化以及流速分布情况,比较了模拟与试验得到的测点压力值,验证了数值模拟方法的准确性。研究成果可为养殖工船的进一步研究发展提供参考。

The distributed liquid tanks are widely used in LNG carriers,aquaculture ships and some other ships.Due to the ship motions in waves,especially the pitching and rolling coupled motions in oblique waves,the liquid sloshing in tanks will take place,which will have a great impact on the living environment and the tank structures in aquaculture ships.Based on the motion data from the aquacul-ture ship model test,the CFD software STAR-CCM+was used to carry out the numerical simulation of the tank sloshing of an aquaculture ship under single degree of freedom and double degrees of free-dom.The magnitude of the sloshing pressure at different frequencies and measuring points were ob-tained,and the changes of the wave surface and the flow velocity distribution in the tank under differ-ent conditions were studied.The measured point pressure values obtained by simulation were com-pared with the experimental data to verify the accuracy of the numerical simulation method.The re-sults can serve as a reference for the structure strength analysis and optimization of the liquid tanks of aquaculture ships.