双体船不同状态流场特性与力学性能仿真

Numerical simulation of flow field characteristics and mechanical properties of catamaran in different states

以双体船为研究对象,采用数值仿真法分析船舶运动阻力及其周围流场变化情况。首先将双体船设定为固定姿态,并采用紊流模式进行船舶相对运动流场数值仿真计算,然后运用滑移网格技术对船舶进行俯仰、起伏运动模式下的绝对运动流场分析,以探讨船体姿态变化对船舶流场及阻力的影响。结果表明:运用CFD数值仿真结果与实验值相吻合,船体六自由度计算模式可接近船舶真实的运动状况,加入波浪运动后船体阻力变化的数值计算结果接近实船的阻力测量值,验证了该方法的有效性。

The numerical simulation method is used to analyze the catamaran’s motion resistance and the variation of its surrounding flow field. Firstly, the catamaran is set as a fixed attitude, and the turbulent model is used to simulate the relative motion flow field of the ship. Then, the absolute motion flow field of the ship in pitching and undulating motion mode is analyzed by using the slip grid technology, in order to explore the influence of the change of hull attitude on the flow field and resistance of the ship. The results show that CFD numerical method are in good agreement with the experimental data,and it has good reliability. This method can be used as an effective analysis tool for ship designers to analyze flow field and predict ship resistance.