粘性对方尾船波浪力的影响分析

航行船舶绕射问题的准确求解是预报船舶波浪中运动的基础.文章分别采用基于三维移动脉动源的边界元法和基于RANS方程的CFD方法求解了规则波中航行的方尾船模型的波浪力,并通过与试验结果比较验证了方法的可靠性.CFD计算时通过从波浪力中分离出粘性力,研究了粘性对方尾船波浪力的影响.结果表明,基于RANS方程的波浪力计算结果与试验结果和势流理论结果吻合良好,在长波中与试验值更接近.粘性对船模斜浪航行时的横摇力矩有较大影响.

Evaluation of Viscous Effect on Wave Excitation Force of a Vessel with Transom Stern

The accurate prediction of wave excitation force is essential for the prediction of ship mo-tions in waves. The wave excitation force of a ship with transom stern in wave is studied here by two different calculation methods: complicated CFD simulation based on an unsteady RANS approach and boundary element method based on three dimensional translating and pulsating Green Function (3DTP). Comparisons are made between the experimental data and numerical results to validate each numerical method. The viscous effect on wave excitation force is investigated by taking advantage of CFD. The results indicate that both RANS method and 3DTP method give good prediction of wave ex-citation force, while the RANS method gives slightly better result in the long wave range. The vis-cous effect accounts for a large component of the roll moment in oblique wave.