双桨双舵舰船旋臂试验粘性流场数值模拟方法研究

Numerical simulation of the viscous flow over the ship with twin-propellers and twin-rudders in rotating arm tests

文章基于RANS方程,对计及自由面影响的双桨转动情况下的舰船旋臂试验(RAT)粘性流场数值模拟方法进行了研究。在旋臂试验的数值模拟中,根据旋臂试验的特点,采用分区混合网格,结合MRF方法和滑移网格方法,解决船体圆运动及螺旋桨定轴旋转运动的叠合难题。文中以ITTC推荐的MARIN model no.7967船模为对象,对其在四组转动半径下的旋臂试验进行了数值计算,并将结果与权威水池试验结果进行了对比,吻合良好。文中提出的方法可获得全附体船模旋转流场水动力性能参数,可以较真实地模拟其流场特性,获取包括船—舵—桨干扰在内的流场信息。该文的工作是可行的、有效的,可为深入研究舰船自由旋回试验及非定常操纵运动的数值模拟提供基础。

A combination of methods was developed to account for the viscous flow over a hull with twin-propellers and twin-rudders in Rotating Arm Tests. Firstly, an Reynolds averaged Navier-Stokes method （RANS） is used to determine hydrodynamic forces on a hull in this unsteady motion. Secondly, volume of fluid method （VOF） is devised for the treatment of free surface. Finally, the Moving Mesh method was ap-plied to simulate the twin-propellers’ rotation movement, and the Multiple Reference Frame （MRF） method was used to simulate the hull’s circular motion. Cased studies involving the MARIN model NO.7967 which was recommended by ITTC were run on four different radiuses （from 13.42 m to 22.682 m）. These show that the suggested method is efficient and capable, with results that are in good agreement with experimental data.