潜伏式高速船型变航态自航数值模拟

针对一种具有半潜-水面航态变换功能的新型潜伏式高速船型，基于非稳态RANS方程组与VOF模型求解粘性流场，结合动态流域边界与滑移网格技术，对目标船在垂直面内三自由度运动及其喷水推进器叶轮随船定轴高速旋转的耦合运动进行数值模拟。结果表明：在相同主机平均转速条件下，所预报自航点体积傅氏数与自航模型试验结果的相对误差在7%以内；从半潜到水面的航态变换过程中，船体有显著的纵倾与升沉，船体主要克服压差阻力，船体兴波由相互叠加的首波、肩波、尾波逐渐发展为首尾分明的两个波系，在喷水推进器射流区内捕捉到生成和发展的高强度涡系。

Numerical Simulation on Self-propelled Navigation Mode Transition of a Latent High Speed Craft

The latent high speed craft (LHSC) is a newly designed hull which is able to switch between semi-submersible and surface navigation modes. Numerical simulation on the coupled motions of 3-dof motion in vertical plane and high speed axis-fixed rotation of water jet impeller in LHSC is carried out by solving unsteady RANS equations and VOF models, incorporated with dynamic fluid body interface and overset mesh techniques. It turns out that the relative error of volume Froude number between calculation and experiment results is within 7%; During the mode transition process, significant trim and heave is observed and the pressure drag is the primary cause of resistance, the initial superposed head, shoulder and trailing waves gradually transform into two distinguished head wave and trailing wave, high strength vortices developed from stator in water jet region is captured.