不同头型回转体低速倾斜入水过程流场特性数值模拟

基于有限体积法和VOF多相流模型求解气、水两相流动的RANS方程，结合动网格技术，对回转体低速倾斜入水过程进行数值模拟研究.通过将数值计算结果与试验数据进行比较，验证了数值计算方法的有效性.基于该方法对不同头型回转体低速倾斜入水过程进行分析，得到不同头型条件下回转体入水空泡形态发展规律、回转体运动特性及流体动力特性变化规律.研究结果表明:同一入水深度，入水空泡直径和流场中最小压力值随着回转体头部锥角的增加而增大；不同头型回转体，锥头母线同一位置处压力随着头部锥角的增加而增大；回转体阻力系数与其头部锥角大小直接相关，锥角较大时，阻力系数也较大，速度衰减也较快. 

Numerical Simulation of the Flow Field Characteristics of Low Speed Oblique Water Entry of Revolution Body

The numerical simulation of oblique water-entry of a revolution body at low speed was performed. Finite volume method was introduced to solve the Navier-Stokes equations, and VOF (volume of fluid) and dynamic mesh method were used for the multiphase flow and the movement of the water-entry revolution body. The effectiveness of the numerical method was verified by comparison between numerical and experimental results. Based on this method, the flow field characteristics during the oblique water entry of the revolution body with different head forms at low speed were analyzed. Results show that in the same water depth, the diameters of the water-entry cavity and the minimum pressure in the flow field are larger as the cone angle of the head increases. For the revolution body with different head forms, the pressure at the same position of the the generatrix increases with larger cone angle of the head. When the angle of the cone head is larger,the pressure coefficient of the revolution body gets larger, and the velocity attenuation gets faster.