Study On Flow Field Characteristics Of Small-scale Revolution Body During Water Entry

The process of water entry denotes the vehicle entering into water from air, which lasts for a brief time but is of significant importance in both theory and substantial value in engineering. In the present paper, the numerical simulation and experimental investigation are applied to discuss the flow field characteristics of a small revolution body during water entry.Numerical simulations based on RANS equations utilizing dynamic mesh method are applied for the numerical solution of the water-entry process to study the variation in body velocity and the formation and development of water-entry cavity. The validation of numerical model is examined through compar ison with experimental results.3D numerical simulations of water entry of small-scale revolution body in oblique at low speed are performed to study the formation and development of water-entry cavity as well as motion and dynamic characteristics of the body varying with time. The effects of motion parameters(such as the initial velocity and angle during water entry) and model parameters(such as the head form and the density of the body) which act on the formation and development of water-entry cavity, the velocity, as well as the drag coefficient are investigated.The experiment of water entry of small-scale revolution body at low speed in oblique was performed. Firstly the typical experiment is executed to study the formation and development of the cavity, and as well the splashing varying with time during the body entering the water obliquely. Comparative tests are applied to analyze the effects of the motion parameters and model parameters on the closure time of water-entry cavity, the velocity and the drag coefficient of the revolution body.