Numerical Simulation Research On Water Entry Problem Of Wedge

The process of water entry denotes the vehicle entering into water from air. The fluid medium around body will gradually move away from it when body is slamming into the water. This process lasts for a brief time but is of significant importance in both theory and substantial value in engineering. In this paper, the numerical simulation is applied to discuss the flow field characteristics of a wedge during water entry.First, numerical simulations based on RANS equations utilizing finite volume method and dynamic mesh method are applied for the numerical simulation research of wedge slamming of into the water with commercial FLUENT v14.5 as a platform. The validation of numerical algorithm is proved through the comparison of the results of numerical simulation numerical and previous experimental results.The two-dimensional and three-dimensional numerical simulations are studied for the water entry of wedge. The two-dimensional numerical simulation aims mainly at the slamming pressure extremum, slamming pressure coefficient and wedge body movement characteristics changing with the time when wedge vertically fell into the water. 3D numerical simulations of water entry of wedge in oblique at low speed are performed to study the slamming pressure of each measurement point changing with the time. The effects of motion parameters(such as the initial velocity and angle during water entry) which act on the formation and development of the velocity and angle of water-entry. Finally it analyzes differences between vertical and oblique water entry under the same angle during water entry.There are relationships between pressure, velocity and acceleration with the quality of the wedge when the three-dimensional numerical simulation to study of slamming into the water. In this process, it founds that the position of maximum slamming pressure and confirms that the maximum of slamming pressure is directly proportional to the square of speed.