Study of Water Entry Characteristics of Vehicle Under Different Wave Surface Conditions

The vehicle will be subjected to strong impact load during process of water entry. Wave conditions may decline the water-entry load and improve ballistic characteristics of the vehicle, which have a great significance on ensuring smooth water entry and load reduction of the vehicle. In this paper, Coupling Euler–Lagrange (CEL) method is used to establish a fluid–structure coupling numerical model of a vehicle water-entry. The obtained numerical results are compared with the experimental data in order to validate this numerical method. Subsequently, the characteristics of the water-entry load under a predefined wave condition are studied. Then a contrastive analysis on the impact load and the ballistic characteristics are made under a wave-free and a predefined wave condition. Finally, effect of entry position on the water-entry slamming and ballistic performance is discussed. The results show that when the vehicle with high velocity enters water with an appropriate wave condition, its trajectory and impact load can be improved effectively. The feasibility of using wave surface conditions to solve the water-entry problem at low angle with a high velocity is verified.