Numerical simulation of skipping motion of three-dimensional structure based on boundary element method

In recent years, the water striking aircraft which realizes high-speed maneuvering flight near the water surface by using skipping motion has become one of the hot issues in research, and the solution of high-speed oblique water impact load of three-dimensional structure is the key step of skipping motion numerical simulation. Based on the boundary element method, a time-domain numerical simulation method of water surface skipping of three-dimensional structure considering structural elastic effect is established. The high-speed oblique water impact load is obtained by the boundary element method, and the displacement dynamic response of the structural node is obtained by the direct integration method of the state equation. Moreover, the centroid position and motion speed of the structure are updated by the skipping motion dynamic model. To verify the accuracy of the fluid load solution algorithm of this method, the numerical simulation of high-speed oblique water impact of steel sphere is carried out and compared with the experimental value. The time-domain numerical simulation and variable parameter analysis of skipping motion of three-dimensional rigid spherical crown are carried out. Then, the effects of structural mass, initial height, horizontal throw speed and radius on the skipping motion of the spherical crown are obtained. After considering the elastic effect, the impact load of high-speed oblique water entry decreases, which also has a certain influence on the sliding and jumping motion of the spherical crown. © 2022 Beijing University of Aeronautics and Astronautics (BUAA). All rights reserved.