Simulation analysis on trajectory stability of high-speed water entry at a small angle for disc-spinning body

  Objectives  This study focuses on the problem of the stability of high-speed water entry and puts forward a new disc-shaped configuration.

  Methods  High-speed water entry at a small angle is simulated for a disc-spinning body and cusp revolution body using a 3D model based on a combination of Language structure mesh and Euler fluid mesh, and the collation method is carried out using the experimental results. A comparison of the two simulations at a 7º water entry angle and a speed of 405 m/s is then carried out to analyze stability. The stability of the disc-spinning body at different water entry angles is also studied using the simulation method.

  Results  The results show that the cusp revolution body ricocheted from the surface of the water, while the disc-spinning body maintained a straight trajectory and remained stable during water entry at high speeds and a small angle. The disc-spinning body can also achieve a stable water entry trajectory at different angles with a very small deflective gap.

  Conclusion  The results of this study can provide a new method for launching effective payloads to underwater targets with higher precision, stability and speed.