Numerical simulation of emergency surfacing motion of submarine based on volumetric force model

  Objectives  In order to explore the laws of the emergency surfacing motion of submarines, a simplified model of propeller volume force was used to carry out the numerical simulation of submarine emergency surfacing motion at different speeds.

  Methods  Numerical simulations of the underwater fixed depth, ascent and surfacing of the hull were carried out, and submarine buoyancy under different speeds was compared and analyzed by matching the screw rotation speed with the speed of the submarine, as well as its ascent time and attitude.

  Results  As the results show, the faster the rotation speed, the shorter the time for the submarine to gain steady speed and maintain fixed depth underwater. Regardless of the trim angle or heeling angle, the time when the angle changes for the first time and that when the peak occurs show a trend of reduction although the rotational speed increases. At the same time, with the increase in rotation speed, the fluctuation time of trim angle increases, while the fluctuation time of heeling angle decreases.

  Conclusions  The relevant calculation methods and results of this study can provide practical references for research on submarine emergency surfacing motion.