After successful release from the cabin, the underwater structure continues ascending to the water surface under residual buoyancy. However, its ascent velocity and attitude may affect personnel safety, making it essential to study the ascent dynamics and safe surfacing behavior. This paper conducts experimental research on the underwater release and ascent of submerged structures. Numerical simulations of the ascent motion are performed using computational fluid dynamics (CFD) software STAR-CCM+, and the results are compared with experimental data. The close agreement between simulations and experiments validates the feasibility of this numerical approach. Building on this validated method, the study further investigates the ascent process under varying angles of attack. The results demonstrate that this numerical approach can serve as a reliable reference for analyzing the ascent motion of underwater structures.
Liu et al. (Sun,) studied this question.