Hydrodynamic characteristics and stability analysis of UUV (unmanned underwater vehicle) parking on the seabed

UUV is playing a more and more important role in the world. A UUV that can park on the seabed has been designed in Northwestern Polytechnical University. This UUV can monitor the sea environment for a long time without adjusting its attitude. In order to ensure that this UUV can work normally, the stability of it when working on the seabed needs to be analyzed. In the full paper, we explain the stability analysis model of the UUV and the hydrodynamic forces on it in detail. In this abstract, we just add some pertinent remarks to listing the two topics of explanation. The first topic is the stability analysis model. In the first topic, the forces on the UUV were shown in Fig. 1 and the stability analysis model was defined. The second topic is the hydrodynamic forces on the UUV when parking on the seabed and it is covered in sections 2, 3 and 4. In the second topic, structured grids of the UUV are meshed using ICEM commercial software and the flow field around it is simulated using CFX commercial software. Section 2 describes the numerical method and boundary conditions of simulation. Simulation conditions are shown by Table 2 and the method of how to get a high quality structured grid is introduced in section 3. In section 4, simulation results of the forces on the UUV with different distances from the seabed, different velocities and different oblique angles are summarized in Figs. 5 through 10. Finally, the stability of the UUV parking on the seabed is analyzed and a group of parameters that can ensure the UUV working stably on the seabed is given in the very last paragraph of subsection 4.4.