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It is a technical difficulty to calculate the hydrodynamic parameters when autonomous underwater vehicle (AUV) carries some complex shape appendages (equipment). The general hydrodynamics simulation software CFX and the SST turbulence model were used to calculate the hydrodynamics of AUV with CTD and GPS/Beidou antennas, obtain the AUV hydrodynamic variation of three models and analyze the influence of different appendages on the hydrodynamics of AUV. The results show that the horizontal of AUV with appendages is asymmetric, the pressure and speed change rapidly at the appendages, resulting in the great change of AUV hydrodynamic parameters and the flow field. The numerical results pro- vide a reference frame for the engineering design of AUV. [ABSTRACT FROM AUTHOR]

In order to obtain the hydrodynamic characteristics of the unmanned underwater vehicle (UUV) parking on the seabed and the effect of vertical thrusters on it, two kinds of UUV, with and without vertical thrusters respectively, were modeled and meshed using the software ANSYS ICEM in different distances from the seabed and different seabed oblique angles, and the flow fields around these UUVs were simulated by using CFX. From the simulation, the lateral forces and lifts of these two UUVs under different conditions were obtained and the curves of lateral forces and lifts changing with distance from the seabed, oblique angle and water velocity were analyzed. Finally, the effect of vertical thrusters on the hydrodynamic characteristics was analyzed according to the simulation results. The results reveal that the effect of the distance from the seabed on the lateral forces is minor while that on lifts is great; both of the lateral forces and lifts increase rapidly with the increase of water velocity; the lateral forces decease slowly with the increase of the absolute value of seabed oblique angle while lifts increase rapidly; the lateral forces of UUV with vertical thrusters are 5% ~ 15% larger than that if UUV without vertical thrusters while lifts are several times larger. [ABSTRACT FROM AUTHOR]