In this work

the computational fluid dynamics(CFD) method is used to study the resistance character of an underwater vehicle in a specific undersea tunnel circumstance. In order to prove the validity of the proposed method

the standard Suboff model was numerically calculated and the simulation results were in agreement with the experimental data published by ITTC. This work presents different effects of resistance and pressure on two front supporting structures with the simulation results of the two different models. The flow field around the vehicle and the resistance characteristics changing under different working conditions were analyzed. The results show that the bar supporting structure can reduce the resistance and surface pressure fluctuation compared with the board model and the trend of resistance and pressure changes under different working conditions is different. In the downstream direction

the resistance decreases with the increase of navigation speed

where in the upstream direction it goes by contraries.