| Citation: | WU Lihong, WANG Shiwen, FENG Xisheng, et al. Physics-based numerical simulation of AUV docking by self-propulsion[J]. Journal of Beijing University of Aeronautics and Astronautics, 2020, 46(4): 683-690. doi: 10.13700/j.bh.1001-5965.2019.0305(in Chinese)
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To predict the effect of dock on hydrodynamic performance of autonomous underwater vehicle (AUV) and to improve AUV underwater docking success rate, a method of multi-block hybrid grids combined with dynamic layer method and user defined function (UDF) was presented, which was applied to the physics-based numerical simulation of AUV underwater docking by self-propulsion with a discretized propeller. In this method, subdomain-moving substitutes for boundary-moving used in traditional dynamic mesh, which could improve the calculation efficiency. After the numerical validation of the velocity history of AUV self-propulsion against the experimental results, the hydrodynamic performance and flow field of AUV underwater docking were investigated. The results demonstrate that the time of AUV underwater docking from rest by a constant rotating propeller of 300 r/min is about 16 s. The end velocity reaches 0.75 m/s, which meets the demand for collision. The effect of the dock on AUV locates on the neck point B. There is a drag on AUV before B, followed by a suction after B. The increment of resistance is small with a value of 2.4%. Therefore, it is achievable for AUV docking with the dock.
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