Hydrodynamic analysis of the recovery of USV in regular waves

FENG Dakui1，2，3，ZHAN Jin*1，2，3，YAN Jun4，SUN Yue1，2，3，WANG Xianzhou1，2，3 1 School of Naval Architecture and Ocean Engineering，Huazhong University of Science and Technology， Wuhan 430074，China 2 Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration，Shanghai 200240，China 3 Hubei Key Laboratory of Naval Architecture and Ocean Engineering Hydrodynamics，Wuhan 430074，China 4 China Ship Development and Design Center，Wuhan 430064，China recovery of the dinghy is a typical dynamic problem of multi-body interac⁃ tion，and the stern-slipway launch and retrieval system is widely used in that process. When the dinghy moves rapidly towards the capture devices which are located in the aft of the mother ship，it may be affect⁃ ed by the wake of mother ship which may cause overturn.［Methods］Numerical wave tank，overlapping grid technique and 6-DOF are mainly used and the interference motion of Fridsma planing in approaching the mother ship is simulated. The motion characteristics of planing vessel in waves are calculated and ana⁃ lyzed while the grid independence is verified. Then the simulation of small craft's motion in regular waves in the wake of mother ship is carried out.［Results］Comparison of computational and experimental results indicates that the calculation method is reliable. And the simulation results show that the influence from the mother ship is obvious.［Conclusions］When the direction of motion of planing deviated from the cen⁃ ter line of the wake of mother ship，the pitch and roll angle of it will be significantly affected，eventually leading to the occurrence of capsizing. launch and retrieval system；Unmanned Surface Vehicle（USV）；CFD；over⁃ lapping grid technique；numerical wave tank；ship motion

Abstract：［Objectives］The words：stern-slipway Key