Numerical research on free running model maneuvering motion of a generic submarine based on overset mesh

Aiming at the actual demand of improving the numerical simulation of unsteady submarine motion in maneuvering condition, the overset mesh was used to directly model six degree of freedom coupling motion of a submarine and the independent motion of each control surface, and the sliding mesh was used to directly simulate the propeller rotation at the stern of a submarine, so as to carry out the research on the numerical simulation of a generic submarine in self-propulsion and free running maneuvering conditions. Through the procedure of numerical simulation in typical working conditions, such as submerged self-propulsion, turning maneuver, zigzag maneuver, crashback, etc., the issues of submarine/propeller/rudder hydrodynamic cou⁃ pling modeling and PD (proportional-derivative) numerical control realization of autopilot in maneuvering condition were emphatically solved, and the technology of free running submarine model numerical simula⁃ tion based on overset mesh was established. At the same time, the surrounding flow phenomenon and the time-history change process of kinematics and dynamics parameters of the submarine in maneuvering condi⁃ tion were analyzed. By comparing the numerical simulation results of typical dynamics parameters with the model test results, the practicability of the approach for engineering prediction was verified. The research can provide a guidance for the prediction and evaluation of submarine maneuverability and seaworthiness. It is beneficial for the improvement of free running submarine model tests. © 2024 China Ship Scientific Research Center. All rights reserved.