Numerical Simulation Of Ship Maneuvering Motion Based On Ship-to-ship Effect

Waterway transportation plays a very important role in the contemporary national economy,especially inland waterways play a pivotal role in the development of the country.China has numerous river systems,and its inland waterway mileage ranks first in the world.To promote the development of inland waterway transport,China has focused on strengthening port infrastructure construction and standardization of transportation vessels,further promoting the rapid development of inland waterway transport.However,the continuous increase in the number of vessels,speed,and tonnage has also caused an increase in vessel density.Due to the relatively narrow width of inland waterways,the problem of ship-to-ship interaction(SSI)is particularly prominent.SSI refers to the problem of ships interfering with each other due to small gaps between them,affecting ship maneuverability.The harm caused by SSI is significant,mainly reflected in the decline of the ship’s maneuvering ability and an increased risk of collision and grounding accidents,thereby posing a certain threat to navigation safety.Therefore,studying and analyzing SSI has important engineering significance.This study conducted numerical simulation and simulation research on SSI during ship navigation on inland waterways and obtained the following main results:(1)A two-dimensional mathematical flow model was established,and typical river sections were modeled using Mike21 software.The mathematical model was validated using measured flow rate and water level data from typical river sections.(2)Based on the MMG model,we developed numerical simulation programs for ship maneuvering movements in deep and shallow waters using Fortran language programming from the bottom up.The rationality of the simulation results was analyzed through numerical direct navigation experiments,turning experiments and Z-type experiments.(3)On the basis of the above code,we further developed autonomous ship maneuvering numerical simulation programs that considered SSI and simulated the ship trajectory and force under different ship parameters.The study showed that SSI significantly affects ship motion and cannot be ignored.(4)We studied and discussed SSI in non-uniform flow fields using actual natural river channels.By mixing C# and Fortran,we developed the Auto CAD2018 software for visualizing the flow field.We also conducted simulation research on ship maneuvering and navigation under different scenarios with or without considering SSI in non-uniform flow fields.