Considering The Effect Of Shallow Water Numerical Simulation Of Ship Maneuvering Movement

The currently proposed Yangtze golden waterway strategy has brought unprecedented opportunities for the development of Yangtze River shipping in China. At the same time, with the rapid development of the shipping industry, ship tonnage increases sharply, ship speed improves continually, waterway becomes more crowded, and the ship navigation safety has also drawn more and more attentions. Numerical simulation of ship maneuvering is an effective way to research ship motion parameters and provide ship maneuvering index, and can provide an important basis of decision-making for navigation safety. In recent years, shipping accidents have occurred occasionally in the Yangtze River basin, especially in the mountain river, whose feature of slope steep and urgent flow is an important reason. In addition, the ship maneuvering performance is related to the security and economy of ship navigation. Although the Yangtze golden waterway have been canalized partly and conditions about part of the mountain river channel have improved, the overall shipping situation of mountain rivers is still not optimistic, especially the inconvenience of sailing caused by part of shallow water basin, even traffic accidents on in water. Water transport in Southwestern depends on mountain river mainly, so the research on navigation safety or prediction of ship maneuvering performance of the mountain river(especially the shallow water) has very important practical significance.Based on the essential nature of inland waterways, and two-dimensional flow mathematical model, This article has carried on the numerical simulations of ship maneuvering and simulation research for common inland shallow water area, the main contents are as follows:Firstly, the principle of plane 2-dimensional water mathematical model and discrete method is briefly introduced. Based on the model, the calculation program has been written used by Fortran language. At the same time, the feasibility and accuracy of the flow mathematical model has been verified using the project examples, and the flow field distribution information has been provided for the numerical simulation of ship maneuvering motion.Secondly, on the basis of MMG model, the ship motion equations in numerical simulation of the maneuvering motion under the condition of deep waters have been introduced. The calculating method of hydrodynamic parameters in the equations and the discrete solution of the equations have also been brought out. The simulation platform is built based on model by use the Fortran. Using the real ship hull parameters, the applicability of ship maneuvering model is verified. The typical ship maneuverability test(turning test and z-test) under diffident working conditions provide the basis for ship maneuvering simulation.Thirdly, On the basis of ship maneuvering motion mathematical model in deep water, considering the shallow water effect, the shallow water mathematical model of shallow water mathematical model has been built using the numerical correction method. In this method, parts of hydrodynamic parameters were affected greatly. By using the calculation program written in Fortran, simulation platform is built, which provides strong support for the ship maneuvering test in shallow water and impact analysis in shallow water. Navigation tests in flowing water and still water have been brought out such as Z-test and rotating test, which are used to verify the feasibility of the mathematical model.Lastly, by use the simulation platform combined with real ship data in deep water, shallow water and other conditions, the simulation of waters near the bridge Tengxian with manipulation motion in complex conditions have been carried out. The trajectory of the ship under different working conditions was analyzed, as well as the output data from the simulation platform. The changes of ship parameters in different working conditions reflect by the graphs.