Study On Numerical Simulation Of Ship Berthing And Departing In Pile Wharf

To meet the international trade demands and the increasing development trend of transportation ship type, the scale of the port becomes larger and the depth of the channel becomes deeper. After totally developed in the natural deep water port of limited self-shield, harbor construction enter the sea area where the wave is higher and the water is deeper step by step. With the increase of the water depth, wind, wave and current are larger in the port basin relatively. Mooring conditions become difficult. It brings a certain influence to ship berthing, departure, entering port and leaving port safely. To analyze the security synthetically and confirm the safe conditions of ship berthing and departing, it is necessary to study the numerical simulation of ship berthing and departing and provide scientific basis to engineering construction and ship maneuverability.Numerical simulation adopts the mathematical model to imitate physical phenomena. It calculates approximate solution by numerical method using computers and replays the course of natural phenomena. Numerical simulation of ocean dynamics regards differential equation as theoretical foundation, and turn differential equation into algebraic equation by dispersing it. Finally, approximate solution is calculated by computers. This paper takes the basic equation of two-dimensional tidal currents as the control equation and disperses it by triangle-grid of local denseness. The control field and its conditions of solution are confirmed. Basic on the existing landform and the large-scale numerical simulation, the two-dimensional tidal currents mathematical model is established by the worst conditions of ship berthing, departure, entering port and leaving port. Generally, there are two kinds of methods in the research field of ship maneuverability. One method is derived from the basic kinematic equation, and the hydrodynamic coefficients in the equation are determined, finally the equation is solved. Presently there are two major genres studying on the ship mathematical model: Global hydrodynamic mathematical model regards the hull, screw and rudder as one rigid body, avoids the interferences between them, and yields quite good results. But it is inconvenient to conduct serial model simulations. Separated hydrodynamic mathematical model considers the hull, screw and rudder subjected to water, respectively. They are combined after fully estimation on the influences between them.Though it has to deal with the complicated response of the ship oar and the rudder, but the physical meaning of each hydrodynamic coefficient is kept, which allows the user to conduct serial numerical simulations conveniently. Another method regards ship as a dynamic system, introduces sports respond model and analyses movements of ship with the control theory. This paper uses the separated hydrodynamic mathematical model in numerical simulation of the ship maneuverability.This paper takes piled wharf of the expansion project in Dongying Port as an example. Referring the hydrodynamic experimental data of the same ship type as designed ship, the hydrodynamic coefficients required in the ship maneuverability are estimated, and the ship maneuverability is calculated in detail. Based on of two-Dimensional current mathematical model, the calculated results are provided as the basic data for the numerical simulation of the ship berthing, departing, entering port and leaving port. It employs the separated hydrodynamic mathematical model and calculates the influences of wind, wave and current, respectively. Safety of ship berthing and departing is verified. Rationality of arrangement of expansion project is testified. Scientific basis is provided to engineering construction, ship maneuverability and related administration department.