The Sloshing Characteristics Research Of The Liquid In Ship Tank

Sloshing in tanks is becoming main interest in tank structure design, especially on the development and application of large liquid carries, such as VLCC,LPG and LNG. Generally speaking, sloshing often occurs when the frequency of ship motion in waves coincides with the inherent vibration frequency of the liquid inside the tanks, when sloshing occurs, sloshing causes violent fluid impacts on tank boundary structure with high pressure, and even damage to the hull structure. Therefore, tank sloshing analysis is a very important research topic in the R & D design of liquid carries.Sloshing is a typical problem of fluid and structure coupling and a very complex phenomenon of flow with a high degree of nonlinearity and randomness. The intensity of sloshing depends on many factors, such as frequency of excitation,compartment geometry,internal components,filling ratio and liquid properties. The main contents of this paper is based on numerical methods of sloshing analysis, and simulate sloshing phenomenon of a model tank by use of MSC.Dytran, and discuss the affect of sloshing due to different forms of the internal tank structure .the main jobs of this paper are as follows:(1)Introduce three basic methods of liquid sloshing analysis, purely theoretical analysis, numerical analysis, experimental methods. Elaborate the principal of numerical analysis from the description of fluid movement and the discrete of control equations and the tracking of free surface.(2)The discussion focus on the principal,steps and related characteristics based on the finite volume method. Simulate and analyze the sloshing of liquid in the tank by use of MSC.Dytran, and achieve the goal of whole liquid sloshing process of numerical simulation, and get the time history graphs of free surface motion and pressure on the ship hull due to fluid impact.(3)Analyze the sloshing load and free surface fluctuation of liquid in the model tank under different filling ratio and compare with relevant experimental results. Draw the conclusion that it is feasible to analyze the liquid sloshing by use of MSC.Dytran.(4)Analyze the energy of liquid sloshing from the energy point of view and point out the principal of suppression sloshing by use of barricade. Analyze the liquid sloshing with or without barricade under the same incentive circumstances and draw the relevant conclusion.