Numerical Simulation Of LNG Tank Sloshing

LNG is the abbreviation of Liquefied Nature Gas. Liquefied natural gas becomes more and more popular as a kind of high calorific power, cheap and clean energy source. The requirement of nature gas had been continuously increasing all over the world. LNG is specially designed and built for the transportation of nature gas with the low temperature of -162℃. It is one of the most significant conveyances in nature gas' international trade. And LNG has the characters of high technology, high risk and high additional value. Recently, with the increasing requirement and trade magnitude, LNG is tending to maximization like container ships. The largest LNG ship has ever been built whose capacity was 266 000 m~3 .Remarkably, sloshing will happen when LNG suffers external load during sailing. But the pressure from impacting loads caused by sloshing makes the liquid temperature rise and induces danger. The risk caused by sloshing becomes more serious as the LNG maximization. In case of an accident, it would take great loss of life and property.In our country, research and development of large LNG has already begun. The analysis of impacting loads caused by sloshing and the prevention of sloshing are the crucial problems needed to be solved in this style of ship development. But the researchers in this aspect are very few. The analysis and study on LNG sloshing in liquid tank are urgently needed to be solved in our country. Therefore, it is very necessary to research on LNG sloshing.In this paper, a Computation Fluid Dynamics analysis software—FLUENT, is used to build a 2D liquid tank hydromechanics model. Solve the sloshing problem with the method of the triangle non-structure grid, Semi-Implicit Method for Pressure-Linked Equations Consistent, VOF model, realizable k -εturbulence model and dynamic grid technology. Under the given ship motion, the paper analyzes the sloshing in the different conditions of loading conditions, movement frequencies, amplitudes and principle dimensions and compares the results at last.