Investigation Of Sloshing Affecting Factors In Tank Design

FLNG is the integration of ultra large Floating of collection, processing, liquefaction, storage and unloading on the sea. In December 2013, The ’Prelude’ Floating Liquid Natural Gas launched out from Samsung Heavy Industries dockyards, which open the new chapter of new offshore energy production[1].For the largest market share tank, GTT membrane tank, it is the severe swinging sloshing of liquid in the tank in the extreme sea state that limits the storage tank. So designing large energy ships, its outstanding safety hidden trouble is the impact load on the bulkhead and structural damage caused by sloshing.In this paper, considering about the sloshing physical phenomenon, referring to the current research progress of sloshing, put forward sloshing affecting factors (filling level, main size of tank and shape of the cross section, internal fluid physical properties, excitation of motion), analyzing several important parameters of sloshing affecting factors.There are two ways to definite filling level, the relatively filling height and the depth-to-width ratio. Research shows that:sloshing is more intense in high relatively filling height and low relatively filling height, and depth-to-width ratio is corresponding with sloshing pressure at chamfer and bulkhead. The change of the length, the width and the chamfer is corresponding with sloshing pressure, and they are different at specific scope.Different scale models in free surface position has obvious characteristics boundary, scale effect is a linear rule under the surface, the impact of non-linear above the surface is stonger than that under the surface; In addition to the internal fluid physical density, dynamic viscosity, surface tension of the sensitivity of the hanging load.