SLOSHING EFFECTS ON THE LONGITUDINAL TANK TYPE C DUE TO MOTIONS OF THE LNG SHIP
Abstract
This paper described the sloshing simulation of the LNG (Liquid Natural Gas) tank due to the LNG ship’s motion during operation at sea. The ship motions in regular wave were obtained by 3D diffraction panel method in frequency domain. Coupled motions of surge, heave, and pitch due to the head sea of incoming wave was considered in the solving of longitudinal sloshing problem in certain range of wave frequency. The sloshing of the LNG Bilobe tank type was simulated using the Computational Fluid Dynamic technique to obtain maximum pressure occurring on inner wall of tank. Three cases of the LNG filling level including an empty condition (10%), a half condition (50%), and a full condition (90%) of tank height were obtained to investigate the free surface effect on circle tank. The results shown the pressure due to sloshing on inner wall increase about 11.1%, 5.4%, and 11.5% of total pressures while in the load conditions of full, a half, and an empty respectively. The result of the probability occurrence calculation shown that the maximum pressure on wall area of the LNG tank for all LNG filling level conditions under 6%.
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