Numerical study on ship motion with LNG tank sloshing

Hasbullah, Nurjannah (2020) Numerical study on ship motion with LNG tank sloshing. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Ship motions excites the LNG tank sloshing in ship cargo when there is a violent sea waves, which causes impact load on tank wall and then influences the ship movement. Focusing on the Open Field Operation and Manipulation (OpenFOAM) development platform of the open source Computational Fluid Dynamics (CFD), numerical calculation of ship motion with tank sloshing is attained and the correlating numerical simulation and verification is performed. For this process, the waves and tank sloshing interactions are fully taken into account. The liquid sloshing motion in membrane tank is firstly simulate through six degrees of freedom motion. Liquid filling levels are set as 25%, 50%, 75% and 90% of the tank’s volume, respectively, in order to find the highest maximum pressure. Then, the simulation is further conducted using baffles in order to control the maximum impact pressure in membrane tank. The key findings are: the impact pressure for 75% filling level of LNG is highest comparing to the other filling levels. The maximum impact of pressure for combinatorial baffles greatly reduced by 28% comparing with the tank with no baffle case.

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