Numerical and Experimental Study on Sloshing Impact Loads in IMO Type-C LNG Tanks with Different Swash Bulkheads

초록

The aims of this study are to determine the ideal configuration of swash bulkhead using 1/50 scaled IMO Type-C LNG tank models to lessen sloshing impact loads and to establish lowest natural frequency of each tank model. Three tank cases with vacuum ring, support ring, and holed plate placed in mid-tank, respectively, were considered and each was simulated by harmonic pitch motions of a more critical amplitude of 6º and various frequencies. The research relates to two-dimensional internal sloshing flows in three geometrically different IMO type-C LNG tank models at 70% filling condition which is 70% of tank height. The viscous two-phase model in STAR-CCM+ with the volume of fluid (VOF) interface was used to solve the sloshing flows in numerical method. While the experimental studies were carried out by other research institute in the same conditional constraints. The impact pressure loads acting on the tank walls against time induced by numerical method were compared with each other in the three tanks. In addition to this, maximum peak pressure RAO (Response amplitude operation) were plotted from numerical and experimental method for providing lowest natural frequency in each tank. The comparative studies indicate that the tank designed with swash bulkhead can reduces the sloshing impact loads, effectively and significantly. © 2021, Springer Nature Singapore Pte Ltd.

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