Sloshing simulations of various types of lng tanks due to ship motions
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Abstract
The major objective of this study is to investigate sloshing behavior in various
types of Liquefied Natural Gas (LNG) tanks due to ship motions. A
commercial Computational Fluid Dynamics (CFD) package, STAR-CCM+, was used to establish
the simulation framework, which was first validated against model test results for wall pressures
in a membrane-type prismatic tank. The CFD model was further applied to four types of non-
prismatic tanks. In addition to the resolved impact pressure peaks, numerical
results demonstrated that the sloshing behavior is unique to each individual tank type.
Numerical results also consistently showed, regardless of the tank type, that the
largest wall pressure tends to occur near the original mean liquid surface, where
structural analysis should be focused, especially for those tanks with internal members
and baffles. The simulation framework developed herein could also be a solid basis for
further analyses, including the
design of new LNG tanks.